The compensation device structural interference to receivers wideband signals

 

(57) Abstract:

The device relates to the field of radio engineering and can be used in communication systems with broadband signals. The technical result - the suppression of structural (internal) noise at the input of the receivers of the base station of the communication system is a code division multiplexing. In the device at the receiver input has n endenich nodes. Each node is compensation one of the structural interference if its level exceeds the allowable value. The degree of suppression of spurious broadband interference component is greater than in the prototype. 5 Il.

The invention relates to the field of radio and can be used in communication systems with broadband signals.

The known device suppressing structural interference, as described in.with. N 1338078, the patents of the Russian Federation NN 2038697, 2034403, H 04 B 1/10 and others, the lack of which is a low immunity to structural interference.

The closest to the technical nature of the claimed device is on and.with. N 1688416, H 04 B 1/10, a block diagram is shown in Fig. 1, where indicated:

1 - the first multiplier (phase modulator),

2 - generator koi filter,

6 - the first attenuator,

7 - myCitadel,

8 - the first delay element,

9 - second delay element,

10 - bandpass filters

11 - keys,

12 - second attenuators,

13 - the fourth delay elements,

14 - detectors narrowband interference,

15 - the third multiplier,

16 - the third delay element,

17 - frequency channels.

The device operates as follows.

Input wideband pseudonoise signal (PSS) and the disturbance is fed to the input of multiplier 1, which are multiplied together with a copy of the PSS, synchronous with the incoming PSS generated in the generator 2. Due to this PSS is folded in narrow-band signal, which is recommended notch filter 4, and the narrowband interference is concentrated in broadband noise, which through the notch filter 4, the clip of her band F (where F is the band collapsed useful signal) is supplied to the multiplier 3. In the multiplier 3 broadband disturbance is multiplied by the synchronous her a copy of the PSS supplied to it from the output of the generator 2 through 8, ensuring alignment delays in the path of the spread of broadband interference and copies of PSS.

By multiplication with a copy of the PSS brimmed the 17 analog narrowband interference is filtered in partial-band bandpass filter 10, equal

< / BR>
where fW- band PSS, then served on a key 11, which is opened only if the detector 14 decided to detection of interference in this partial channel. Hindrance held the key 11 through the attenuator 12 and the delay element 13 is supplied to one of inputs of vicites 7, which compensate for the interference received at the other input vicites 7 from the input device through the attenuator 6 and the element 9. Items 9, 13 and attenuators 6 and 12 aligns the amplitude and time of the interference received at different input vicites 7. Since one input of vicites 7 receives a broadband signal and narrowband interference, and on the other only the narrowband interference, the interference is compensated, and a broadband signal passes to the output of vicites 7. After multiplication in the multiplier 15 with a copy of the PSS, coming from the output of the generator 2 through the element 16, the broadband signal "folds" in the narrow-band signal, which is filtered in the output filter 5, and then supplied to the output device. The delay element 16 is selected in such a way as to ensure the synchronicity of the broadband signal, and copies of the PSS at the inputs of the multiplier 15.

Will krupnim structural diagram of the device is IG.1),

2, 4 - multiplier products (phase manipulators),

3 - rejection filter,

5 - delay element,

6 - attenuator,

7 - myCitadel,

8 - unit frequency selection interference (n-channel blocks 10 to 14 of Fig.1),

9 - delay element.

The disadvantage of the prototype is a low immunity to structural (internal) noise.

To address this shortcoming in the device containing the receiver useful broadband signal and the channel containing the serially connected first delay element, the first attenuator, myCitadel, and the first multiplier, a first input which is combined with the input of the first delay element, the first band-pass filter, a second multiplier, a second input connected to the output of the second delay element and the output to the input of the second bandpass filter, entered the fifth delay element and (n-1) channels, each of which is entered serially connected receiver interfering signal, the control unit, the second input is connected with the second output of the receiver interfering signal, a switch connected in series to the fourth delay element, the second attenuator, the output of which is connected to the first input of the switch, veroica interfering signal through the third delay element is connected with the second input of the first multiplier and the input of the second delay element, the output of the first multiplier connected to the input of the first bandpass filter, the output of which is connected to the first input of the second multiplier, the output of the second bandpass filter connected to a second input of myCitadel, the input of the fourth delay element is combined with the input of the first delay element and an input channel, the input device is the input of the fifth delay element, the output of which is connected to the input of the first channel.

