Signal detecting method of VBLAST-OFDM system under condition of shortage of cyclic prefix

A VBLAST-OFDM, cyclic prefix technology used in wireless and mobile communications

Inactive Publication Date: 2013-08-21
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, these methods are only used in single-transmit and single-receive systems. For the two-transmit and double-receive VBLAST-OFDM system, few authors have analyzed the detection methods in this case.

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  • Signal detecting method of VBLAST-OFDM system under condition of shortage of cyclic prefix
  • Signal detecting method of VBLAST-OFDM system under condition of shortage of cyclic prefix
  • Signal detecting method of VBLAST-OFDM system under condition of shortage of cyclic prefix

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Embodiment Construction

[0065] Below in conjunction with specific parameters, the VBLAST-OFDM symbol detection method under the absence of the above-mentioned cyclic prefix proposed by the present invention is described:

[0066] The parameters of the VBLAST-OFDM system in this example are set as follows: set the antenna parameters as two transmissions and two receptions, the signal modulation method adopts QPSK modulation, the total number of subcarriers N=1024, and the subcarrier numbers are [0,1,2,.... ,1023]. The channel parameters selected in this example are as follows: the spatial channels use independent Rayleigh fading channels, each channel uses a COST207TU channel, and the multipath delays are [0, 0.2, 0.5, 1.6, 2.3, 5]us, multi- The path fading powers are [3, 0, 5, 6, 8, 10] dB respectively, the normalized Doppler spread value is 0.001, and the system sampling period T=1.0e-7s. Then the normalized channel maximum multipath delay (the number of multipath channels) L=5.0e-6 / T=50.

[0067]...

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Abstract

The invention discloses a signal detecting method of a VBLAST-OFDM system under the condition of shortage of a cyclic prefix, and belongs to the technical field of wireless communication. Inter-symbol interference and reconfiguration of cyclic convolution are removed, so that an OPDM transmitting system is divided into N equal gauss channels which are concurrent and different in gain, and then a zero-forcing standard or a minimum mean square error standard is used for completing detection to a VBLAST-OFDM symbol. Directing at the VBLAST-OFDM system which conducts twice sending and twice reception, according to the difference of information channel parameters between antennas, inter-symbol interference elimination and the initial approximation of the cyclic convolution are conducted on two receiving antennas respectively, then the zero-forcing standard or the minimum mean square error standard is used for conducting simplification on a space frequency domain channel matrix, inter-carrier interference and inter-antenna interface are removed, data detection to the VBLAST-OFDM system is completed, finally the cyclic prefix of the data of the two receiving antennas is repaired through iteration, and precision of data detection 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 ​​missing in a VBLAST-OFDM system, and further performing inter-symbol interference elimination and cyclic prefix reconstruction through iteration. The repair of cyclic prefix reconstruction, and then the signal detection method to achieve ideal detection performance. Background technique [0002] Vertical Bell Laboratories Layered Space Time (VBLAST) technology, as one of the most representative multiple-input multiple-output (MIMO) systems, has the advantage of making full use of spatial multiplexing technology to improve spectrum efficiency, and The implemented MIMO system is capable of a flexible trade-off between bit error rate (BER) and spectral efficiency. Experiments show that the spectrum utilization rat...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04L27/26H04L1/06
Inventor 雷霞曹海波孔昭富乐荣臻李垠泽
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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