Scheme for determining a power of a received signal in mobile communication system

 

(57) Abstract:

Scheme for determining the received signal strength for the receiver of the mobile communication system includes a processor, a first intermediate frequency for processing a high frequency signal transmitted through air path in the zone of the first intermediate frequency to receive the signal of the first intermediate frequency, the processor of the second intermediate frequency signal processing the first intermediate frequency in the zone of the second intermediate frequency to receive the signal of the second intermediate frequency, a first channel associated with the processor output a second intermediate frequency for channel formation for the current corresponding to the signal strength of the second intermediate frequency and the second channel for the formation of an additional channel current. The technical result - the expansion of the dynamic range. 3 C. and 10 C.p. f-crystals, 5 Il.

The present invention relates to a receiver in a mobile communication system, in particular to determine the power of the received signal, which allows to increase the dynamic range of the received signal strength and to minimize fluctuations in the voltage detection, the corresponding power of the received signal is Ohm antenna. The indicator of received signal strength ("RSSI") is used to control the output level of the transmission signal, to set the lowest value and highest value during installation, connection, to perform the function of transmission control, and so on, which means that it is the element that can guarantee peace of mind mobile systems.

The General scheme of the receiver mobile communication system, which performs the above operation shown in Fig. 1. High-frequency signal received from the communication channel through the antenna 110, is transmitted to the amplifier 130 with a low level of noise through the circulator 120. The amplifier 130 amplifies at low noise high-frequency signal supplied via the circulator 120 and the first mixer 150 mixes the high frequency signal amplified at low noise with a frequency signal, which is generated by the first local oscillator 140, and outputs the resulting signal. This signal is a signal zone intermediate frequency. The intermediate frequency amplifier 160 amplifies the signal in the area of the intermediate frequency and transmits it to the processor IF 170. Processor IF 170 receives the signal from the intermediate frequency amplifier 160, and performs various the transformation of the mixer, the second generator, the second IF amplifier, limiter, quadrature detector, audio amplifier, voltage regulator, logarithmic amplifier, etc., and performs various transformations in the area of the intermediate frequency. As processor IF 170 is commonly used integrated circuit IF the frequency modulation type SA606 manufactured by Philips in the Netherlands.

In the diagram (Fig. 2) is shown as connected to the processor IF 170 containing a known schema definition RSSI, with neighboring circuits. Their design and operation are disclosed in the Handbook of the firm t Phillips pages 355-364, 1993, "high-frequency Semiconductor products for Philips communication". In Fig. 2 shows only those elements of the internal structure SA606 that make up the schema definition RSSI.

Processor IF 170 has a high-frequency input and receives the signal amplified by the intermediate frequency amplifier 160. The amplitude of the signal is limited by the limiter to a certain extent and is served on the non-inverting input (+) of the logarithmic amplifier 175 to determine the RSSI.

The input of the logarithmic amplifier 175 is connected with the output of the RSSI processor IF 170, and the inverting input (-) connected to the output RSSI F/B processor IF 170. The capacitor C1, p/B and the ground terminal, and the resistor RI connected between the output RSSI and RSSI output F/B, placed next to determine RSSI.

The definition of RSSI is possible by determining the voltage Vaarising on RSSI output processor IF 170. That is, as soon as the magnitude of voltage Vacan be determined and RSSI in accordance with the schedule according to the level of a high frequency signal from the voltage RSSI (Fig. 3). However, in Fig. 3 there is an interval in which the voltage Vachanges as changes in the level of a high frequency signal, and the interval in which the voltage Vadoes not change even when you change the level of a high frequency signal. The last range is called the dynamic range RSSI. When high-frequency signal corresponding to the level of this interval, is transmitted to the processor 170 IF, on the basis of the voltage Vaperhaps the definition of RSSI. However, if the high frequency signal corresponding to the last interval, called the saturation interval RSSI, is supplied to the processor 170 IF, it becomes difficult to identify RSSI based on the value of the voltage Va. This is due to the fact that if the detected voltage Vaapproximately 3.75 valiu, -30 dBm to 20 dBm, or - 110 dBm. Finally, the dynamic range of the RSSI processor IF (Fig. 2) is limited to a constant limit (range from -30 dBm to - 110 dBm as shown in Fig. 3). Therefore, for a known receiver of a mobile communication system, the received signal can be determined only when the processor IF fed a high-frequency signal from -30 dBm to - 110 dBm.

