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Quick time-varying channel blind estimation method

A time-varying channel and fast technology, applied to baseband system components, multi-frequency code systems, etc., can solve the problems of high-speed convergence and small steady-state error of the LMS algorithm, and achieve the effect of improving system performance

Inactive Publication Date: 2007-07-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, although the algorithm is simple to calculate, the high-speed convergence and small steady-state error of the LMS algorithm cannot be achieved at the same time, and the iteration step size is an important parameter to coordinate the contradiction between the two

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  • Quick time-varying channel blind estimation method
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  • Quick time-varying channel blind estimation method

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Embodiment Construction

[0067] The technical solution of the present invention will be further described through specific implementation below.

[0068] The specific steps are:

[0069] 1. The sending end sends in the baseband signal u(n) modulated by OFDM to generate a guard interval, and passes through the D / A and shaping filter to generate a transmission signal.

[0070] 2. At the receiving end, after the received signal passes through the A / D and low-pass filter, the guard interval is deleted, and the received signal matrix Y is obtained.

[0071] Y=Uh+v

[0072] 3. Set parameter μ 0 , the value of a, b, calculate the step size matrix μ n . in:

[0073] mu n = α n ×μ 0

[0074] α n = C 1 1 + an b

[0075]4. Set parameter β 0 Assuming that the transmission data is expressed as ...

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Abstract

This invention provides a quick time-varying channel blind estimation method, which applies non-linear time-varying function to improve the convergency speed and get the best filter weight coefficient and ideal judgement weighting to maintain the Rodust of judgement error and channel noise. This invention is realized easily used in all kinds of communication systems applying OFDM for channel estimation, CDMA or TDMA system, and this idea can be used in all LMS algorithms and their derived algorithms and devices.

Description

Technical field: [0001] The invention relates to a fast time-varying channel estimation blind method, which belongs to the field of digital mobile communication using electromagnetic wave technology. In particular, it relates to channel estimation technology in digital terrestrial television, single-carrier OFDM communication system, multi-carrier OFDM communication system, wireless local area network (WLAN) and other digital communication systems using OFDM modulation. At the same time, the present invention can not only be used for channel estimation in Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA) systems, but the idea of ​​the present invention can also be used in all LMS methods and their derived methods to estimate radar, aerospace, remote control Other characteristic parameters in fields such as telemetry. Background technique: [0002] In recent years, with the rapid development of digital communication, high-speed data transmission h...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 罗仁泽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST