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Linearization device and linearization method in broad-band communication system

A broadband communication and linearization technology, applied in the field of communication, can solve the problems of low convergence accuracy, slow system convergence, and increase in the number of updated tap groups, so as to eliminate memory nonlinear distortion, simplify the update method and structure, and reduce the impact of small effect

Active Publication Date: 2009-09-30
XIAN CETC XIDIAN UNIV RADAR TECH COLLABORATIVE INNOVATION INST CO LTD
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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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  • Linearization device and linearization method in broad-band communication system
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  • Linearization device and linearization method in broad-band communication system

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Embodiment Construction

[0032] refer to figure 2 The device of the present invention consists of a constellation mapper 111, a serial-to-parallel converter 101, a frequency-domain signal trimmer 102A, a frequency-domain lookup table updater 102B, an inverse Fourier transformer 103, a parallel-to-serial converter 104, and a time-domain signal trimmer 105A, time-domain lookup table updater 105B, time-domain adaptive filter 106A, tap coefficient updater 106B, amplifier 109, attenuator 110, parallel-to-serial converter 107 and Fourier converter 108. in:

[0033] The serial-to-parallel converter 101 is connected after the constellation mapper 111, and the serial-to-parallel converter 101 converts the serial signal into a parallel signal. The frequency-domain signal trimmer 102A is connected between the serial-to-parallel converter 101 and the inverse Fourier transformer 103, and the frequency-domain signal trimmer 102A receives the parallel signal output by the serial-to-parallel converter 101, accordin...

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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 and amplifying 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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/49
Inventor 张海林任智源刘龙伟武德斌
Owner XIAN CETC XIDIAN UNIV RADAR TECH COLLABORATIVE INNOVATION INST CO LTD
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