The known mobile communication system is designed in such a way as to have the low-level transmit output to minimize noise and high gain elements such as a circulator, LNA (low noise amplifier), a mixer, IF amplifier, etc. located at the entrance of the processor IF to improve the receive sensitivity. For example, in the case of the second generation system, a cordless telephone (CT-2), was designed to gain circulator was -1 dB gain LNA +20 dB, the gain of the mixer +6 dB, and the gain of the IF amplifier +5 dB (i.e., the gain of the input processor IF was equal to about 30 dB). However, the gain of the input processor IF need be determined with respect to the dynamic range of the RSSI acceptable to the processor IF not arbitrarily, without caissara IF the smaller the range of the high frequency signal, which can be determined by the processor IF. For example, when the gain of the input processor IF is set to 30 dB, the definition of RSSI becomes possible only when the range of the high frequency signal transmitted from the transmitter in less than -60 dB.

On the other hand, it is necessary to consider that the stable range of the high frequency signal received by the antenna shall not exceed - 90 dBm, given the phenomenon of Rayleigh fading and thermal noise of the receiver, which are noticeable for mobile systems, constructed in accordance with microadenomas concept of how the system ST-2.

Therefore, considering the above, the dynamic range of the RSSI, which may be accepted by the antenna without saturation processor IF is about 25 dB ( -60 dBm to -90 dBm ). You may notice that the dynamic range of the RSSI receiver for known mobile systems is very narrow. Accordingly decreases the number of objects on the output that can be controlled by the receiver, and because of the presence of unmanaged transmitting output in the high frequency signal is distorted, which means ultimately decrease the quality of the s and the maximum value, which can be successfully used to establish communication with the narrowing of the dynamic range of the RSSI.

The aim of the present invention is to provide a mobile communications, in which there is a scheme for extending the dynamic range of the RSSI.

Another objective of the present invention is the creation of a system of mobile communications with the schema definition RSSI to extend the control range of the transmitting output.

Another objective of the present invention is to provide a schema definition RSSI to minimize signal interference in the high frequency signal received by the receiver mobile systems.

Another objective of the present invention is to provide a schema definition RSSI for improving communication quality in a mobile communication system.

Another objective of the present invention is to provide a schema definition RSSI to extend the specified range of the minimum and maximum values for successful communication in the mobile communication system.

Another objective of the present invention is to provide a schema definition RSSI for free installation of the gain input of the processor, IF the mobile link to the reality of the receiving mobile systems.

These and other objectives can be achieved through the definition schema RSSI, constructed according to the invention, which includes a current amplification, optionally associated with the RSSI output F/B processor IF and variable resistor optionally included between the output of the RSSI and RSSI output F/B.

In accordance with the first aspect of the present invention, a scheme for determining the received signal strength for the receiver of the mobile communication system includes a processor, a first intermediate frequency for processing the high frequency signal transmitted over the air tract in the area of the first intermediate frequency to receive the signal of the first intermediate frequency, the processor of the second intermediate frequency signal processing the first intermediate frequency in the second frequency zone for receiving the signal of the second intermediate frequency, a first channel associated with the processor output a second intermediate frequency for forming a path for the current corresponding to the signal strength of the second intermediate frequency and the second channel to create an additional channel for current, flowing through the first channel, in response to generation of the signal, the first intermediate frequency.

The first channel of the processor of the second intermediate frequency and the earth. The second channel connects the processor output the first intermediate frequency to the first channel and includes a transistor, the base of which is connected to the processor output the first intermediate frequency, a collector connected to the connection point of the first and second resistors, and an emitter grounded.

