Apparatus and method for implementing predistortion treatment of baseband signal
A pre-distortion processing and baseband digital signal technology, applied in the field of communication, can solve the problems of reducing signal transmission efficiency and inaccurate selection of pre-distortion coefficients, and achieve the effect of saving delay processing and improving efficiency
Inactive Publication Date: 2013-01-23
TD TECH COMM TECH LTD
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[0017] In the above-mentioned device, since the predistortion coefficient is searched according to the instantaneous and short-term power statistics of the baseband digital signal from the digital modulation unit, on the one hand, it takes a lot of time to perform calculations such as power statistics, resulting in the need for digital modulation. The baseband digital signal of the unit is delayed, which reduces the efficiency of signal transmission; on the other hand, because the statistical calculation of instantaneous and short-term equal power is based on the slow change of signal power, at this time, for systems such as TDD, due to The power of signals in different time slots will change suddenly, so when this method is used, it will cause problems such as inaccurate selection of pre-distortion coefficients
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[0066] In the present invention, in order to improve the transmission efficiency of data, the time difference of processing the baseband digital signal of the received current time slot by the digital modulation unit can be fully utilized to complete the selection of the pre-distortion coefficient, thereby avoiding waiting until the digital modulation unit processes the received current time slot. The time delay caused when the baseband digital signal of the time slot is processed and then the pre-distortion coefficient is selected to improve the data transmission efficiency.
[0067] Furthermore, in the present invention, the processing is performed in units of time slots, so as to avoid the problem of inaccurate selection of pre-distortion coefficients caused by sudden changes in power between time slots.
[0068] Therefore, the DPD processing unit in the present invention can be: save and update the predistortion coefficient table, obtain the average value amplitude of the b...
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The invention discloses a device for digital predistortion (DPD) processing of baseband signals, comprising at least one baseband carrier unit, a reverse training unit and a DPD processing unit, wherein the DPD processing unit is used for storing and updating a predistortion coefficient table, acquiring the mean amplitude of digital baseband signals of various carriers of the current time slot, calculating and obtaining the mean DPD input amplitude of the current time slot according to the mean amplitude of the digital baseband signals of the various carriers of the current time slot, selecting a corresponding predistortion coefficient from the predistortion coefficient table according to the mean DPD input amplitude of the current time slot to perform predistoriton processing on the digital baseband signals of the current time slot, and then generating output of the digital predistortion baseband signals. Moreover, the invention also discloses a method for digital distortion processing of the baseband signals. The proposal in the device can improve the efficiency of data transmission.
Description
technical field [0001] The invention relates to signal processing technology in the field of communication, in particular to a device and method for performing pre-distortion processing on baseband signals. Background technique [0002] Digital predistortion (DPD) technology is widely used to improve the efficiency of power amplifiers. According to the nonlinear characteristics of the power amplifier (amplitude and phase distortion), the signal input to the power amplifier is subjected to reverse predistortion processing, that is, the non-linear The pre-distortion coefficient calculated by the linear characteristic performs pre-distortion processing on the input signal, and the pre-distortion processed signal is input to the power amplifier, so that the two nonlinear distortion functions are combined to obtain a highly linear and distortion-free amplified output signal. [0003] The transmission link of the communication system usually includes a power amplifier, which is us...
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IPC IPC(8): H04L25/49
Inventor 熊兵朱卉卢山陶焕磊
Owner TD TECH COMM TECH LTD