Method and device for input of adaptive digital pre-distortions for wireless transmitter

FIELD: communications.

SUBSTANCE: method and device realize nonlinear transformation, opposite to characteristic of communication channel, using digital block for input of pre-distortions relatively to input broadband signals. Signals with inputted pre-distortions after passing through conversion channel with increase of frequency are amplified by means of power amplifier. Portion of signals, received at output of power amplifier, is sent back to adaptive controller through connection means. Check communication signals are processed by adaptive controller to produce energy of out-band emission as goal function, parameters of pre-distortions of refreshed by using multi-parameter optimal value search module.

EFFECT: higher efficiency.

2 cl, 4 dwg

 

Link to a related application

In this patent application for the invention claimed priority to international application PCT/CN01/01186, filed July 20, 2001, which claimed priority of the patent application in the Republic of China CN 001194933, filed July 20, 2000; the subject invention which is given here in the references.

The technical field

The present invention relates to various wireless transmitters used in data transmission systems, which allow to improve the characteristics of the linearity of the system. More specifically, the present invention relates to a method and device input adaptive digital pre-emphasis for the wireless transmitter.

The level of technology

In recent years, with significant development of wireless technology worldwide in the industry using wireless data transmission have any number of problems, difficult decision that are associated with the simultaneous operation of various data transmission systems, with a sharp increase in competition between different data transmission standards, with reduced resources channels wireless data transmission, etc. For the solution of these problems is required to convert the signals into digital form in wireless data transmission systems was carried out as close as possible to the RF input interface. In addition, there is a need for the tsya, to the main functional elements of various wireless data transmission systems embodied using software, because it can be supported by other data communication systems by modifying only the software system. Such requirements are necessary in wireless data transmission systems, in particular, it relates to a broadband wireless data transmission systems. In addition, broadband wireless data transmission systems is also required to provide exceptional linearity and wide dynamic range broadband transmission channels.

For more efficient use of frequency resources in many data transmission systems are used modulation methods with high efficiency of use of frequency spectrum, such as SSB (broadcasting communication with the expansion of the range of signals), QPSK (phase shift keying with Quaternary phase signals, 8PSK (phase shift keying with octal phase signals), etc. In these methods, the modulation is the modulation of not only the phase of the carrier frequency, but also its amplitude. Thus, when using these methods of modulation are generated modulated signals with variable envelope with a significant ratio of the peak amplitude to average intensives and signal. Even when using modulation with constant envelope, such as GMCK (Gaussian manipulation with minimal frequency shift), when applied technology multi-frequency carrier, can also be obtained considerable fluctuations of the envelope at the output of the combining signal, which is intended to combine a number of carrier signals in the form of a broadband signal. For broadband transmission channels may be more requirements high linearity with a significant ratio of the peak amplitude to the average intensity of a signal, in particular for digital to analog converters, broadband transmitters (SPP) and broadband amplifiers. Typically, semiconductor devices are bound to have a nonlinear characteristic. As a result of work wideband transmitter in the field of nonlinear characteristics of the formed component mutual modulation, so that the signals interfering with each other within the band of each of the signals.

As described above, in the application of broadband data transmission systems a common requirement is to improve the linearity of the data transmission system. For solving the problem of ensuring linearity to date has used three ways. One of them is to use appropriate swirly anago semiconductor device and the use of such design wideband transmitter, which meets the requirements for performance superlinear semiconductor device. This method is costly and involves the solution of many technological difficulties. The second way is to reduce the capacity of the entire transmission channel, so that the transmission channel was working in the linear region. However, this method significantly reduces the efficiency of broadband data transmission systems. The third way is to use technology linearization, i.e. for its implementation are appropriate peripheral circuit intended for correcting the nonlinearity of the transmission channel, which provide, therefore, the effect of linear amplification of input signals in the entire chain. This method eliminates the use of difficult manufacturing techniques of semiconductor devices and allows you to use devices with relatively low cost. In addition, this method not only allows you to apply a variety of structural forms, but also provides flexibility in the choice of devices. Thus, the third method is considered as the most appropriate method for use in the present time.

