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首页> 外文期刊>International Journal of Computer Networks & Communications >Comparison between Performances of Channel estimation Techniques for CP-LTE and ZP-LTE Downlink Systems
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Comparison between Performances of Channel estimation Techniques for CP-LTE and ZP-LTE Downlink Systems

机译：CP-LTE和ZP-LTE下行链路系统的信道估计技术性能之间的比较

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In this paper, we propose to evaluate the performance of channel estimation techniques for Long Term Evolution (LTE) Downlink systems based on Zero Padding technique (ZP) instead of Cyclic Prefixing (CP). LTE Downlink system is a multiuser system based on a MIMO-OFDMA technology. Usually, in OFDM systems, a guard interval is inserted in order to mitigate both inter-carrier interference (ICI) and inter-symbol interference (ISI). LTE Downlink systems are based on CP-OFDM technique which consists of a copy a last OFDM symbols inserted at the beginning of each transmitted OFDM symbol. Although this technique shows good performances, the CP-LTE system suffers from a power efficiency loss. With the number of present OFDM symbols in LTE Downlink radio frame, the bandwidth loss becomes more important. Instead of CP, we propose to evaluate the performance of ZP-LTE systems in order to avoid the power efficiency .In this paper, we interest to evaluate the performance of channel estimation techniques for the two LTE Downlink systems. Simulations results show that although ZP-LTE systems outperform CP-LTE Downlink systems in terms of power efficiency, the CP-LTE systems show better performance than ZP-LTE systems and especially for high SNR values. MATLAB Monte–Carlo simulations are used to evaluate the performance of LS, LMMSE and Lr-LMMSE estimators in terms of Mean Square Error (MSE) and Bit Error Rate (BER) for 2x2 LTE Downlink systems.
机译：在本文中，我们建议评估基于零填充技术（ZP）而非循环前缀（CP）的长期演进（LTE）下行链路系统的信道估计技术的性能。 LTE下行链路系统是基于MIMO-OFDMA技术的多用户系统。通常，在OFDM系统中，插入保护间隔是为了减轻载波间干扰（ICI）和符号间干扰（ISI）。 LTE下行链路系统基于CP-OFDM技术，该技术由复制的OFDM符号组成，该符号插入每个传输的OFDM符号的开头。尽管该技术表现出良好的性能，但是CP-LTE系统遭受功率效率损失。随着LTE下行链路无线电帧中当前OFDM符号的数量增加，带宽损失变得更加重要。为了避免功率效率，我们建议代替CP来评估ZP-LTE系统的性能。在本文中，我们希望评估两个LTE下行链路系统的信道估计技术的性能。仿真结果表明，尽管在功率效率方面ZP-LTE系统优于CP-LTE下行系统，但CP-LTE系统表现出比ZP-LTE系统更好的性能，尤其是在高SNR值的情况下。 MATLAB Monte-Carlo仿真用于根据2x2 LTE下行链路系统的均方误差（MSE）和误码率（BER）来评估LS，LMMSE和Lr-LMMSE估计器的性能。

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