Structural diagram of the device shown in Fig. 3, where indicated:

1 - receiver signal,

2,4 - first and second multiplier products,

3, 16, the first and second bandpass filters

5, 11, 12, 13, 14 - the first, second, third, fourth, fifth delay elements,

6, 15 - attenuator,

7 - myCitadel,

8 - switch

9 - receiver interference signal,

10 - control unit.

The proposed device has connected in series to the fifth delay element 14, the inlet of which is the input of the n channels and the receiver desired signal 1. Each channel includes serially connected first multiplier 2, the first band-pass filter 3, a second multiplier, a second band-pass filter 16, myCitadel 7, lane is. Ihad transmitter 7 is connected with the second input of the switch 8, the first input connected to series-connected fourth delay element 13 and the second attenuator 15. The inputs of the first delay element 5, the fourth delay element 13 and the first input of the first multiplier 2 are combined and the entrance channel. The control input of switch 8 is connected to the output of the control unit 10, the first and the second input of which is connected to the first and second receiver output interfering signal 9, the third output of which through the third delay element 12 is connected with the second input of the first multiplier 2, and through the third 12 and 11 second delay elements with the second input of the second multiplier 4.

The output of switch 8 is the channel output. The input of the first channel through the fifth delay element 14 is connected to the input device. The output of the n-th channel is connected to the receiver input signal 1.

The device operates as follows.

The inventive device is intended to suppress structural (internal) noise at the input of the receivers of the base station of the communication system is a code division multiplexing. The system includes a base station and N subscriber stations, which may nahoditsya base station, receiving signals from remote subscribers. The system subscribers use broadband photomanipulation signals, differing in structure modeling sequences and have the same carrier frequency f0and spectrum band fW.

Since the base station has N receivers from subscribers in the system, it has information about what the receivers included in synchronism with its subscribers. It is also possible to measure the levels of the signals received by the base station, and determine the degree of mixing of the signal of each of the subscribers of the system to other receivers.

The input mixture through serially connected delay element 14 and n = N - 1 identical channels (nodes) arrives at the receiver input signal 1. In each channel the input mixture is supplied to the first input of vicites 7 through serially connected delay element 5 and the attenuator 6, and to the second input of vicites 7 input mixture flows through the serially connected multiplier 2, the bandpass filter 3, a multiplier 4, the bandpass filter 16. In the multiplier 2 is first convolution noise due to the multiplication of the input mixed with a reference signal. As a reference the La 9, applied to the reference input of the multiplier 2 through the delay element 12. On the reference input of the multiplier 4 the reference signal is fed from the output of the receiver interfering signal 9 through the delay elements 12 and 11. By choosing the values of the delay elements 11, 12, 13 provides the timing reference signal (copies of the interfering signal from the first subscriber) with interfering signal from the first subscriber in the input mixture. The result of the convolution is filtered by bandpass filter 3, and then by multiplying with the same reference signal in the multiplier 4 at its output generates a first broadband structural hindrance, purified from other structural noise and useful signal. The reference signal is fed to the reference input of the multiplier 4 through delay element 11, the amount of delay which is equal to the delay of a bandpass filter 3. From the output of block 4 of broadband structural hindrance is supplied to the bandpass filter 16, amplitude-frequency characteristic which is selected similar amplitude-frequency response of the transmitter of the respective subscriber stations. This is done to more effectively compensate for structural interference in myCitadel 7.

