利用无保护间隔的MMSE均衡提高多用户分集OFDMA的吞吐量性能

Y. Ida, C. Ahn, T. Kamio, H. Fujisaka, K. Haeiwa
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引用次数: 2

摘要

近年来,为了在无线通信系统中实现高数据速率和高质量的多媒体业务,正交频分复用技术(OFDM)受到了广泛的关注和研究。此外,OFDM和FDMA相结合的正交频分多址(OFDMA)为每个用户提供可用子载波数量的一小部分。用户之间存在的分集称为多用户分集,发送方可以利用这种分集来增强无线网络的容量。在多用户分集OFDMA中,利用信道波动分集本质上是通过选择具有强子载波信道的用户来实现的。因此,多用户分集技术有望显著提高系统吞吐量和频谱效率。在多径衰落环境中,由于信道的频率选择性,信号幅度的严重衰落和码间干扰(ISI)会导致错误性能的不可接受的下降。在OFDM系统中,通过插入大于信道延迟扩展的保护间隔(GI)来消除ISI。另一方面,该操作降低了吞吐量性能。在本文中,我们提出了提高无GI的多用户分集OFDMA的吞吐量性能的方法。在此之前,我们已经提出了ISI和载波间干扰(ICI)补偿方法。此外,最小均方误差(MMSE)均衡可以抑制ISI和ICI引起的噪声增强。因此,我们采用这些方法来消除ISI和ICI,并尝试提高吞吐量性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Throughput performance enhancement for multiuser diversity OFDMA using MMSE equalization without guard interval
In recent year, to achieve a high data rate and high quality multimedia service in wireless communication systems, orthogonal frequency division multiplexing (OFDM) is attractive and widely studied. Moreover, orthogonal frequency division multiple access (OFDMA) which is combined OFDM and frequency division multiple access (FDMA) provides each user with a fraction of the available number of subcarriers. The diversity that exists between users is called multiuser diversity and can be exploited by the sender to enhance the capacity of wireless network. In a multiuser diversity OFDMA, exploiting channel fluctuation diversity is in essence done by selecting the user with the strong subcarrier channels. Therefore, the multiuser diversity techniques promise dramatically increased system throughput and spectral efficiency. In multipath fading environment, severe fading of the signal amplitude and intersymbol interference (ISI) due to the frequency selectivity of the channel cause an unacceptable degradation of error performance. In an OFDM system, ISI is eliminated by inserting guard interval (GI) longer than the delay spread of the channel. On the other hand, this operation is degraded the throughput performance. In this paper, we propose to improve the throughput performance for multiuser diversity OFDMA without GI. Previously, we have proposed ISI and inter-carrier interference (ICI) compensation method. In addition, the minimum mean square error (MMSE) equalization can suppress the noise enhancement due to ISI and ICI. Therefore, we employ these methods to eliminate ISI and ICI and try to improve the throughput performance.
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