For implementing the method of linearization of the most simple and effective is the technology input pre-emphasis. In the person of input pre-emphasis signals initially adjusted using the input device, pre-emphasis, then they are sent to the amplifier for amplification and delivery to the exit. The characteristic distortion of the signal received at the input device pre-emphasis is opposite to the characteristic of the transmission channel, allowing the component distortions of the transmission channel is compensated, so that we obtain an output signal without distortion.

Conventional narrowband system input pre-emphasis is shown in figure 1. Narrowband signals are initially adjusted using the input device pre-emphasis. Then the signals are subjected to quadrature modulation, perform d / a conversion using digital to analog converters, carry out the conversion with increasing frequency upconverter frequencies increase with the use of a power amplifier and, finally, serves on the output antenna. In this part of the signal applied to the amplifier output power is directed back through the connector, is converted into a narrow-band signal passing through the bandpass filter (not shown), carry out the conversion with decreasing frequency in the unit of frequency decrease, hold analog-to-digital conversion by analog-to-digital Converter, demodulator using quadrature demodulator (not shown) and sent to a processor error. Vtoro the signal, supplied to the processor error is an input narrowband signal with a delay. The difference between the two signals are compared in the processor error handling for receiving the signal supplied to the input device pre-emphasis.

The input device settings pre-emphasis is updated. Processor error handling can be implemented adaptive function. However, in wideband data transmission delay of different frequency components of the signals in the transmission channel cannot be approximated to a single value. A comparison of the differences between the input signals and output signals with a simple input delay is unacceptable to solve compensate for the nonlinearity of the transmission channels of broadband data transmission systems. Thus, there is a need for a device and method for input pre-emphasis, designed to compensate for the nonlinearity of the transmission channels of broadband data transmission systems.

Brief description of the invention

One of the purposes of the present invention is to overcome the disadvantages associated with the nonlinearity of the transmission channels in the known wideband data transmission systems. The present invention is directed to a device and method for input of the adaptive pre-emphasis to provide the required compensation nainan the STI transmission channels of the broadband base station.

The present invention uses a multi-parameter optimization module for the adaptive adjustment of the parameters of the pre-emphasis. In the transmitted signals are such predistortion that the characteristic nonlinearity of the nonlinear transmission channels is compensated to suppress out-of-band radiation of the output signals.

In one variation of the embodiment of the present invention, the digital input device adaptive pre-emphasis for wireless transmitter includes a modulator, a digital block input pre-emphasis, the adaptive controller setting pre-emphasis, digital to analog Converter, the boost Converter frequency amplifier, a local oscillator, inverter frequency reduction, analog-to-digital Converter and antenna. Broadband digital signals intended for transmission to, proceed in the digital block input pre-emphasis and processed in the digital block input pre-emphasis to generate signals with the pre-emphasis. The signals introduced by the pre-emphasis is converted into digital to analogue Converter and then the Converter increase frequency, increase the power amplifier and finally passed through the antenna. Simultaneously, the portion of the signals at the output of the power amplifier is transmitted back to the connector to close the feedback at which the feedback signals are received at the adaptive controller setting pre-emphasis through the transducer frequency reduction and analog-to-digital Converter. Then carry out digital processing of the sampled feedback signals using adaptive controller pre-emphasis parameter, for which the energy of the out-of-band radiation of the feedback signal is used as the objective function and regulate the adaptive pre-emphasis settings using multi-parameter optimization in such a way that ensures linear characteristic of the entire transmission channel wideband data transmission systems.

