HARQ Throughput Performance of OFDM / TDM Using MMSE-FDE in a Frequency-selective Fading Channel

HARQ Throughput Performance of OFDM / TDM Using MMSE-FDE in a Frequency-selective Fading Channel
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在频率选择性衰落信道中使用 MMSE-FDE 的 OFDM/TDM 的 HARQ 吞吐量性能

DOI:
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发表时间:
2008
期刊:
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影响因子:
--
通讯作者:
F. Adachi
F. Adachi
中科院分区:
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文献类型:
--
作者:
H. Gačanin;F. Adachi

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吞吐量是无线信道上数据通信的重要性能度量。在频率选择性衰落信道下,结合混合自动重传请求(HARQ)的正交频分复用(OFDM)技术可以获得良好的吞吐量性能。然而,在具有HARQ的OFDM中,在第一传输期间,传输未编码的信息分组。因此,信道的频率选择性不能被利用,因为频域均衡(FDE)不是为了利用信道优势而设计的。特别地,即使对于高信噪比功率比(SNR),OFDM的HARQ吞吐量性能也不能得到改善。在本文中,以增加传统OFDM的HARQ吞吐量,我们提出了使用OFDM与时分复用(OFDM/TDM)结合使用最小均方误差FDE(MMSE-FDE),旨在利用信道的频率选择性。计算机仿真表明,由于首次传输期间的频率分集增益,使用MMSE-FDE和HARQ的OFDM/TDM比传统OFDM获得了更高的吞吐量。在频率选择性衰落较强的信道中,采用MMSE-FDE的OFDM/TDM系统具有更好的性能。
Throughput is an important performance measure for data communications over a wireless channel. Orthogonal frequency division multiplexing (OFDM) with hybrid automatic repeat request (HARQ) achieves a good throughput performance over a frequency-selective fading channel. In OFDM with HARQ, however, during the first transmission uncoded information packet is transmitted. Consequently, the channel frequencyselectivity cannot be exploited since frequency-domain equalization (FDE) is not designed to take the channel advantages. In particular, the HARQ throughput performance of OFDM cannot be improved even for a high signal-to-noise power ratio (SNR). In this paper, to increase the HARQ throughput of conventional OFDM, we present the use of OFDM combined with time division multiplexing (OFDM/TDM) using minimum mean square error FDE (MMSE-FDE) designed to exploit the channel frequency-selectivity. It was shown, by computer simulation, that OFDM/TDM using MMSE-FDE with HARQ achieves a higher throughput than the conventional OFDM due to frequency diversity gain during the first transmission. It was also shown that OFDM/TDM using MMSE-FDE performs better in a stronger frequency-selective fading channel.
DOI: 10.1109/35.995852
发表时间: 2002-04-01
影响因子: 11.2
作者:
Falconer, D;Ariyavisitakul, SL;Eidson, B
通讯作者: Eidson, B
当这些话被说出时...(I)
DOI: --
发表时间: 2004
期刊: 西洋精神史における言語観の変遷(松田隆美編)(慶應義塾大学出版会)
影响因子: --
作者:
斎藤慶典
通讯作者: 斎藤慶典