Datang Mobile Communications Equipment Co., Ltd.

Jun Xiong

Tao Duan

Huarong Sun

Jieli Wang

Peng Xiao

Ce Wang

Bin Xue

Bin Zhang

Pengpeng Zhang

Xinmin Wang

Yongli Zhang

Jintao Chen

Jingyi Wang

Yanhui He

Disclosed are a multi-carrier superposition method and device. First, input carrier signals are superposed, and gain reduction processing is conducted during the superposition process, and then CFR processing and increase processing are conducted on the superposed carrier signals. Thus, under the circumstance of multi-carrier superposition, it can be effectively ensured that signals cannot overflow, and meanwhile the requirement for precision of a system during processing is met.

Multi-carrier superposition method and device

Disclosed is a DPD system. A DPD system provided in an embodiment of the present invention includes a table look-up unit and a DPD processing unit. First to Nth look-up-tables are used to combine two bit sequences of bit sequences obtained according to first to fourth address conversion tables so as to obtain first to Nth table look-up addresses. First to Nth DPD coefficients are found according to the first to Nth table look-up addresses, and one DPD coefficient is obtained via a DPD coefficient combination module, such that the DPD processing unit can perform DPD processing on a signal in first band according to the DPD coefficient. In the embodiment of the present invention, a look-up address is obtained according to four address conversion tables, a DPD coefficient is obtained from a look-up-table according to the look-up address, and then a final DPD coefficient is obtained to perform signal processing. Thereby, a look-up address generation solution is provided for a multi-band DPD system to realize multi-band DPD processing.

DPD system

The present application relates to the field of digital pre-distortion processing. Disclosed in an embodiment of the present application are a pre-distortion parameter obtaining method and pre-distortion system for simplifying calculating complexity of a model while achieving good signal processing effect. The method comprises: after the beginning of periodic filtering processing, obtaining a pre-distorted signal after pre-distortion processing and a first feedback signal after power amplification (S); obtaining a second feedback signal by eliminating the rated linear gain of the first feedback signal (S); determining a pre-distortion parameter according to a matrix formed by the second feedback signal and a matrix formed by the pre-distorted signal (S); updating the pre-distortion parameter index table according to the determined pre-distortion parameter ().

Digital pre-distortion parameter obtaining method and pre-distortion system

The disclosure discloses a method and device for performing peak clipping to multiple carrier waves, the method includes: according to carrier wave number of configured multiple carrier waves, signal bandwidth and occupied bandwidth of each carrier wave, obtaining total signal bandwidth and total occupied bandwidth of the corresponding carrier waves; according to the total signal bandwidth and the total occupied bandwidth of the multiple carrier waves, generating a digital filter with set order, and obtaining filter coefficient of the digital filter; taking the filter coefficient as a peak clipping coefficient and using the peak clipping coefficient to perform peak clipping to the peak-to-average ratio signals of the carrier waves. By the disclosure, the complexity of the generation of the peak clipping coefficient is simplified, the deterioration degree of EVM is reduced, and the distortion degree of signals is also reduced.

Method for performing peak clipping to multiple carrier waves and device thereof

A digital predistortion processing method and system comprises extracting from a predistortion coefficient parameter table a predistortion parameter corresponding to an input signal, so as to predistort the input signal and obtain a forward transmission signal; amplifying the power of the forward transmission signal to obtain an output signal; acquiring the output signal to obtain a feedback signal; delaying a predetermined number of sampling points so as to acquire the forward transmission signal and obtain a reference signal; conducting synchronization-related calculation on the reference signal and the feedback signal, and calibrating the feedback signal; training a predistortion coefficient according to the reference signal and the calibrated feedback signal; and forming the predistortion coefficient parameter table according to the predistortion coefficient and the amplitude of the input signal. The present invention can delay a predetermined number of sampling points for a transmission signal, thus greatly improving radio frequency index (ACPR).

Digital predistortion processing method and system

The invention is a method and a system for updating pre-distortion coefficients, which is used to solve the problem of interference with neighbor cells due to the inferior pre-distortion coefficients. The method includes: presetting a primary table and a standby table, which store default and updated pre-distortion coefficients respectively; when a data source of a pre-distortion processor adopts the standby table, adopting the updated pre-distortion coefficients to perform parameter output processing to acquire pre-distortion parameters, and conveying the pre-distortion parameters and an input signal to the pre-distortion processor to process to acquire pre-distortion signals; conveying the pre-distortion signals through various signal processors to acquire a first signal, and determining the power data of the first signal; and based on the comparing result of the power data of the first signal and a setting range, there are different actions.

Method and system for updating predistortion coefficient

Disclosed are a method and a system for updating a multi-frequency band pre-distortion coefficient lookup table, in order to solve the problems that the calculation complexity is high. Wherein, the method comprises: collecting a first frequency band reference signal and a first frequency band feedback signal, a second frequency band reference signal and a second frequency band feedback signal; calculating a first frequency band pre-distortion coefficient and a second frequency band pre-distortion coefficient; performing phase calibration on the first frequency band pre-distortion coefficient and the second frequency band pre-distortion coefficient, respectively; and updating a first lookup table according to the first frequency band pre-distortion coefficient performed the phase calibration, and updating a second lookup table according to the second frequency band pre-distortion coefficient performed the phase calibration.

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Beijing, China

Jun Xiong