In accordance with the second aspect of the present invention, a scheme for determining the received signal strength for the mobile communication system includes a processor, a first intermediate frequency for processing a high frequency signal transmitted through air path in the zone of the first intermediate frequency signal of the first intermediate frequency, the processor of the second intermediate frequency signal processing the first intermediate frequency in the zone of the second intermediate frequency signal of the second intermediate frequency, channel power associated with the processor output a second intermediate frequency for channel formation for the current corresponding to the signal strength of the second intermediate frequency, and a gain circuit current for current amplification, flowing through the channel current when detecting any signal, the first intermediate frequency.

The channel current contains more than one resistor frequency and earth. Circuit current amplification connects the processor output the first intermediate frequency to the first channel in response to the generated signal, the first intermediate frequency so that the amount of current flowing through the channel current increases with the signal level of the first intermediate frequency. The gain circuit current contains a transistor, the base output of which is connected with the processor output the first intermediate frequency, the collector is connected with the connection point of the first resistor and the second resistor, and the emitter is grounded.

In accordance with a third aspect of the present invention, a scheme for determining the received signal strength for the receiver of the mobile communication system includes a processor, a first intermediate frequency for processing a high frequency signal transmitted through air path in the zone of the first intermediate frequency signal of the first intermediate frequency, the processor of the second intermediate frequency signal processing the first intermediate frequency in the second frequency zone for receiving the signal of the second intermediate frequency, the channel current, is connected between the output of the processor of the second intermediate frequency and the ground to form a channel for current, relevant is ocessor second intermediate frequency and the channel current to control the amount of current in accordance with the signal strength of the second intermediate frequency.

The channel current includes a first resistor and a second resistor connected in series and connected between the output of the processor of the second intermediate frequency and the earth. Element to change the current contains a variable resistor connected between the output of the processor of the second intermediate frequency and the channel current.

The invention is further explained in the description of specific variants of its embodiment with reference to the accompanying drawings, in which Fig. 1 depicts a diagram of a known receiver of the mobile communication system; Fig. 2 depicts a known scheme of determining a power of a received signal; Fig. 3 depicts a graph of the voltage of the power indicator of the received signal, a certain well-known scheme determine the power of the received signal, depending on the power of a received signal; Fig. 4 depicts a scheme of determining the power of a received signal according to the invention; Fig. 5 depicts a graph of the voltage of the power indicator of the received signal, a specific scheme determine the power of the received signal, depending on the power of a received signal according to the invention.

According to the first aspect of the invention, the detection circuit RSSI receiver system p is given by the air path in the zone of the first intermediate frequency and the signal of the first intermediate frequency; the processor of the second intermediate frequency signal processing the first intermediate frequency in the zone of the second intermediate frequency and the signal of the second intermediate frequency; a first channel that is associated with the processor output a second intermediate frequency and provides the channel for the current corresponding to the signal strength of the second intermediate frequency; and a second channel which provides the channel in response to the generated signal of the second intermediate frequency for additional current to the current flowing through the first channel current.

Above the first channel is formed from more than one resistor connected between the output of the processor of the second intermediate frequency and ground. Can be used multiple series-connected variable resistors, the first resistor and the second resistor.

Second, the channel responds to the signal, the first intermediate frequency and connects the output of the processor of the first intermediate frequency to the first channel. It may be a transistor, the base output of which is connected to the processor output the first intermediate frequency, the collector of which is connected with the connection point of the first resistor and the second resistor, and the emitter is connected to ground.

The channel current is composed of more than one resistor connected between the output of the processor of the second intermediate frequency and the output ground. Can be connected in series variable resistors, the first resistor and the second resistor.

The channel current amplification responds to the first intermediate frequency signal and connects the output of the processor of the first intermediate frequency to the first channel. It differs in that the higher the signal level of the first intermediate frequency, the greater the value is, outinen with the processor output the first intermediate frequency, the collector is connected with the connection point of the first and second resistor, and an emitter connected to the ground.

