Signal detection method for space time block code (STBC)-orthogonal frequency division multiplexing (OFDM) system under condition of lack of cyclic prefix

A technology of STBC-OFDM and cyclic prefix, applied in the field of wireless and mobile communication

Inactive Publication Date: 2013-07-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the promotion of STBC multi-antennas in the prior art, and to propose a signal detection method for the STBC-OFDM system under the absence of a cyclic prefix

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  • Signal detection method for space time block code (STBC)-orthogonal frequency division multiplexing (OFDM) system under condition of lack of cyclic prefix
  • Signal detection method for space time block code (STBC)-orthogonal frequency division multiplexing (OFDM) system under condition of lack of cyclic prefix
  • Signal detection method for space time block code (STBC)-orthogonal frequency division multiplexing (OFDM) system under condition of lack of cyclic prefix

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Embodiment Construction

[0059] The specific implementation examples of the present invention are given below. It should be noted that the parameters in the examples do not affect the generality of the present invention.

[0060] The signal detection method of STBC-OFDM system under the absence of cyclic prefix, such as figure 2 shown, including the following steps:

[0061] S1: Since the channel state information can be obtained through channel estimation, and the receiving end has completed the detection of the i-1th frame data, it can be assumed that these two quantities are known; use the known channel state information and the previous frame data , get the i-th frame data response y i Intersymbol Interference in

[0062] Let the frequency-domain symbol data sent by antenna 1 in the i-th frame be expressed as The frequency-domain symbol data sent by antenna 2 in the i-th frame is expressed as Since the communication system is an STBC-OFDM system, the frequency-domain symbol data sent by a...

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Abstract

The invention discloses a signal detection method for space time block code (STBC)-orthogonal frequency division multiplexing (OFDM) system under a condition of lack of a cyclic prefix, and belongs to the technical field of wireless communication. By eliminating inter-sign interference and reconstructing cyclic convolution, an OFDM transmission system is equivalent to N parallel Gaussian channels with different gains; and due to the orthogonality of an inter-antenna channel matrix, an STBC-OFDM sign can be detected. For the STBC-OFDM system for twice transmitting and once receiving, data received at a first time slot are subjected to inter-sign interference elimination firstly, the first approximation is performed on two time slot cyclic convolutions, and the data of the STBC-OFDM system are detected by virtue of the orthogonality of a space channel matrix and the diagonal capacity of a frequency domain channel matrix; and finally, the cyclic prefix of the data of two time slots are restored through iteration, and the data received by a second time slot are subjected to the inter-sign interference elimination, so that the data detection precision is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless and mobile communication, and in particular relates to a technique for eliminating inter-symbol interference and cyclic prefix reconstruction under the condition that a cyclic prefix is ​​absent in an STBC-OFDM system, and further performing inter-symbol interference elimination and cyclic prefix reconstruction through iteration. The repair of cyclic prefix reconstruction, and then reach the signal detection method of ideal detection performance. Background technique [0002] As an effective anti-fading transmit diversity technology, Space Time Block Codes (STBC) technology is relatively simple to implement encoding and decoding, using maximum likelihood (ML) decoding, which only involves simple linear processing operation. However, it is generally applicable to flat fading channels of narrowband wireless systems. For channels with obvious multipath, complex channel equalization technology is re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L27/26H04L25/03
Inventor 雷霞曹海波乐荣臻孔昭富李垠泽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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