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MLSE simplification detection method and its device based on blocked QR decomposition

A technology of QR decomposition and detection method, applied in baseband system components, electrical components, transmission systems, etc., can solve problems such as reducing complexity and high complexity, and achieve the effect of reducing complexity and reducing detection complexity.

Inactive Publication Date: 2010-06-23
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a MLSE simplified detection method and its use device, which can reduce the complexity on the basis of ensuring a certain performance gain, and can solve the related data introduced by the precoding at the sending end in the DFT-S-OFDM system , after the superposition of multipath channel and noise, the high complexity problem caused by applying the maximum likelihood sequence detection algorithm at the receiving end

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  • MLSE simplification detection method and its device based on blocked QR decomposition
  • MLSE simplification detection method and its device based on blocked QR decomposition
  • MLSE simplification detection method and its device based on blocked QR decomposition

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Embodiment Construction

[0029] At first, illustrate the inventive thought:

[0030] (1) the present invention provides a kind of simplified MLSE detection algorithm, comprises the following steps:

[0031] Carry out QR decomposition of the channel matrix H, that is, divide H into an orthogonal matrix Q and an upper triangular matrix R, and divide the upper triangular matrix R into a K×K block upper triangular matrix by row and column with a certain length as the unit; Then the column vectors Y', S, W' are all divided into K segments corresponding to the row with the certain length as the unit, and each segment is expressed as Y' k , R k , S k , W′ k , k=1..K, where S is any possible unprecoded transmitted symbol sequence vector, W is the response of AWGN in the frequency domain, Y is the column vector of received symbols, Y′=Q -1 *Y, W'=Q -1 *W;=Q -1 is the inverse matrix of the orthogonal matrix Q.

[0032] Select and receive the sequence column vector Y' from the segmented candidate input se...

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Abstract

The invention relates to a MLSE simplification detection method based on the blocking OR decomposition and a device thereof; wherein the method comprises the following steps: the blocking OR decomposition based on the channel matrix H segments the user signal vector Y which is detected and the transmitting symbol series vector used for detection; maximum likelihood iterative detection is implemented in each section of vector from Z to A; the judgement result is combined and output. The device comprises a channel estimator(32), a channel matrix decomposition module(35), a block ML detector(31)and a segmenting length selection module(36) which is connected with or internally installed in the ML detector; wherein the channel estimator(32), the channel matrix decomposition module(35) and theblock ML detector(31) are connected with each other in turn. The device and the method iterate and process the user signals in segmentation, which greatly reduces the complication of the MLSE algorithm. Based on the certain performance gain, the complication of detection is greatly reduced at the cost of small quantity of detection performance; therefore, the detection method and the device whichare simplified need the general requirement for the hardware and the processing ability of the hardware and offer convenience for the practical application.

Description

technical field [0001] The present invention relates to anti-interference detection of baseband transmission in a wireless communication system, in particular to a single-carrier system, especially in a DFT-S-OFDM system where a large amount of detected data is correlated, using maximum-likelihood sequence estimation maximum likelihood sequence detection, MLSE is referred to as the detection method and its device as the main means of the receiving end. Background technique [0002] For actual baseband transmission systems, crosstalk is unavoidable. When the influence of crosstalk is serious, the transfer function of the whole system must be corrected or equalized to make it close to the condition of distortion-free transmission. The equalizer at the receiving end is usually placed in the intermediate frequency or baseband of the receiver, which produces characteristics opposite to the channel characteristics, and is used to offset the interference caused by the time-varying...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04L25/02
Inventor 张峻峰孙亮王亚峰文娟
Owner ZTE CORP