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Low-complexity differential spatial modulation detection algorithm

A technology of spatial modulation and detection algorithm, applied in the field of communication, can solve the problem of high complexity, achieve the effect of reducing complexity, reducing the influence of modulation order, and increasing the number of information bits

Active Publication Date: 2016-01-13
CHINA JILIANG UNIV
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Problems solved by technology

Differential Maximum Likelihood Detection Algorithm (DSM-ML) was proposed as the detection algorithm with the best performance, but its complexity is very high due to its traversal search method

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  • Low-complexity differential spatial modulation detection algorithm

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Embodiment Construction

[0031] A low-complexity differential space modulation detection algorithm adopted by the present invention is as follows: firstly, a bit filling scheme and a transmission bit calculation formula are used to construct a symbol matrix at the transmitting end of the differential space modulation system, and the signal is transmitted after differential changes. Obtain the received signal (received signal is a matrix of Nr×Nt), and then based on the calculation structure of the differential maximum likelihood detection algorithm, the receiving matrix is ​​searched by column detection, and the signal judgment is performed column by column to obtain the modulation symbol and transmission The serial number of the antenna is finally inversely mapped to information bits.

[0032] Further, the transmitting end of the differential space modulation system is set as an Nt×Nt-dimensional symbol matrix, and the calculation formula for the possible number of the Nt×Nt-dimensional symbol matrix is:...

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Abstract

The invention provides an LC-DSM algorithm (low-complexity differential detection algorithm). Firstly, a symbolic matrix is constructed at the transmitting end of a differential spatial modulation system by applying a bit filling scheme and a transmission bit calculation formula, and a receiving signal is obtained at the receiving end through differential transformation and transmitting. Then a search mode of detection by column is adopted on a receiving matrix based on the equation structure of a differential maximum likelihood detection algorithm to perform signal decision column by column so that a transmitting symbol and the sequence number of a transmitting antenna are obtained. Finally information bits are obtained through inverse mapping according to the corresponding relation of the bit and the transmitting symbol and the bit and the sequence number of the transmitting antenna. The method is obtained by combination of the low-complexity detection algorithm under spatial modulation and the equation structure formed by the maximum likelihood detection algorithm under the differential spatial modulation system. The research indicates that complexity is greatly reduced relative to the differential maximum likelihood detection algorithm by using the LC-DSM algorithm under the premise of guaranteeing no loss of algorithm performance.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a transmission method and a signal detection method at the transmitting end of a wireless communication system, and in particular to a low-complexity detection algorithm for a spatial modulation system. Background technique [0002] Multiple input multiple output (MIMO: multiple input multiple output) technology can improve the capacity and spectrum utilization of wireless communication systems by using multiple transmitting and receiving antennas. However, due to the limitation of its system structure, interference between transmission channels and strict synchronization of multi-antenna transmission have become the two main reasons restricting its development. In this case, spatial modulation (SM: spatial Modulation) is proposed as a new MIMO transmission method. In each transmission time slot of the system, only one transmitting antenna is activated to transmit data....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B7/04H04L1/00
Inventor 金小萍文思杰
Owner CHINA JILIANG UNIV
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