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Method based on slide window for estimating and equalizing channels of block signals containing pilot

A sliding window and channel estimation technology, applied in the field of information transmission technology, can solve the problems of high cost, poor ISI effect, complex structure, etc., and achieve the effect of reliable reception and good performance

Inactive Publication Date: 2003-02-19
TSINGHUA UNIV
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Problems solved by technology

[0018] The equalizer technology is relatively mature and is widely used in various communication fields, but it has two disadvantages: one is that the structure is complex and the cost is higher; The ISI effect is relatively poor
Therefore, COFDM uses an iterative approximation algorithm, so there is a problem of convergence error and convergence time

Method used

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  • Method based on slide window for estimating and equalizing channels of block signals containing pilot
  • Method based on slide window for estimating and equalizing channels of block signals containing pilot
  • Method based on slide window for estimating and equalizing channels of block signals containing pilot

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Embodiment Construction

[0148] We first introduce the general model of channel transmission. As shown in Figure 1A, the signal received by the information sequence Info(n) after being transmitted through a channel with an impulse response of h(n) is:

[0149] Rec(n)=Info(n)*h(n)+w(n)

[0150] Where w(n) is additive noise, and Info(n)*h(n) represents the linear convolution operation of Info(n) and h(n). Since there is an impulse response h(n) of the transmission channel, h(n) is composed of some multipath components with different delays and different amplitudes and phases, which means that during the transmission process, the information passes through multiple channel reflections and refractions. After each path reaches the receiver with different attenuation and delay, the signal Rec(n) received by linear convolution will produce time dispersion and intersymbol interference (ISI). Here Info(n), h(n), w(n) and Rec(n) are complex-valued functions of n, where n represents a discrete time variable.

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Abstract

Channel estimation of block signals containing pilot frequency and balanced method characterizes in containing side channels of force and after of a main channel component in a movable window to determine to get a correct channel estimation interval again to get channel impulse response estimation with the length of N, M or M+2XN, then to take position of home and end of the said window as the positioning information needed by circular convolution of the signal and channel inputs response structure and process the data block via channel transmission as the one after channel distortion via frequency domain balance offset or make time-domain over-sampling channel estimation in the sliding window interval to inerase time-domain resolution of channel estimation. The data block can be IDFT of OFDM or modulated by single carrier.

Description

technical field [0001] The invention belongs to the field of information transmission, especially the information transmission technology in the application of Internet, digital TV, data broadcasting, data communication and the like. Background technique [0002] After more than ten years of unremitting research and development, Digital Television Terrestrial Broadcasting (DTTB) has achieved many results and reached the stage of realization. Since November 1998, DTTB programs have been broadcast in North America and Europe, and many countries have announced their DTTB system selection and implementation plans. Currently, there are three main DTTB transmission standards in the world: [0003] 1) Trellis-Coded 8-Level Vestigial Side-Band (8-VSB) modulation system developed by the Advanced Television Systems Committee (ATSC). [0004] The ATSC digital television standard was developed by the Advanced Television Systems Committee ATSC. [0005] In May 1993, several groups res...

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Application Information

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IPC IPC(8): H04B1/76H04L27/01H04N7/015
Inventor 杨知行胡宇鹏王军潘长勇杨林
Owner TSINGHUA UNIV
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