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首页> 外文期刊>Wireless personal communications: An Internaional Journal >An Adaptive Timing Synchronization Scheme for Multi-Band Orthogonal Frequency Division Multiplexing Based Ultra-Wideband Communication Systems
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An Adaptive Timing Synchronization Scheme for Multi-Band Orthogonal Frequency Division Multiplexing Based Ultra-Wideband Communication Systems

机译：基于多频带正交频分复用的超宽带通信系统的自适应定时同步方案

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This article deals with a new energy based adaptive timing synchronization scheme (ATS) which estimates the symbol timing information within two (2) OFDM symbols and updates the information with different frequency bands (adaptive in sense) in a multi-band orthogonal frequency division multiplexing (MB-OFDM) based system. The new approach provides significant improvement in system performance for high delay spread ultra-wideband (UWB) channel model (CM) environments where fast and low-complexity timing synchronization is a critical issue. This paper also addresses a crucial aspect of UWB channel which is frequency dependent delay characteristics. This effect contributes to different dispersion and timing shift of an UWB signal for different frequency bands. In this work, the wideband channel delay characteristics are studied and delay parameters are found considerably different over frequency bands 3.1-4.6 GHz. Based on this observation, the ATS which estimates and maintains the timing delays of each band separately is presented. The performance of ATS algorithm is measured by mean-squared error (MSE), synchronization probability, signal to interference ratio (SIR) reduction due to synchronization errors and bit error rate (BER) through the computer simulation for several UWB CM environments CM2-CM4. Each of these UWB CMs is simulated for 100,000 noisy channel realizations for both coded and uncoded MB-OFDM system. It is shown that ATS gives signal-to-noise ratio (SNR) improvement of 1.1 dB at BER of 1 × 10~(-3), 1.2dB at BER of 2 × 10~(-4), and 0.7dB at BER of 2 × 10~(-4) for CM4, CM3, and CM2 respectively for coded MB-OFDM system over a non-adaptive synchronization scheme [Yak et al., Proceedings of IEEE PIMRC, Berlin, Germany, vol 1, pp 471-475, September 11-14, 2005].
机译：本文介绍了一种新的基于能量的自适应定时同步方案（ATS），该方案可估计两（2）个OFDM符号中的符号定时信息，并在多频带正交频分复用中更新具有不同频带（在意义上自适应）的信息。 （MB-OFDM）系统。对于快速和低复杂度时序同步是关键问题的高延迟扩展超宽带（UWB）信道模型（CM）环境，新方法可以显着改善系统性能。本文还讨论了UWB信道的一个关键方面，即与频率有关的延迟特性。对于不同的频带，这种影响导致UWB信号的不同的色散和定时偏移。在这项工作中，研究了宽带信道的延迟特性，发现延迟参数在3.1-4.6 GHz频带上有很大不同。基于这种观察，提出了分别估计和保持每个频带的定时延迟的ATS。通过计算机模拟几个UWB CM环境CM2-CM4，通过均方误差（MSE），同步概率，由于同步误差和误码率（BER）引起的信噪比（SIR）降低来衡量ATS算法的性能。这些UWB CM中的每一个都针对已编码和未编码的MB-OFDM系统的100,000个噪声信道实现进行了仿真。结果表明，ATS在BER为1×10〜（-3）时提高了1.1 dB的信噪比（SNR），在BER 2×10〜（-4）时提高了1.2dB，在BER时提高了0.7dB非自适应同步方案上分别用于编码MB-OFDM系统的CM4，CM3和CM2的2×10〜（-4）[Yak等人，IEEE PIMRC会议录，德国柏林，第1卷，第471页-475，2005年9月11日至14日]。

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