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Generalized spatial modulation signal detection method based on improved QRD-M algorithm

A generalized spatial modulation and signal detection technology, applied in baseband systems, baseband system components, and shaping networks in transmitters/receivers. question

Active Publication Date: 2016-04-06
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] It can be seen that the traditional QRD-M algorithm is directly applied to GSM signal detection, and the M branch search must be performed on non-GSM invalid transmission signal vectors, which not only increases the computational complexity, but also causes the gap between candidate transmission signal vectors. There is a big gap between the detection performance and the ML detection algorithm due to the reduction of the minimum Euclidean distance

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Embodiment Construction

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] According to the characteristics of GSM, coexistence effective GSM transmission signal vector, and when the traditional QRD-M algorithm is executed to the n=1th layer, there is candidate reserved branches, that is, there are invalid transmit signal vectors belonging to non-GSM. After analysis, this A non-GSM invalid transmit signal vector includes two parts: (1) the number of activated antennas matches (i.e. Where||·|| 0 represents the 0-norm operator), but the invalid transmitted signal vector formed by the redundant antenna combination, total in Indicates the number of redundant antenna combinations; (2) The number of activated antennas does not match (ie ), the total indivual.

[0027] The following is N t = 4, N A =2 for the GSM system as an example for description. If set C all Indicates that it meets N t ...

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Abstract

The invention relates to a generalized spatial modulation signal detection method based on an improved QRD-M algorithm, and belongs to the field of communication technology. The method comprises the following steps: a first step: firstly, making the maximum likelihood (Maximum Likelihood, ML) detection of a GSM signal be equivalent to a search process of an inverted tree structure via QRD; a second step: before carrying out M branch search on each layer of the tree structure, clipping branches corresponding to a redundant antenna combination and branches unmatched with the number of activation antennas by referring tothe properties of the GSM signal, in order to improve the effectiveness of the retained branches of each layer; and a third step: finally, carrying out M branch search on the retained branches of each layer. By adopting the method, the detection complexity of the GSM signal is obviously reduced, and meanwhile, approximate ML detection performance can be obtained at the same time.

Description

technical field [0001] The invention belongs to the technical field of communication and relates to a generalized space modulation signal detection method based on an improved QRD-M algorithm. Background technique [0002] The traditional multiple input multiple output (Multiple Input Multiple Output, MIMO) technology does not need to increase the bandwidth and antenna transmission power, not only can effectively improve the channel capacity, but also reduce the bit error rate. Therefore, the traditional MIMO technology as the physical layer of the fourth generation mobile communication system It is one of the key technologies and has been accepted by various standard organizations at home and abroad. However, with the development of technology, traditional MIMO technology has encountered problems such as synchronization between antennas, interference between antennas at the receiving end, and the need for a large number of radio frequency units. To this end, MeslehR et al....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L25/03216
Inventor 景小荣王明月周围
Owner CHONGQING UNIV OF POSTS & TELECOMM