In accordance with a third aspect of the invention, the detection circuit RSSI receiver of the mobile communication system includes a processor, a first intermediate frequency, which handles high-frequency signal transmitted over the communication channel in the zone of the first intermediate frequency and outputs a first intermediate frequency; a processor of the second intermediate frequency, which processes the signal of the first intermediate frequency in the zone of the second intermediate frequency and outputs a second intermediate frequency; a channel current, which is included between the output of the processor of the second intermediate frequency and the grounding terminal, and provides the channel for the current corresponding to the signal strength of the second intermediate frequency; and the element of change of current, which is included between the output of the processor of the second intermediate frequency and the channel current and controls the amount of current corresponding to the signal strength of the second intermediate frequency.

As mentioned above, the channel current is composed of the first resistor and the second resistor, which are connected in series between the output of the second intermediate processor is a processor output a second intermediate frequency and the channel current.

The preferred embodiment of the present invention are described below.

The terms are defined considering functions in the present invention and their values can be changed in accordance with the intentions of the user, the designer of chips or customer, but they should be determined on the basis of a complete description of the present invention.

As mentioned above, the CPU IF 170 (Fig. 4) can be used FM IF IC (RF integrated circuit IF) type SA606 produced by Philips. Among the internal components of the IC devices shown only the schema of the logarithmic amplifier 175, which is the schema definition of RSSI.

On the high-frequency input processor 170 IF in a particular zone intermediate frequency processed high-frequency signal received by the antenna 110 (Fig. 1) and transmitted to the processor IF (Fig. 1), which generates the signal, the first intermediate frequency. The amplifier 130 low noise (Fig. 1) the first local oscillator 140, the first mixer 150, and the first amplifier intermediate frequency 160 comprise a processor IF the receiver mobile systems. Between the output of the RSSI processor 170 and IF the ground lead is connected in series connected variable resistor R is d RSSI F/B, i.e., the non-inverting output (-) logarithmic amplifier 175, and the collector of the transistor TR1.

Between the emitter of the transistor TR1 and ground parallel to the capacitor C3 and the resistor R4. To the base terminal of the transistor TR1 is connected to the same output of the transistor TR2 through the resistor R5 and the capacitance C2 and the resistor R3 connected in series. One of the conclusions of the resistor R3 is connected to the first processor IF together with high-frequency input of the processor IF 170. The emitter of transistor TR2 is connected to ground and the collector is connected with the output of the power supply Vccprocessor IF 170 through resistor R6. The transistor TR1 is a DC amplifier working mode, and the transistor TR2 compensates for the fluctuation of the DC.

It is expected that after receiving antenna 110 high-frequency signal transmitted over the communication channel (Fig. 1), the first processor handles the received high-frequency signal in the zone of the intermediate frequency and transmits the signal of the intermediate frequency. The intermediate frequency signal transmitted from the first processor IF served on the high frequency output of the processor IF 170 (Fig. 2), which is the second processor IF. Then, the controller 170 IF o is such as a second mixer, a second local oscillator, the amplifier of the second intermediate frequency, limiter, quadrature detector, audio amplifier, voltage regulator, and a logarithmic amplifier. At this time, a non-inverting output (+) of the logarithmic amplifier 175 is supplied to the intermediate frequency signal processed by the limiter. Logarithmic amplifier 175 supplies the RSSI output current corresponding to the received signal strength of the intermediate frequency. The current applied to the RSSI output, flows through the path consisting of the variable resistor Rt, a resistor R1 and a resistor R2 connected in series.

The intermediate frequency signal transmitted from the first processor IF served on a base of the output transistor TRI and the transistor TR2 through the resistor R3 and the capacitance C2. The resistor R3 and the capacitance C2 perform some function signal detection. This is due to the fact that none of the signals are not fed to the base of the output transistor TR1 and the transistor TR2, if the intermediate frequency signal is not transmitted from the first IF processor. The transistor TR1 and the transistor TR2 is switched on by a signal of intermediate frequency, which is supplied via a capacitance C2. In the enable transistor TR, through a resistor R4 connected to the emitter of the transistor TR1, the current flows, the voltage Vwithattached to base the conclusion. This way, there is another current passing through the resistor R1 and the resistor R4.

