Signal detection method for stbc‑ofdm system with missing cyclic prefix

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

Inactive Publication Date: 2017-02-15
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 stbc‑ofdm system with missing cyclic prefix
  • Signal detection method for stbc‑ofdm system with missing cyclic prefix
  • Signal detection method for stbc‑ofdm system with missing 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, the receiving end has already detected the i-1th frame data, so these two quantities are known; using the known channel state information and the previous frame data, we can get i frame data response y i Intersymbol Interference in where 0≤k≤L;

[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 antenna 1 in the i+1t...

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Abstract

The invention discloses a signal detection method of an STBC-OFDM system under the absence of a cyclic prefix, belonging to the technical field of wireless communication. The invention makes the OFDM transmission system equivalent to N parallel Gaussian channels with different gains by eliminating the inter-symbol interference and the reconstruction of the circular convolution, and then utilizes the orthogonality of the inter-antenna channel matrix to complete the STBC-OFDM symbol detection. For the STBC-OFDM system with two transmissions and one reception, firstly, the data received in the first time slot is eliminated by inter-symbol interference, and the initial approximation of the circular convolution of the two time slots is used, and then the orthogonality of the spatial channel matrix and the frequency domain channel The diagonality of the matrix completes the data detection of the STBC-OFDM system, and finally repairs the cyclic prefix of the two time slot data through iteration, and at the same time eliminates the inter-symbol interference for the received data of the second time slot to improve the accuracy of data detection .

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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