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Channel estimation blind method of radio communication system

A wireless communication system and channel estimation technology, applied in the field of channel estimation in digital communication systems, can solve problems such as noise enhancement, inability to use frequency band utilization multi-level modulation technology, performance degradation, etc., 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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Problems solved by technology

However, differential modulation has two disadvantages: it increases the noise by 3dB, and it cannot use multi-level modulation technology with high frequency band utilization; while continuous modulation allows the use of any constellation
Although these algorithms have improved in tracking ability, the performance will drop sharply when the signal-to-noise ratio is small

Method used

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  • Channel estimation blind method of radio communication system
  • Channel estimation blind method of radio communication system
  • Channel estimation blind method of radio communication system

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Embodiment Construction

[0070] The technical solution of the present invention will be further described through specific implementation below.

[0071] The specific steps are:

[0072]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.

[0073] 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. Among them, h is an unknown channel, and v is the noise in the transmission process.

[0074] Y=Uh+v (1)

[0075] 3. Set parameter μ 0 , the value of a, b, calculate the step size matrix μ n . in:

[0076] mu n = α n ×μ 0 (2)

[0077] α n = C 1 1 + a n b ...

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Abstract

This invention provides a blind method for estimating new radio communication system channels, which applies the time-varying step to improve the convergency speed of the algorithm and gets the best filter weight coefficient quickly'applies ideal judgement weighing and modification to maintain the Rodust of hard judgement error and channel noise, which gets a blind estimation method for channels with quicker convergency speed to the current recursion least square technology and can be used in channel estimation in all kinds of communication systems applying OFDM, or CDMA and TDMA systems.

Description

Technical field: [0001] The present invention relates to a new blind method for channel estimation in wireless communication systems, which belongs to the field of digital mobile communication using electromagnetic wave technology, in particular to digital TV, single-carrier OFDM communication systems, multi-carrier OFDM communication systems, wireless local area networks (WLAN) etc. using OFDM Channel Estimation Techniques in Modulated Digital Communication Systems. Meanwhile, 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 to estimate other characteristic parameters in all RLS methods and their derived methods. Background technique: [0002] The goal of the next generation mobile communication system is to adapt to the rapidly increasing number of mobile users and realize wireless mobile multimedia transmission...

Claims

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Application Information

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