Communication system and its signal detection method
A detection method and signal technology, applied in transmission systems, preventing/detecting errors through diversity reception, digital transmission systems, etc., can solve problems such as error diffusion and deterioration of signal detection performance, and reduce the possibility of misjudgment. Overcoming the effect of error propagation
Inactive Publication Date: 2012-07-25
杨艳利
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This kind of hard decision not only makes the decision error uncorrectable, but also causes error diffusion in the detection of each layer in the future, that is, once a decision error occurs, it will become amplified in the subsequent detection of each signal interference, which seriously deteriorates the detection performance of these signals
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[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0020] The embodiment of the present invention introduces the idea of soft decision when detecting the signal of V-BLAST structure, that is, not only the judgment result is given when the signal is judged in the process of signal detection, but also the judgment result is given. The posterior probability of the outcome occurring. Therefore, a soft-decision V-BLAST algorithm is given to improve the detection performance of V-BLAST.
[0021] In the V-BLAST detection method proposed by the embodiments of the present invention, MIMO signal detection is regarded as a problem of finding a path with the largest posterior probability in an M-level tree. In the detection of each signal, the system reserves the path with a sufficiently high posterior probability, and whe...
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The invention relates to the field of the wireless communication and discloses a communication system and the signal detection method. The invention can be used for the detection of various channels of signals in the V-BLAST structure layer by layer; when the detection is carried out over each layer ahead of the last layer, the posterior probabilities of the paths that various nodes probably formed over the layer are calculated and at least one path meeting the predetermined condition is reserved according to the posterior probabilities of the paths, and the subsequent nodes of various paths reserved over the layer are only detected in the test of the next layer; when the last layer is detected, the path with the maximum posterior probability is output as the final detection result. The invention can realize the performance close to the performance of the maximum likelihood or sphere decoding algorithm with a simpler algorithm.
Description
technical field [0001] The present invention relates to the field of wireless communication, and in particular to signal detection of a vertical layered space-time coding (V-BLAST) structure in a multiple input multiple output (Multiple Input Multiple Output, "MIMO") system. Background technique [0002] With its unique advantages of flexibility and convenience, mobile communication meets people's requirements for communication technology in modern society, and has become the fastest-growing communication method since the mid-1980s. The ever-increasing voice services, data services and broadband Internet services in future mobile communications will put forward higher requirements on the communication system in terms of transmission rate, performance and system service capacity. In order to achieve this goal, it is not enough to use more spectrum resources. For this reason, it is necessary to introduce space resources for wireless signals, that is, to use multiple antennas t...
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IPC IPC(8): H04L1/06H04L1/00
Inventor 刘谦雷麻清华杨绿溪夏林峰
Owner 杨艳利