In one variation of the embodiment of the digital input devices adaptive pre-emphasis described above, the adaptive controller setting pre-emphasis module includes estimates of the power spectrum and the module adaptive way. The signals at the output of the analog-to-digital Converter, proceed to the assessment module of the power spectrum to estimate the power spectrum. Then the signals are sent to the module adaptive method for implementing adaptive adjustment before they are submitted to the unit input pre-emphasis.

The present invention is also directed to a method of input of the adaptive digital pre-emphasis for wireless transmitters. This method comprises the following is e stages:

a) performing a nonlinear transformation of the opposite characteristic of the nonlinearity of the transmission channel using a digital input block distortion in relation to the input broadband signal;

b) amplification through amplifier signals introduced by the pre-emphasis after passage through the upconverter frequency;

c) passing through the feedback circuit through the connector in the adaptive controller, part of the signals at the output of the power amplifier;

d) performing digital signal processing using adaptive controller in relation to the feedback signals to generate energy out-of-band radiation feedback signals; and

e) updating the parameters of the distortion by using a multi-parameter search engine optimal values using the energy out-of-band radiation as the target function.

In addition, in one variant embodiment of the above method, the objective function in step (e) includes the step of using the energy of out-of-band radiation feedback signals as the target function of the adaptive optimization of the pre-emphasis parameter.

In yet another variant embodiment of the above method as factors objective function N of parameters of digital block input predis is raised. When the objective function takes the minimum value, the values of the relevant factors are taken as the optimal values of the parameters of the predistortion.

In another variant embodiment of the above method the step of using the multi-parameter module find the optimal value for parameter updates the predistortion stage e) comprises the following steps:

1) selecting, if necessary, N+1 initial points in N dimensions, the coordinates of which are used as the N parameters of the digital input block distortion when these parameters are accepted by the input block distortion, with an appropriate measure of the energy out-of-band radiation of the respective feedback signals;

2) determination of the optimal point, the worst point and the second worst point of N+1 points on the basis of measured values of energy out-of-band radiation;

3) the designation of all points, except the worst point as points of reflection of the worst point;

4) measurement values of the objective function corresponding to each of the reflection points, if the value of the objective function corresponding one of the reflection points, more than the value of the objective function corresponding to the second worst point, the return and the compression of one of the reflection points from the original direction of reflection;

5) determining whether the value of the objective function for compressed to the point of reflection is still great, than the value of the objective function corresponding to the second worst point, and if so, reducing by half the distance between the optimal point and all points, except the optimal point; and

6) go to step 2) for a subsequent adjustment of pre-emphasis settings.

Brief description of drawings

The following is the description of the preferred variants of the embodiment of the present invention with reference to the accompanying drawings, on which:

figure 1 depicts a block diagram of the narrowband input pre-emphasis prior art;

figure 2 - block diagram of a variant of embodiment of the digital input devices adaptive pre-emphasis to the wireless transmitter in accordance with the present invention;

figure 3 is a block diagram of a variant of embodiment of the adaptive controller setting pre-emphasis in accordance with the present invention;

4 is a sequence diagram of operations in accordance with one possible embodiment of the method of adaptive digital pre-emphasis for the wireless transmitter according to the present invention.

A detailed description of the preferred options of the incarnation

Figure 2 shows one embodiment of a digital device, 20-input adaptive pre-emphasis to the wireless transmitter, in accordance with the laws the AI with the present invention, which includes a modulator 21 of the base station transmitter (BST), block 22 input pre-emphasis, the adaptive controller 23 setting pre-emphasis, digital to analog (D/A) Converter 24, an inverter 25 increasing frequency, the amplifier 26 power local oscillator 27, the transmitter 28 of the lower frequency, analog-to-digital (A/D) Converter 29 and the antenna 30. Broadband digital signals at the output of the controller (not shown) for transmission, served on the keypad 22 of the input pre-emphasis. The signals are processed using a digital block 22 input pre-emphasis, and the signals introduced by the pre-emphasis are then fed into d / a Converter 24, an inverter 25 to increase the frequency to be converted. The converted signals are then increase with the use of the amplifier 26 power and transmit via the antenna 30. The input digital pre-emphasis is a process non-linear transformation. In ideal conditions characteristic nonlinearity digital pre-emphasis opposite non-linearity of the transmission channel, due to which output signals and input signals have a linear relationship, which determines the minimum energy out-of-band radiation.