From the output of vicites 7 input mixture, from which are excluded the first End delay 13 and the attenuator 15, which is similar to the blocks 5 and 6. The switch 8 is controlled by commands generated by the control unit 10. The control unit 10 from the output of the receiver interfering signal 7 the team goes on the presence or absence of its synchronization with the signal corresponding to the subscriber and the excess (or does not exceed) there is a valid signal level, which is determined by the degree of mixing it with another receiver. In the presence of synchronization with the signal transmitter of its subscriber and exceeding the adopted signal valid values for the control unit 10 form the command "1", which connects to the output of the switch 8 output vicites 7. In the absence of synchronization, and if the received signal does not exceed the threshold value at the output of the control unit 10 is formed team, "0", which connects to the output of the switch 8, the output of the attenuator 15. In this case, the input mixture passes through this node transit, in both cases, the delay and the coefficient of transmission paths passing through the input mix chosen equal to that achieved by choosing the parameters of the blocks 13, 15, 5, 6 and the gear ratio multiplier products 2 and 4. This is done in order to enable or disable path compensation had no effect NSIH signals 9 shown in Fig. 4, which shows a typical receiver broadband phase-shift keyed signals:

41 - multiplier,

42 - bandpass filter,

43 - demodulator,

44 - device synchronization

45 - generator of pseudorandom sequences.

The output of a pseudorandom sequence generator 45 of the receiver 9 through the delay element 12 is fed to the reference inputs of the multiplier products 2 and 4.

The output signal of the synchronization device, the clock generator SRP 45, and the output of the band pass filter 42 is fed to the control unit 10.

Block diagram of the control unit shown in Fig.5, where indicated:

51 - amplifier

52 - detector

53 - unit comparison with a threshold,

54 - item "AND",

55 - delay element.

The voltage output from the bandpass filter 42 unit 9 is amplified by the amplifier 51, is detected by detector 52, is compared with a fixed threshold Comparer 53. The team of the excess (or does not exceed) the threshold ("1" or "0") fed to the input element And 54, which generates a command "1" with "1" at both inputs. The block 55 is adjustable and allows simultaneous occurrence of the command on the input element And 54.

The delay unit 13 is selected with consideration of the time spent on the formation of teams in the receiver 9 and the control unit 10.

The amount of delay of the delay element 12 compensates for the variation in equipment of various nodes.

In the prototype the powerful structural interference leads to the unlocking of all the frequency channels, and structural interference compensated myCitadel, and the input of the receiver passes the signal and the parasitic component of the evaluation of structural interference, the appearance of which is due to rejection of the spectrum of structural interference notch filter. This parasitic component correlated with the useful broadband signal and further processing is not separated from him. A similar situation occurs when the effect of multiple interference.

The suppression ratio of the parasitic component of the evaluation of the structural interference of the prototype is determined by the ratio

< / BR>
where FRF- band rejectee notch filter, which in the prototype is determined by the information bandwidth of the useful signal (Finfo); B - base broadband signal.

Voltage of the parasitic component of the interference at the output of vicites 7 is defined

< / BR>
Please rate the level of spurious part of the I reference pseudo-random sequence interference, due to what its range is expanding. Part of the extended spectrum of the signal filtered by the filter 3, is manipulated reference pseudo-random sequence interference in the multiplier 4, resulting in the output of block 4 is formed of spurious interfering component, due to the useful signal.

The voltage will be determined by the ratio

< / BR>
Since UTSW<< UPVCthen from the comparison of (1) and (2) shows that UPZ<< UCPD.

The compensation device structural interference to receivers wideband signals containing the receiver desired signal and one channel containing the serially connected first delay element, the first attenuator, myCitadel, and the first multiplier, one input of which is combined with the input of the first delay element, the first band-pass filter, a second multiplier, a reference input connected to the output of the second delay element, the input of which is connected to the reference input of the first multiplier, characterized in that the input of the fifth delay element and n - 1 serially connected additional channels, in each of n channels connected in series introduced the fourth delay element, second atten is that the inputs of the control unit, the output of which is connected with the control input of the switch, the output of which is the channel output, the third output of the receiver interfering signal through the third delay element is connected with the control input of the first multiplier, introduced the second band-pass filter, whose input is connected to the output of the second multiplier and the output to the corresponding input of myCitadel, the output of which is connected to the input of the switch, while the output of the first multiplier through the first bandpass filter connected to the input of the second multiplier, in addition, the input device through the fifth delay element is connected to the combined inputs of the first and fourth delay elements, exit last channel is connected to the receiver input signal.

 

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