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Millimeter wave application-oriented improved constant modulus blind equalization method

A constant modulus, blind equalization technology, applied in digital transmission system, shaping network in transmitter/receiver, baseband system, etc., can solve the problem of CMA algorithm unable to correct phase deflection, transmission quality deterioration, large residual error and so on , to achieve the effect of improving channel utilization efficiency, eliminating phase rotation, and improving residual error

Inactive Publication Date: 2019-12-13
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the deterioration of transmission quality caused by inter-symbol crosstalk, phase rotation and other phenomena in the process of broadband continuous data transmission in wireless communication systems, the real and imaginary parts are parallelized, and the leakage algorithm and high-order cumulant ideas are introduced to improve the existing CMA The algorithm cannot correct the phase deflection and the residual error is large after iteration

Method used

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  • Millimeter wave application-oriented improved constant modulus blind equalization method
  • Millimeter wave application-oriented improved constant modulus blind equalization method
  • Millimeter wave application-oriented improved constant modulus blind equalization method

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Embodiment 1

[0070] In this embodiment, the implementation process of the present invention is described by performing blind estimation and compensation on a group of wideband signals that affect the complex channel response, and comparing the result with the traditional CMA algorithm.

[0071] 1. Simulation scene

[0072] The signal at the sending end is modulated by 16QAM, and the signal-to-noise ratio at the receiving end is 30dB after complex channel response, and the algorithm of the invention is used to recover the distorted data.

[0073] 2. Simulation implementation

[0074] The present invention is a channel blind equalization technology combining leakage algorithm and high-order cumulant idea, and the simulation includes the following steps:

[0075] Step 1. The transmitter generates raw data containing only 0 and 1. The length of each data set is L=16000, and a total of 10 sets are sent. Use 16QAM to modulate the original data and perform normalization processing to obtain nor...

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Abstract

The invention provides a millimeter wave application-oriented improved constant modulus blind equalization method, which comprises the following steps of: sampling a received baseband signal, sendingthe sampled baseband signal into an equalizer, calculating an error function by adopting a CMA algorithm according to the output of the equalizer, updating an equalizer coefficient according to the error function, and iterating until correct data is recovered. The method does not need to depend on a training sequence, and can effectively improve the channel utilization efficiency in high-speed continuous communication. Real part and imaginary part parallel processing is adopted, and phase rotation can be eliminated while amplitude distortion is corrected; coefficient updating is carried out bycombining a leakage algorithm and a high-order cumulant thought, and residual errors after iteration of an existing algorithm can be improved under the condition that stepping coefficients are the same.

Description

technical field [0001] The invention relates to the field of broadband wireless communication digital signal processing, and is mainly oriented to the problem of deterioration of transmission quality caused by phenomena such as crosstalk between symbols and phase rotation during broadband continuous data transmission in a wireless communication system, especially a method that does not rely on training sequences and is based on received signals. The method of directly performing blind channel estimation combined with leakage algorithm and high-order cumulant idea for compensation is used for broadband digital signal processing of millimeter-wave wireless communication. Background technique [0002] In the actual system, due to the finite length truncation of the filter and the deviation of the timing sampling time, it will cause the superposition of the front and back tails between the symbols, thus causing the intersymbol crosstalk. The in-band amplitude and phase of broadb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02
CPCH04L25/0238H04L25/03089
Inventor 王瑜吴道龙茅迪徐媛媛李晓冬
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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