Fast convergence rate adaptive blind estimation method for characteristic parameter

A technology of characteristic parameters and convergence speed, applied in baseband system components, multi-frequency code systems, etc., can solve problems such as inability to track channels, inability to track channel changes, and high requirements for equipment calculation accuracy, so as to improve system performance and convergence. fast effect

Inactive Publication Date: 2007-07-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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Problems solved by technology

However, the RLS algorithm also has some inherent defects: in order to reduce the noise in the prediction, when the prediction parameters tend to the true value, the Kalman gain vector in the RLS algorithm is close to 0, which may not track the channel change
When these algorithms are used for channel equalization, they can quickly track the channel when the signal-to-noise ratio is high, and when the signal-to-noise ratio is poor, the channel mutation will be submerged in the noise and the channe

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  • Fast convergence rate adaptive blind estimation method for characteristic parameter
  • Fast convergence rate adaptive blind estimation method for characteristic parameter
  • Fast convergence rate adaptive blind estimation method for characteristic parameter

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Embodiment Construction

[0072] The technical solution of the present invention will be further described through specific implementation below.

[0073] The specific steps are:

[0074] 1. The sending end sends in the OFDM modulated baseband signal to generate a guard interval, and generates a transmit signal through the D / A and shaping filter.

[0075] 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.

[0076] Y=Xh+v (30)

[0077] 3. Set parameter μ 0 , the value of a, b, calculate the step size matrix μ n . in:

[0078] mu n = α n ×μ 0 (31)

[0079] α n = C 1 1 + an b - - - ( 32 ) ...

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Abstract

This invention provides a character parameter adaptive blind estimation method with quick convergency speed, which applies a time-varying step to improve the convergency speed of the algorithm and gets the best filter weight coefficient, applies soft judgement weighing to maintain the Rodust of hard judgement errors and channel noises, which is a channel blind estimation method with quicker convergency speed and higher accuracy than the current recursion least square technology and is used in all kinds of communication systems applying OFDM, and in CDMA and TDMS systems, at the same time, such method can be used in all RLS algorithms and its derived algorithms and devices to estimate other character parameters.

Description

Technical field: [0001] The invention relates to a characteristic parameter self-adaptive blind estimation method with fast convergence speed. In particular, it relates to a wireless mobile channel self-adaptive self-estimation method, which belongs to the field of digital mobile communication using electromagnetic wave technology, and especially relates to digital TV, single-carrier OFDM communication system, multi-carrier OFDM communication system, wireless local area network (WLAN), etc. using OFDM modulation. Channel Estimation Techniques in Communication Systems. 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 RLS methods and their derived methods to estimate communication, radar, aerospace, etc. , remote control telemetry, sonar, image processing, computer vision, biomedical engineer...

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
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