Performance comparison of Single Carrier Modulation with frequency domain equalization an OFDM for wireless communications

2009 International Conference on Emerging Technologies Pub Date : 2009-12-11 DOI:10.1109/ICET.2009.5353158

U. Khan, S. Baig, M. Mughal

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引用次数: 5

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) has the inherent problem of high peak to average power ratio (PAPR). Moreover, it suffers from high sensitivity to frequency offsets and narrowband interference (NBI). Contrary to this, Single Carrier Modulation (SCM) offers smaller PAPR and reduced sensitivity to NBI. However, it requires an efficient channel equalization technique. In literature, frequency domain channel equalization has been proposed for SCM systems in wireless communications. It also possesses the advantage of lower complexity in signal processing, as in the case of OFDM. This paper presents performance comparison between OFDM and SCM with frequency domain equalization for multipath wireless channel. SCM utilizes minimum mean square error (MMSE) algorithm for the training of the frequency domain equalizer. It is shown that SCM employing a frequency domain MMSE equalizer has a better bit error rate (BER) performance than OFDM. Also, the performance comparison of SCM and OFDM systems in the presence of NBI over additive white gaussian noise (AWGN) link shows that SCM is less sensitive to NBI.

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基于频域均衡的单载波调制与OFDM无线通信性能比较

正交频分复用(OFDM)存在固有的峰值平均功率比(PAPR)高的问题。此外，它还具有对频率偏移和窄带干扰(NBI)的高灵敏度。与此相反，单载波调制(SCM)提供更小的PAPR和降低对NBI的灵敏度。然而，它需要一种有效的信道均衡技术。在文献中，频域信道均衡已被提出用于无线通信中的单片机系统。与OFDM相比，它还具有信号处理复杂度较低的优点。本文对多径无线信道中采用频域均衡技术的OFDM与单片机的性能进行了比较。单片机采用最小均方误差(MMSE)算法对频域均衡器进行训练。结果表明，采用频域MMSE均衡器的单片机比OFDM具有更好的误码率性能。此外，在加性高斯白噪声(AWGN)链路上，对有NBI存在的SCM系统和OFDM系统的性能进行了比较，结果表明SCM系统对NBI的敏感性较低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2009 International Conference on Emerging Technologies

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