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Position pattern design method for pilot frequency pattern modulation system

A pilot pattern and modulation system technology, applied in the field of pilot pattern mapping optimization and activation of sub-carrier position grouping, can solve problems such as reducing the peak-to-average ratio of OFDM systems, and achieve the effect of improving bit error rate performance

Active Publication Date: 2019-03-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At the same time, due to the sparse nature of the frequency domain signal, the peak-to-average ratio of the OFDM system is reduced

Method used

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  • Position pattern design method for pilot frequency pattern modulation system
  • Position pattern design method for pilot frequency pattern modulation system
  • Position pattern design method for pilot frequency pattern modulation system

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Embodiment

[0027] The specific implementation of the present invention will be introduced below by taking (L, k)=(4,2), the total number of subcarriers N=1024, the cyclic prefix CP=64, and the modulation symbol using BPSK as an example.

[0028] First, determine the system parameters. The total number of subcarriers N=1024, which is divided into G=N / L=256 sub-blocks, each sub-block has L=4 sub-carriers, and the number of sub-carriers k=2 activated for sending constellation point symbols is used Since the number of subcarriers L-k=2 for transmitting pilots, the modulation order M=2. For any subblock, the index bits are bit, modulation bit is p 2 =k·log 2 M = 2 bits. Record this system as (4,2) SIM-OFDM system.

[0029] Second, select the optimal mapping scheme for the (4,2) SIM-OFDM system:

[0030] Step 1: Calculate the active subcarrier combination space: select the number of elements n in the space Φ of 2 active subcarrier combinations from 4 subcarriers Φ =C(L,k)=C(4,2)=6, Φ={...

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Abstract

The invention belongs to the technical field of communication interference resistance, and relates to a position pattern design method for a pilot frequency pattern modulation system. The invention, based on the purpose of improving the error performance of the system, provides a pilot frequency pattern mapping optimization activated subcarrier position grouping method for an SIM-OFDM system. According to the method, when channel information is unknown, Euclidean distances between all possible transmitting symbols are measured to select out an index bit mapping set with the lowest error code probability, and corresponding sub-carriers are activated according to index bits during index modulation so as to improve the system performance.

Description

technical field [0001] The invention belongs to the technical field of communication anti-jamming, relates to a position pattern design method in a pilot pattern modulation system, and more specifically relates to a method for subcarrier index modulation orthogonal frequency division multiplexing (Subcarrier Index Modulation Orthogonal Frequency Division) Multiplexing, SIM-OFDM) system pilot pattern mapping optimization activation subcarrier position grouping method. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is a multi-carrier transmission technology in the field of wireless communication. In recent years, with the rapid development of digital signal processing technology, OFDM technology is Due to good multipath fading ability, simple hardware and low cost, it has been widely used in the field of mobile communication. The basic principle of OFDM is to convert the high-speed data stream into a low-speed data stream transmitte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00H04L27/32
CPCH04L5/0048H04L27/2613H04L27/2628H04L27/32
Inventor 但黎琳蒋婷敏尤花征
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA