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Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device

A technology of data detection and channel estimation, applied in multi-frequency code systems, baseband system components, etc., can solve problems such as increasing system complexity and increasing system transmission power

Inactive Publication Date: 2009-08-19
PLA UNIV OF SCI & TECH
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Problems solved by technology

This method increases the transmission power of the system and increases the complexity of the system

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  • Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device
  • Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device
  • Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device

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Embodiment Construction

[0061] The basic idea of ​​the method of the present invention is: first, the useful signal at the sending end is superimposed on the known pilot symbol at the receiving end and then sent to the channel, and then at the receiving end, the correlation between the frequency domain channels of each sub-carrier is used to utilize the signal based on the reduced state The Soft Output Viterbi Algorithm (RS-SOVA) is a maximum likelihood criterion detector to estimate the frequency domain channel and detect useful signals. It includes: (1) superimposing pilot frequency at the sending end; (2) using RS-SOVA to estimate frequency domain channel and detect useful signal at the receiving end. In order to better understand the technical solution of the present invention, the downlink of the air interface technology WirelessMAN-OFDM stipulated in the IEEE802.16a standard is taken as an example for description below. The WirelessMAN-OFDM system uses 256 sub-carriers, and the carrier frequenc...

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Abstract

A joint semi-blind channel estimation and data detection method based on superimposed pilots, which is characterized in that firstly at the transmitting end, the useful symbols are superimposed on the pilot symbols known at the receiving end and then sent to the channel, and then at the receiving end, each sub- The frequency domain correlation between the carrier frequency domain channels, the frequency domain channel is equivalent to a finite state machine; then, use the maximum likelihood criterion detector to detect useful symbols, use the detected useful symbols to perform LS channel estimation, and update the channel state machine to detect the next useful symbol.

Description

technical field [0001] The invention relates to a space-time orthogonal frequency division multiplexing (ST-OFDM) system used for estimating the frequency selective fading channel of the ST-OFDM system and detecting data at the same time, especially a joint semi-blind channel based on overlapping pilots The estimation and data detection method (Joint Semi-Blind Channel Estimation and Data Detection, JSBCEDD) belongs to the field of broadband wireless data transmission. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a technology that can effectively resist frequency selective fading. Combining space-time block coding (STBC) technology with OFDM can provide better system performance and higher data transmission rate for wireless communication systems. In coherent detection ST-OFDM systems, channel estimation greatly affects the performance of the entire communication system. In order to obtain the correct estimation of the channel, trainin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 杨炜伟蔡跃明李子吴启晖徐友云
Owner PLA UNIV OF SCI & TECH
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