US Patent No. 9,184,814

METHOD FOR PRE-DISTORTING AND A PRE-DISTORTER


Patent No. 9,184,814
Issue Date November 10, 2015
Title Method For Pre-distorting And A Pre-distorter
Inventorship James Peroulas, San Mateo, CA (US)
Feng Zeng, Shanghai (CN)
Dongfang Ning, Shaanxi (CN)
Zeliang Yang, Guangdong (CN)
Yijun Duan, Shanghai (CN)
Weiming Pan, Shanghai (CN)
Zhengjian Dai, Shaanxi (CN)
Aimin You, Guangdong (CN)
Assignee ZTE Corporation, Shenzhen (CN) ZTE Wistron Telecon AB, Stockholm (SE)

Claim of US Patent No. 9,184,814

1. A pre-distorter, which comprises:
a pre-distortion module, which is configured to pre-distort a plurality of baseband input signals by an equal number of pre-distortion
functions to obtain an equal number of pre-distorted signals respectively, wherein the number of the inputs of each pre-distortion
function is equal to the number of the plurality of baseband input signals, and all of the plurality of baseband input signals
are input into each of the pre-distortion functions, and each of the pre-distortion functions has one output which is dependent
on all of the inputs of the pre-distortion function;

a frequency shifting module, which is configured to frequency shift the output of each pre-distortion function of the pre-distortion
module, wherein a center frequency of the output of each pre-distortion function is shifted to a transmitting carrier frequency;

an adder, which is configured to combine all of the frequency-shifted outputs from the frequency shifting module into one
combined signal; and

a power amplifier (PA), which is configured to amplify the combined signal,
wherein the cascade of the pre-distortion functions and the PA are linear overall.