在AWGN和SUI1通信信道上采用不同保护时间间隔改善Wimax系统的BER性能以最小化ISI和ICI的影响的比较研究
Comparative Study of Different Guard Time Intervals to Improve the BER Performance of Wimax Systems to Minimize the Effects of ISI and ICI under Adaptive Modulation Techniques over SUI1 and AWGN Communication Channels
摘要：
基于空中接口标准802.16无线城域网的WIMAX技术以与传统蜂窝网络相同的方式配置，其中基站使用点对多点架构，以在高达几公里的半径上驱动服务。WIMAX的范围和非视距（NLOS）能力使该系统对用户非常有吸引力，但在低信噪比下会有略高的误码率。本文的目的是比较研究不同的保护时间间隔改善BER在不同的SNR下的数字调制技术（QPSK，16 QAM和64 QAM）和不同的通信信道AWGN和衰落信道斯坦福大学中期（SUI 1）的WIMAX系统。将研究在FEC信道编码中与具有卷积编码器（半）额定码的Reed-Solomon（RS）编码器的这些效果之间的比较。出错率仿真结果表明，在AWGN信道下QPSK调制技术下，采用（255，239，8）RS码与半额定卷积码（0.25保护间隔）交织的方法在Wimax通信系统中具有很好的抗干扰能力。为了在基于Wimax的系统中完成该性能分析，使用音频信号片段进行分析。在噪声环境下，传输的音频信息被发现已被有效地检索。
英文摘要：
The WIMAX technology based on air interface standard 802.16 wireless MAN is configured in the same way as a traditional cellular network with base stations using point to multipoint architecture to drive a service over a radius up to several kilometers. The range and the Non Line of Sight (NLOS) ability of WIMAX make the system very attractive for users, but there will be slightly higher BER at low SNR. The aim of this paper is the comparative study of different guard time intervals effect for improving BER at different SNR under digital modulation (QPSK, 16QAM and 64QAM) techniques and different communication channels AWGN and fading channels Stanford University Interim (SUI 1) of an WIMAX system. The comparison between these effects with Reed-Solomon (RS) encoder with Convolutional encoder (half) rated codes in FEC channel coding will be investigated. The simulation results of estimated Bit Error Rate (BER) displays that the implementation of interleaved RS code (255,239,8) with (half) rated Convolutional code of 0.25 guard time intervals under QPSK modulation technique over AWGN channel is highly effective to combat in the Wimax communication system. To complete this performance analysis in Wimax based systems, a segment of audio signal is used for analysis. The transmitted audio message is found to have retrieved effectively under noisy situation.
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