The characteristic nonlinearity of the transmission channel is changed in accordance with the working conditions and environmental parameters. Required the Xia, to the parameters of the digital input block adaptive pre-emphasis has been updated. As shown in figure 2, the portion of the signals at the output of the amplifier 26, passes back through the connector 31 to the input of the adaptive controller 23 of the pre-emphasis parameter through a transformer 28 lower frequency and a/d Converter 29. The feedback signal is processed in digital form via the controller 23, in which the energy of the out-of-band radiation is used as a feedback signal as the target function, and the parameters of the adaptive pre-emphasis regulate through the use of multi-parameter optimization process, thus maintaining the linear transmission characteristics of the entire data transmission channel.

The figure 3 shows the block diagram of a variant of embodiment of the adaptive controller 23 setting pre-emphasis in accordance with the present invention. The controller 23 includes a module 32 estimates of the power spectrum and the adaptive module 33 (a/R). The signals output from the A/d Converter 29 is passed to the module 32 estimates of the power spectrum to estimate the power spectrum. Then the signals are sent to the adaptive module 33 to perform adaptive adjustment before they will be transferred to the digital unit 22 of the input pre-emphasis. Nonlinear transformation of the opposite characteristics of the second transmission channel, by using the keypad 22 of the input pre-emphasis in relation to the input digital signals. Characteristics of digital transmission unit 22 of the input pre-emphasis is determined by the set of parameters of the pre-emphasis {0and1..., andN}. The parameters of the pre-emphasis can be factors specific function or can represent values taken from table entries search (TS (LUT)). The keypad 22 of the input pre-emphasis periodically receives signals update the pre-emphasis parameter sent from the adaptive controller 23 of the pre-emphasis parameter, and accordingly modifies the parameters of the pre-emphasis.

The input method of adaptive digital pre-emphasis to the wireless transmitter in accordance with the present invention includes the following steps:

a) performing a nonlinear transformation, the opposite characteristic of the transmission channel, using a digital input block distortion in relation to the input narrowband signals;

b) amplification of signals with the pre-emphasis amplifier power after conversion in the Converter frequency increase;

c) feeding back to the adaptive controller through the connector part of the signals at the output of the power amplifier;

d) performing digital signal processing through the Yu adaptive controller in relation to the feedback signals to generate energy out-of-band radiation feedback signals; and

e) updating the parameters of the distortion by using a multi-parameter search engine optimal value, in which the energy of the out-of-band radiation is used as the target function. The objective function represents the energy use of out-of-band radiation feedback signals as the target function of the process of adaptive optimization of the pre-emphasis parameter.

Figure 4 shows a diagram of the sequence of operations of one of the variants of embodiment of the input method of adaptive digital pre-emphasis to the wireless transmitter in accordance with the present invention. The input method of adaptive digital pre-emphasis enables the adjustment of the setting of pre-emphasis or iterative process that searches for the optimal values of the parameters of the pre-emphasis. As an example, assume that the digital block 23 input pre-emphasis has N+1 parameters, which are denoted as {0, a1..., andN}and N+1 values of parameters can be considered as coordinates of a point X in N+1 dimensions. Energy out-of-band radiation of the feedback signals is considered as the objective function iteration, and the aim of the process of adaptive optimization parameter pre-emphasis is to obtain the optimal values of the parameters predischarge the th { 0and1..., andN}that allow you to obtain the minimum value of the target function.