In the scheme according to the invention, when the antenna is made of a high-frequency signal, the current is passed from the output of the logarithmic amplifier 175 and the corresponding power signal passes through the channel, consisting of a variable resistor Rt, a resistor R1, and resistor R4. The amount of current and voltage RSSI in the schema definition RSSI of the present invention is shown in the following equations (1)

Ia=(VaVb)/(Rt+R1)

Ib=Vb/R2

Ic=Vc/R4

Ia=Ib=Ic< / BR>
Va= Ia(Rt+R1)+Vb= (Ib+Ic)(Rt+R1)+IbR2= Ib(Rt+R1+R2)+Ic(Rt+R1) ... (1)

where Iacurrent representing a power of a received signal transmitted from the output of the logarithmic amplifier 175, which passes through the resistor Rt and the resistor R1; Ibthe current passing through the resistor R2; Icthe current passing through the resistor R4; Vathe voltage corresponding to the power of the received signal, shown at the output of the group of applied to both terminals of the resistor R4.

The magnitude of the current and voltage RSSI in a known schema definition RSSI is defined by equations (2)

Ia=(Va-Vb)/R1

Ib=Vb/R2

Ia=Ib< / BR>
Va=IaR1+Vb= IbR1+IbR2=Ib(R1+R2) ... (2)

From equations (1) and (2) shows that the detection circuit RSSI according to the invention has the additional current Ic. This additional current allows you to extend the dynamic range of the RSSI circuit determine the RSSI of the present invention. This is due to the fact that when the intermediate frequency signal is supplied from the first processor IF the receiver, the level of this intermediate frequency signal is determined by the resistor R3 and the capacitance C2, the intermediate frequency signal is fed to the base of the output transistor TR1 and increases the current Ic. Increased current Icin the end, increases the level of the input signal processor 170 IF.

The expansion of the dynamic range RSSI increasing the amount of current flowing through the output RSSI processor 170 IF confirmed by the reference "Data communication devices of Motorola", page 2-78 for 2-80, which describes the schema type MS and MS that are at Motorola.

When using IP SA606 processor 170 IF the schema definition RSSI in accordance with the present invention operates as follows.

If the RF input of the processor IF 170 (Fig. 4) signal, a value of 0 dBm, with the base of the output transistor TR1 is on, the transistor TR2 is supplied a voltage greater than 0.6 volts, resulting in a collector current passes approximately 13 microamps. The RSSI voltage in this case is in the dynamic range RSSI, (Fig. 5). If served in small, less than -30 dBm, the signal, from the base of the output transistor TR1 to TR 2 voltage is equal to only 0.6 volts, and therefore, through the collector current flows equal to 5 microamperes. The RSSI voltage in this case is also in dynamic range RSSI, (Fig. 5).

However, if the signal level is low, the signal-to-noise ratio distortion (SINAD) of the receiver can be worse in comparison with communication AC. Therefore, it is necessary to select the value of resistor R3, which is used to configure the connection to AC for the received signal. That is, if the received signal level is high, the value of resistor R3 must be chosen in such a way as to ensure sufficient lineanother Rt is included between the output of the RSSI processor IF 170 and resistor R1. This additional variable resistor Rt is used to obtain the maximum SINAD. Another reason to use an additional variable resistor Rt is the need to maintain a constant output voltage RSSI at a constant level signal. This means that if the resistance value of the variable resistor Rt is adjusted accordingly, the output voltage of the RSSI can be kept constant, so as minimizing the deviation of the RSSI. For definition schema RSSI of the present invention, the dynamic range RSSI without breaking the receive sensitivity is between 0 dBm and -80 dBm, and the dynamic range of the RSSI of the received signal from the antenna is in the range from -30 dBm to -90 dBm. These dynamic ranges can be successfully used for system ST-2.

As mentioned previously, the present invention is characterized by the fact that there is another channel for passing the current in addition to the existing schema definitions RSSI. So there is some advantage in that the gain of the first processor IF (output RF IP-IF) can be designed more freely and thus may improve sensitivity is e advantage namely, that the range of voltages which can be manipulated by the transmitter, can be expanded by expanding the dynamic range of the RSSI. Another advantage is that the minimum value and maximum value used to establish communication, can be reconciled with the established range.

