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Optimal power distribution method for SM-OFDM system under imperfect channel estimation

A technology of SM-OFDM and channel estimation, which is applied in the field of optimal power allocation of SM-OFDM systems under imperfect channel estimation, and can solve problems such as reducing system transmission efficiency and system performance

Inactive Publication Date: 2016-07-27
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0003] The channel estimation error of the SM-OFDM system will affect the receiver's detection accuracy of the signal and reduce the system performance. Usually, the number of pilots is increased to improve the accuracy of channel estimation, but it will reduce the system transmission efficiency

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  • Optimal power distribution method for SM-OFDM system under imperfect channel estimation
  • Optimal power distribution method for SM-OFDM system under imperfect channel estimation
  • Optimal power distribution method for SM-OFDM system under imperfect channel estimation

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Embodiment Construction

[0062] The present invention will be described in further detail below with reference to the embodiments and accompanying drawings, so that those skilled in the art can better understand the present invention. 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.

[0063] SM-OFDM system: such as figure 1 As shown, the data before spatial modulation is the bit data b to be transmitted, which can be regarded as an m×N matrix, where N is the number of subcarriers in the OFDM system, m=log2(N t )+log2(M) is the number of bits carried by one SM modulation symbol, and M 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 modu...

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Abstract

The invention belongs to a field of communication anti-jamming technique and specifically provides an optimal power distribution method for an SM-OFDM (Spatial Modulation-Orthogonal Frequency Division Multiplex) system under imperfect channel estimation. According to the method, a receiving terminal obtains system BER (Bit Error Rate) upper bound according to an estimated channel so as to obtain an optimal power distribution scheme. The method specifically includes steps of obtaining an estimation channel of data sub carriers by adopting an eta-order generalized linear interpolation technology according to the estimation channels of eta pilot frequency sub channels which are the nearest to the data sub channels; calculating the average BER upper bound union set bound of the data sub carriers; and finally obtaining the optimal power distribution scheme between a pilot frequency symbol and a data symbol through minimizing the BER upper bound. In a condition of limited total power, the BER performance of the SM-OFDM system can be improved distinctively without computation complexity increase. The method provided by the invention is suitable for all the generalized linear interpolation technologies.

Description

technical field [0001] The present invention belongs to the technical field of communication anti-jamming, relates to spatial modulation (SpatialModulation, SM) technology, orthogonal frequency division multiplexing technology (Orthogonal Frequency Division Multiplex, OFDM), channel estimation technology, and related SM-OFDM technology, specifically a kind of Optimal power allocation method for SM-OFDM systems under perfect channel estimation. Background technique [0002] Multiple Input Multiple Output (Multiple Input Multiple Output, MIMO) technology is a high-speed transmission technology in a wireless environment. It configures more antenna units at the transmitter and receiver, and combines advanced space-time coding and modulation schemes. Fully utilized, can bring additional diversity, multiplexing and beamforming gain. SM technology is a high-efficiency and low-complexity MIMO modulation scheme, which can use the antenna index of the transmitted data to carry additi...

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Application Information

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IPC IPC(8): H04L5/00H04L25/02H04L25/03
CPCH04L5/0007H04L5/0023H04L5/006H04L25/022H04L25/0224H04L25/025H04L25/03159H04L27/261H04L2025/03414
Inventor 喻凤雷霞蒋兆翔和禄肖悦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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