The process of adaptive adjustment or iteration of the pre-emphasis parameter includes the following steps:

1) select N+1 initial points X0X1,...,XNto determine the values of the objective function for N+1 points, that is, the coordinates in N+1 dimensions for N+1 points are used as the parameters of the pre-emphasis digital input block distortion energy measurement out-of-band radiation of the respective feedback signals, respectively;

2) comparison of the corresponding values of the objective function for the corresponding points, the installation point XH as the worst point (i.e. the objective function value corresponding to the point XH, is the largest, denoted as FH); installation point XBas the following after the worst or second worst point (i.e. the objective function value corresponding to the point XBa little less than XHbut higher than for the other points, denoted as FB); installation point XLas the best point (i.e., the objective function value corresponding to the point XLwill be minimal, which is denoted as FL). Then carry out the reflection point XLin relation to all other points to gaining the new point X Rin accordance with the following formula:

XR=2C-XH,

where

3) calculate the objective function value corresponding to the point XRwhich is denoted as FR. If FRmore than the value of the objective function corresponding to XBthat means that XRtaken too far, and you want compression, that is, this point will be returned back in the direction of compound XHand XRto obtain a new point XRthe specific formula is as follows:

Xr=(1-λ)XH+1XR,

where λ - the compression factor and is a constant between 0 and 1. To prevent the imposition of a new point of reflection at the point XCvalue λ must not be equal to 0.5. The imposition of XRand XCreduces the number of measurements, which reduce to ensure convergence of the iterative process of optimal decision.

4) after compression, if the value of the objective function FRcorresponding to the new point XRthat is still more than the value of the objective function FBcorresponding to the point XBproduce a reduction of distances to all points, including the optimal point XLhalf and move on to step 2). The specific formula is as follows:

Xi=(XL +Xi)/2, where i=1, 2,..., N;

5) after compression, if the value of the objective function FRcorresponding to the point XRno longer exceeds the value of the objective function FBcorresponding to the point XBthe worst point XHreplace new point XRand move on to step 2) for subsequent execution of the iterative process.

Industrial applicability

The present invention can accordingly be used for adaptive input digital pre-emphasis signals in broadband wireless transmitters. In the transmitted signals enter predistortion to compensate for the nonlinear characteristics of the nonlinear transmission channels and to suppress out-of-band radiation of the output signals. At the same time through the use of multiparameter optimization process allows the adaptive adjustment of the parameters of the pre-emphasis using system input pre-emphasis based on slow changes in the nonlinearity of the transmission channels.

From the above description and drawings for specialists in the art will understand that the specific variants of the embodiments presented and described for illustration only and are not intended to limit the scope of the present invention. For specialists in the art it will be obvious that the present image is eenie may be embodied in other specific forms without departing from its essence or essential characteristics. Links to detailed descriptions of specific options embodiments are not intended to limit the scope of the present invention.

1. The input device adaptive digital pre-emphasis for broadband transmission of digital signals using the wireless transmitter in the transmission channel, containing a modulator designed for wideband digital modulation signals, the block input pre-emphasis, coupled to the modulator, designed to receive and input distortion in the modulated signals to analog (d/a) Converter connected to the block input pre-emphasis intended for receiving and converting signals introduced into them by the pre-emphasis coming from a block of input pre-emphasis, the inverter frequency increase, coupled with a digital to analog Converter, used for receiving and converting the converted signals from the digital to analogue Converter, a power amplifier connected to the transducer frequency increase, designed to receive and amplify signals, converted with increasing frequency coming from the transducer to increase the frequency, the antenna connected to a power amplifier designed for the transmit and receive amplified signals from the power amplifier, Converter Pont is the supply frequency, connected to a power amplifier, used for receiving and sending back part of the amplified signal from the amplifier, a local oscillator connected between the inverter to increase the frequency and transducer frequency reduction intended for the transmission of signal fluctuations on the boost Converter frequency Converter frequency reduction, analog-to-digital Converter, coupled to the Converter frequency reduction, used for receiving and converting the converted feedback signals coming from the transducer frequency reduction, adaptive controller setting pre-emphasis, coupled with the analog-digital Converter and input block de-emphasis intended for receiving the converted feedback signals from the analog-digital Converter and pre-emphasis settings of the input block with adaptive pre-emphasis adjustment, and the adjusted transmission parameters of the pre-emphasis block input pre-emphasis, while broadband digital signals intended for transmission to, proceed in the digital block input pre-emphasis and process with the help of digital block input pre-emphasis, then convert using digital to analogue Converter and the inverter frequency increase, then reinforce with the aid of the d power amplifier and transmitted through the antenna; and at the same time part of the amplified signals at the output of the power amplifier, sent back by the feedback circuit in which the feedback signals transform with decreasing frequency using the Converter frequency reduction and transform using analog-to-digital Converter and processed using adaptive controller predistortion parameter, in which the energy of the out-of-band radiation of the feedback signals is used as the objective function, and the parameters of the adaptive pre-emphasis regulate through the use of multi-parameter optimization process, which provides the ability to maintain the transmission channel linear transmission characteristics.

