A time inversion and symbol time compression (TI-STC) scheme for ICI cancellation in high mobility OFDM systems

2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC) Pub Date : 2017-12-01 DOI:10.1109/JEC-ECC.2017.8305779

Mohammed. S. El-Bakry, Hamed. A. El-Shenawy, A. Ammar

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引用次数: 9

Abstract

Conventional orthogonal frequency division multiplexing (OFDM) systems suffers from loss of orthogonality due to channel time variations. This leads to inter-carrier interference (ICI) which degrades the system performance. In this paper, the time inversion and symbol time compression (TI-STC) scheme is proposed for ICI cancellation in high mobility OFDM systems. The proposed TI-STC scheme includes time inversion (TI) process and symbol time compression (STC) process. The proposed TI-STC scheme alleviates ICI without loss of the system throughput compared to Frank's windowing scheme. The proposed TI-STC scheme operates efficiently up to 40% of normalized Doppler frequency compared to Frank's windowing scheme. The proposed TI-STC scheme is investigated in digital video broadcasting terrestrial-2 (DVB-T2) system under COST 207 typical rural (Ru) environment multi-path fading channel for BPSK modulation scheme. The numerical results show that the proposed TI-STC scheme improves the BER performance compared to Frank's windowing scheme.

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一种用于高移动性OFDM系统中ICI对消的时间反转和符号时间压缩(TI-STC)方案

由于信道时间的变化，传统的正交频分复用(OFDM)系统存在正交性损失。这将导致载波间干扰(ICI)，从而降低系统性能。针对高迁移率OFDM系统中的ICI对消问题，提出了时间反演和符号时间压缩(TI-STC)方案。所提出的TI-STC方案包括时间反演(TI)过程和符号时间压缩(STC)过程。与Frank的开窗方案相比，本文提出的TI-STC方案在不损失系统吞吐量的情况下减轻了ICI。与Frank的加窗方案相比，TI-STC方案的运行效率高达归一化多普勒频率的40%。在COST 207典型农村(Ru)环境下的多径衰落信道BPSK调制方案中，研究了所提出的TI-STC调制方案。数值结果表明，与Frank的加窗方案相比，TI-STC方案提高了误码率。

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2017 Japan-Africa Conference on Electronics, Communications and Computers (JAC-ECC)

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