Signal detection method of vblast-ofdm system under absence of cyclic prefix

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

Inactive Publication Date: 2016-08-03
UNIV OF ELECTRONICS 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 detection method of vblast-ofdm system under absence of cyclic prefix
  • Signal detection method of vblast-ofdm system under absence of cyclic prefix
  • Signal detection method of vblast-ofdm system under absence of cyclic prefix

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Embodiment Construction

[0063] 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:

[0064] 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 is 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 (number of multipath channels) L=5.0e-6 / T=50.

[0065] ...

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Abstract

The invention discloses a signal detection method of a VBLAST-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 uses the zero-forcing criterion or the minimum mean square error criterion to complete the VBLAST-OFDM Symbol detection. For the VBLAST-OFDM system with two transmissions and two receptions, firstly, according to the difference in the channel parameters between the antennas, the first approximation of inter-symbol interference cancellation and circular convolution is performed on the two receiving antennas, and then the zero-forcing criterion or the minimum mean square error criterion is used to analyze the Simplify the channel matrix in the space frequency domain, eliminate inter-carrier interference and inter-antenna interference, and complete the data detection of the VBLAST-OFDM system. Finally, iteratively repair the cyclic prefix of the two receiving antenna data 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 ​​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 the most representative multiple-input multiple-output (MIMO) system, has the advantage of making full use of spatial multiplexing technology to improve spectrum efficiency, and the realized MIMO system can Flexible trade-off between bit error rate (BER) and spectral efficiency. Experiments show that the spectrum utilization rate is high under flat fa...

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Application Information

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Patent Type & Authority Patents(China)
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 ELECTRONICS SCI & TECH OF CHINA
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