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Signal detection method and device for multiple-input-multiple-output wireless communication system

A wireless communication system and signal detection technology, applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problem that linear detection cannot provide satisfactory detection performance, etc.

Inactive Publication Date: 2010-03-17
FUDAN UNIV
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Problems solved by technology

However, due to factors such as error propagation and noise amplification, linear detection cannot provide satisfactory detection performance.

Method used

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  • Signal detection method and device for multiple-input-multiple-output wireless communication system
  • Signal detection method and device for multiple-input-multiple-output wireless communication system
  • Signal detection method and device for multiple-input-multiple-output wireless communication system

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Embodiment Construction

[0045] Specific embodiments of the present invention will be described in detail with reference to the drawings.

[0046] refer to figure 1 , the invention is used for MIMO signal detection in a MIMO-OFDM wireless communication system. The original code is modulated by signal modulation 10 to a specific constellation pattern; serial-to-parallel conversion 11 converts the serial data stream into N parallel data streams; inverse fast Fourier transform (IFFT) 12 completes OFDM modulation; modulated data is inserted into a guard interval After 13, send through antenna 14. The received data undergoes OFDM demodulation by Fast Fourier Transform (FFT) 16 after the guard interval 15 is removed. The MIMO signal detector 18 uses the channel estimate 17 information to detect the demodulated signal. Parallel-to-serial conversion 19, signal demodulation 110 to restore the original code stream.

[0047] refer to figure 2 , the 4×4QPSK / 16-QAM MIMO signal detection device implemented in...

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Abstract

The invention belongs to the technical field of wireless communication, in particular relating to a signal detection method and a device for a multiple-input-multiple-output wireless communication system. In the invention, the received signal vectors and the estimated channel information are used for detecting and recovering the sent signal vectors. The device of the invention comprises a preprocessing unit, a group of K-Best processing units and a group of zero-forcing processing units, wherein the preprocessing unit carries out real number decomposition and QR decomposition on a channel matrix to form a tree search process; the K-Best processing units extend all child nodes of the reserved father node at the upper layer and calculate the Euclidean distance, and finally, K nodes with theminimum Euclidean distance are reserved and transferred to the next layer; and the zero-forcing processing units extend the child nodes with the minimum Euclidean distance increment in the reserved father node at the upper layer. In addition, a generation technology to be selected, a candidate value sharing structure, a shifting technology, and the like, are adopted. The invention reduces the computation complexity of the MIMO signal detection and increases the speed of the MIMO signal detection.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a signal detection method and device applied in a multi-input multi-output wireless communication system Background technique [0002] At present, short-distance wireless communication technology has entered an unprecedented development period. With the improvement of living standards, people put forward higher and higher requirements for the transmission rate of wireless communication systems, such as: wireless high-definition video transmission, high-speed download of massive files, etc. Spectrum resource is the most precious and scarce resource in wireless communication. How to improve the effective utilization of spectrum is a key topic in the field of wireless communication. Multiple-Input-Multiple-Output (MIMO) technology can use the space diversity effect in the same frequency spectrum to generate independent parallel wireless channels and trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L25/03H04L27/26
Inventor 任俊彦刘亮马小晶李凯叶凡许俊李宁
Owner FUDAN UNIV
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