Linearization device and linearization method in broad-band communication system

Abstract

The invention discloses a linearization device with a memory nonlinear amplifier and a linearization method in a broad-band communication system. The linearization procedure is as follows: using a frequency domain dresser, a time domain dresser and a self-adaptive filter to respectively carry out frequency domain dressing, time domain dressing and filtering processing for transmitting signals andamplifying the dressed signals: attenuating the amplified signals to the electrical level before amplification and feeding back the signals and using feedback signals and input signals to respectively update filter tap coefficient, a time domain checking table and a frequency domain checking table; repeating the above steps to continually update the frequency domain checking table, the time domain checking table and the filter tap coefficient and then carrying out frequency domain dressing, time domain dressing and filtering processing for generated transmission signals by utilizing the updating value of the filter tap coefiicient, the dressing value of the time domain dresser and the dressing value of the frequency domain signal dresser; repeating the operation again and again till realizing the linearization function of an amplifier in a broad-band OFDM system. The invention has the advantages of high convergence speed, high convergence precision and high degree of linearization.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to an amplifier linearization device in a broadband orthogonal frequency division multiplexing OFDM system, which can be used for eliminating nonlinear distortion of an amplifier with memory in a broadband communication system. Background technique [0002] OFDM is one of the key technologies in modern communication systems. It converts the high-speed data stream into several sub-carrier channels with a relatively low rate for transmission through serial-to-parallel conversion. The OFDM system has attracted much attention due to its advantages of high spectral efficiency and anti-multipath fading, and has become one of the core technologies in the next generation wireless communication system. Many protocols such as DVB and IEEE 802.11a have adopted OFDM as the main modulation and transmission technology. The basic principle of OFDM is to distribute high-speed data streams to s...

AI Technical Summary

Problems solved by technology

However, since this technology uses the same number of tap coefficients as the number of lookup tables, the number of tap groups that need to be updated is greatly increased; at the same time, an indirect learning structure is used to update the filter tap coefficients, resulting in slow system convergence and poor convergence accuracy. not high disadvantage

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