Iterative MMSE soft detection method based on spatial modulation system having frequency offset

A technology of spatial modulation and soft detection, applied in the field of MIMO technology, can solve problems such as the inability to completely eliminate interference system performance

Inactive Publication Date: 2017-02-01
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, a large number of simulation practices have proved that these technologies are not suitable for SM-OFDM systems, because compared with MIMO-OFDM systems, the channel matrix of SM-OFDM systems does not satisfy the full rank
Recently, the ML-based iterative interference cancellation (PIC) method has been proposed, but because the interference items in PIC are always related to the transmitted signal, the interference cannot be completely eliminated to improve the performance of the system.

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  • Iterative MMSE soft detection method based on spatial modulation system having frequency offset
  • Iterative MMSE soft detection method based on spatial modulation system having frequency offset
  • Iterative MMSE soft detection method based on spatial modulation system having frequency offset

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] In order to describe the present invention better, the terms used in the technical solution of the present invention and the transmitter structure of the spatial modulation system are introduced first.

[0034] Spatial modulation: eg figure 1 , b is the bit data that needs to be transmitted, and can be regarded as a matrix of L×T, wherein L=log2(M)+log2(Mary) is the number of bits carried by an SM modulation symbol, and Mary is the quadrature amplitude modulation ( Quadrature Amplitude Modulation, QAM) order. It can be seen that the number of bits that can be carried by one SM modulation symbol is jointly determined by the QAM modulation order and the number of transmit antennas. The SM modulation criterion is to convert b into an M×T matrix x according to the SM conversion table. In x, one column represents the data sent at one time, and any column...

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Abstract

The invention belongs to the technical field of communication anti-interference, and relates to spatial modulation (Spatial Modulation, SM) technology, minimum mean square error (Minimum Mean Square Error, MMSE) technology, and related MIMO (Multiple Input Multiple Output) technology. The invention provides a new MMSE soft detection algorithm based on an SM-OFDM system. According to the technology, the coefficient of an MMSE detector is theoretically calculated, soft information and external information of an iterative detector are solved by prior information LLR, and to-be-detected data is iteratively updated, so that the BER perform ace of the system is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of communication anti-jamming, and relates to spatial modulation (Spatial Modulation, SM) technology, minimum mean square error technology (Minimum Mean Square Error, MMSE), and related MIMO (Multiple Input Multiple Output) technology. Background technique [0002] MIMO modulation technology is a high-speed transmission technology in a wireless environment. It configures more antenna units at the transmitting end and / or receiving end, and combines advanced space-time coding modulation schemes. By making full use of the degree of freedom of space, it can Brings additional diversity, multiplexing and beamforming gains. [0003] Recently, SM technology has been proposed as a new modulation technique as a new MIMO modulation scheme. The basic principle of this technique is to modulate the antenna index value for the transmission of information bits by activating different antennas. The essence of this transmis...

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Application Information

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IPC IPC(8): H04L1/00H04L25/03
CPCH04L1/005H04L25/03318H04L2025/03617
Inventor 朱媛媛赵岩肖悦李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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