1. Scheme for determining the received signal strength for the receiver of the mobile communication system containing a processor of the first intermediate frequency for processing a high frequency signal transmitted through air path in the zone of the first intermediate frequency to receive the signal of the first intermediate frequency, the processor of the second intermediate frequency, designed for signal processing the first intermediate frequency in the zone of the second intermediate frequency to receive the signal of the second intermediate frequency, coupled to the processor, the first intermediate frequency, a first channel associated with the processor output a second intermediate frequency to obtain the channel for the current corresponding to the signal strength of the second intermediate frequency, connected in series capacitor and two resistors, moreover, the capacitor and one resistor is grounded, wherein the first and intermediate frequency, associated with the processors of the first and second intermediate frequencies, and also for connection of the processor output the first intermediate frequency and a connection point of the first resistor and the second resistor in response to the generated signal, the first intermediate frequency.

2. The diagram on p. 1, wherein the first channel includes a first resistor and a second resistor connected in series and connected between the other output of the processor of the second intermediate frequency and the earth.

3. The diagram on p. 2, wherein the first channel further comprises a variable resistor connected in series with the first resistor and the second resistor.

4. The diagram on p. 1, wherein the second channel includes a transistor, the base output of which is connected to the processor output the first intermediate frequency, the collector is connected with the connection point of the first resistor and the second resistor, and an emitter connected to the ground.

5. Scheme for determining the received signal strength for the receiver of the mobile communication system containing a processor of the first intermediate frequency for processing a high frequency signal transmitted through air path in the zone of the first intermediate frequency to obtain a signal is filling frequency in the zone of the second intermediate frequency to receive the signal of the second intermediate frequency, coupled to the processor, the first intermediate frequency, means for detecting signal of a second intermediate frequency, the channel current associated with the output processor of the second intermediate frequency and is intended for formation of the channel for the current corresponding to the signal strength of the second intermediate frequency, is connected to another output of the processor of the second intermediate frequency, characterized in that it contains the schema of the current amplification to increase the current flowing through the channel current when detecting any signal, the first intermediate frequency, connected to the processor, the first intermediate frequency and the processor of the second intermediate frequency.

6. The diagram on p. 5, characterized in that the circuit current amplification is designed to increase the amount of current flowing through the channel current by increasing the signal level of the first intermediate frequency.

7. The diagram on p. 1, wherein the channel includes serially connected first and second resistor connected between another output of the processor of the second intermediate frequency and the earth.

8. The diagram on p. 7, characterized in that the channel current further comprises a variable resistor connected in series with the first RSI output processor of the first intermediate frequency with the connection point of the first resistor and the second resistor in response to the generated signal, the first intermediate frequency.

10. The diagram on p. 9, characterized in that the channel current contains a transistor, the base output of which is connected with the processor output the first intermediate frequency, the collector is connected with the connection point of the first resistor and the second resistor, and an emitter connected to the ground.

11. Scheme for determining the received signal strength for the receiver of the mobile communication system containing a processor of the first intermediate frequency for processing a high frequency signal transmitted through air path in the zone of the first intermediate frequency to receive the signal of the first intermediate frequency, the processor of the second intermediate frequency signal processing the first intermediate frequency in the zone of the second intermediate frequency to receive the signal of the second intermediate frequency, coupled to the processor, the first intermediate frequency, the channel current, is connected between the output of the processor of the second intermediate frequency and the ground for the formation of the channel for the current corresponding to the signal strength of the second intermediate frequency associated with the processor of the second intermediate frequency, characterized in that it contains the element of change of current is connected between the output of the processor of the second intermediate frequency and the channel current is

12. The diagram on p. 11, characterized in that the channel current includes a first resistor and a second resistor connected in series and connected between the output of the processor of the second intermediate frequency and the earth.

13. The diagram on p. 11, characterized in that the element for changing the current contains a variable resistor connected between the output of the processor of the second intermediate frequency and the channel current.

 

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