Pre-coding method for use in spatial phase modulation

A spatial phase and precoding technology, applied in the field of MIMO technology, can solve problems such as large impact on system performance, and achieve the effect of improving BER performance

Inactive Publication Date: 2014-11-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

However, in the SM system based on PSK modulation technology, the angle of the channel column vector has a great influence on the performance of the system

Method used

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  • Pre-coding method for use in spatial phase modulation
  • Pre-coding method for use in spatial phase modulation
  • Pre-coding method for use in spatial phase modulation

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Embodiment Construction

[0024] The present invention is described in detail below in conjunction with accompanying drawing

[0025] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions are omitted here.

[0026] 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.

[0027] 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 ( Quad...

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Abstract

The invention belongs to the technical field of communication interference resistance, and particularly relates to a pre-coding method for use in spatial phase modulation. The pre-coding method disclosed by the invention is mainly characterized in that a pre-coding vector is obtained through a receiving end according to an estimated channel matrix H. The method comprises the following specific steps: determining the serial numbers m and n of transmitting antennae corresponding to two constellation points according to the minimum distance between any two points in the constellation diagram of an SM-PSK (Spatial Modulation-Phase Shifting Keying) system; if m is equal to n, directly using theta which is selected at last as an initial vector without adopting remaining algorithms in the step; and if m is unequal to n, setting an angle deviation value deltatheta as 2pi/N, and selecting an optimal vector as a pre-coding vector from a set of alternative pre-coding vectors. The method has the beneficial effects that the minimum Euclidean distance between adjacent constellation points can be expanded, and the BER (Bit Error Rate) performance of the system is improved remarkably under the condition that minimal feedback quantity is introduced into the system and the complexity is increased slightly. The invention is particularly suitable for the pre-coding method for use in the spatial phase modulation.

Description

technical field [0001] The invention belongs to the technical field of communication anti-jamming, and relates to spatial modulation (Spatial Modulation, SM) technology, precoding technology (Transmit Precoding) at the transmitting end, phase rotation technology (Phase Rotation, PR), phase shift keying (Phase Shifting Keying, PSK) ) modulation technology, and its 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 technology is to transmit inform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04B7/04H04L27/20
Inventor 杨平王宇肖悦李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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