Signal detecting method in high-order modulated multi-input multi-output system

Abstract

The invention discloses a signal detection method in a high-order modulated multi-input multi-output system. The method comprises the following steps of: 1. receiving signals; 2. performing preprocess; 3. detecting a bottom index layer; 4. performing presort; 5. performing path extension; 6. selecting preferred paths; 7. selecting suboptimal paths; 8. determining surviving paths; 9. updating index layers; 10. detecting a top index layer; and 11. outputting obtained detection vectors. According to the method provided in the invention, a sorted QR decomposition is adopted to apply triangularization on a real channel matrix and the presort is adopted to determine a sequence in which child nodes ascend according to branch measurement values; when the suboptimal paths is selected, selection results of the preferred paths are adopted to limit the suboptimal paths in a certain range, and therefore, processing on extended paths beyond the range is omitted. With lower complexity, the method provided in invention can complete the signal detection of the high-order M-QAM modulated MIMO system with detection performance guaranteed.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and further relates to a signal detection method of a high-order modulation multiple-input multiple-output (multiple-input multiple-output, MIMO) spatial multiplexing system in the technical field of multiple antennas. The invention can complete the signal detection of the high-order M-QAM modulation MIMO system with relatively low complexity under the condition of ensuring the detection performance. Background technique [0002] MIMO communication system structure is an important means for future mobile communication systems to achieve high spectrum utilization, high speed, and high reliability data transmission. Since multiple transmission data are transmitted in parallel on different antennas in the MIMO communication process, the transmission signals of different transmitting antennas interfere with each other, and more complex detection techniques are required to obtai...

AI Technical Summary

Problems solved by technology

The disadvantage of this patent application is that the number of new paths extended by each surviving path is the same as the number of real constellation points. In the case of high-order modulation, more extended paths need to be processed to complete the detection of the signal, making the detection complexity very high

The disadvantage of this patent application is that in the survival path selection unit, the selected survival path cannot be guaranteed to be optimal among the extension paths of the corresponding layer, and a part of the extension path is actually wasted

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