2. The input device adaptive digital pre-emphasis according to claim 1, characterized in that the adaptive controller setting pre-emphasis module contains estimates of the power spectrum and the adaptive module, the signals at the output of the analog-to-digital Converter, and transmitted to the module estimates the power spectrum to estimate the power spectrum and the adaptive module to implement the adaptive adjustment of the parameters of the pre-emphasis intended for transmission to the block input pre-emphasis.

3. The input method of adaptive digital pre-emphasis for transmitting broadband digital signals from wireless is the main transmitter in the transmission channel, contains the following steps:

a) performing a nonlinear transformation that is opposite to the characteristic of the nonlinearity of the transmission channel using the keypad input pre-emphasis in relation to broadband digital signals, and digital input block contains a set of pre-emphasis parameter pre-emphasis;

b) amplification through amplifier signals introduced by the pre-emphasis after passage through the channel conversion with increasing frequency;

c) transfer back to the adaptive controller through the connector part of the amplified signals at the output of the power amplifier;

d) performing a signal processing feedback with adaptive controller for power generation out-of-band radiation feedback signals; and

e) updating the parameters of the distortion by using a multi-parameter search engine optimal values using the energy out-of-band radiation as the target function.

4. The method according to claim 3, characterized in that the energy use of out-of-band radiation as the objective function in step (e) includes the use of energy out-of-band radiation feedback signals as the target function of the adaptive optimization of the pre-emphasis parameter.

5. The method according to claim 3, featuring the the action scene, the update phase includes the use of pre-emphasis settings digital input block distortion in the quality factors of the objective function when the value of the objective function has a minimum value, the value of the relevant factors is the optimal parameter values of the predistortion.

6. The method according to claim 3, characterized in that the step of using the multi-parameter module find the optimal value for parameter updates pre-emphasis on the step e) includes the following steps:

1) selecting, if necessary, N+1 initial points in N dimensions, the coordinates of which are used as the N parameters of the digital input block distortion when N parameters is treated using a block of input pre-emphasis, carry out the relevant measurement of energy out-of-band radiation of the respective feedback signals;

2) determination of the optimal point, the worst point and the second worst point of N+1 points on the basis of measured values of energy out-of-band radiation;

3) the designation of all points, except the worst point as points of reflection of the worst point;

4) measurement values of the objective function corresponding to each of the reflection points, if the value of the objective function corresponding one of the reflection points is greater than the value C is the left function, the corresponding second worst point, the return and the compression of one of the reflection points from the original direction of reflection;

5) determining whether the value of the objective function for compressed to the point of reflection is still larger than the value of the objective function corresponding to the second worst point, and if so, reducing by half the distance between the optimal point and all points except the optimal point, and

6) go to step 2) for a subsequent adjustment of pre-emphasis settings.



 

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