Experimental Evaluations on Throughput Performance of Adaptive Modulation and Channel Coding and Hybrid ARQ in HSDPA(Special Section on Multi-dimensional Mobile Information Networks)
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概要
- 論文の詳細を見る
This paper presents laboratory experimental results on the throughput performance when key techniques such as adaptive modulation and channel coding (AMC) and hybrid automatic repeat request (ARQ) with packet combining are employed by an implemented transceiver based on the High-Speed Downlink Packet Access (HSDPA) air interface in a multipath fading channel. In AMC operation, we applied four modulation and coding schemes (MCSs): MCS1 (QPSK data modulation with the channel coding rate of R = 1/2, hereafter simply referred to as QPSK with R = 1/2), MCS2 (QPSK with R = 3/4), MCS3 (16QAM with R = 1/2), and MCS4 (16QAM with R = 3/4). The results elucidate that a peak average throughput above 5.0 Mbps is achieved at the average received signal energy per chip-to-background noise power spectrum density ratio (E_c/N_0) of more than approximately 20dB in a one-path fading channel; nevertheless, the achievable peak throughput becomes approximately 2.9 (2.6) Mbps due to severe multipath interference (MPI) in a two-path fading channel where the average signal power of the second path is 6 (3) dB lower than that of the first path, assuming nine-code-channel multiplexing with the fading maximum Doppler frequency of f_D = 5 Hz. Furthermore, we clarify that although the throughput performance employing Type-II hybrid ARQ (i.e., Incremental redundancy) is almost the same as that employing Type-I hybrid ARQ with packet combining (i.e., Chase combining) in a two-path fading channel, Incremental redundancy exhibits superiority over Chase combing in a one-path fading channel for a high Doppler frequency channel such as f_D = 80 Hz.
- 社団法人電子情報通信学会の論文
- 2003-07-01
著者
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ASAI Takahiro
Wireless Laboratories, NTT DoCoMo, Inc.
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HIGUCHI Kenichi
Wireless Laboratories, NTT DoCoMo, Inc.
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SAWAHASHI Mamoru
Wireless Laboratories, NTT DoCoMo, Inc.
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Asai Takahiro
Wireless Laboratories Ntt Docomo Inc.
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Higuchi K
Ntt Docomo Inc. Yokosuka‐shi Jpn
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Sawahashi M
Ntt Docomo Inc. Yokosuka‐shi Jpn
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Sawahashi Mamoru
Wireless Laboratories Ntt Do Como Inc.
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Higuchi Kenichi
Wireless Laboratories Ntt Docomo Inc.
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Asai T
Research Laboratories Ntt Docomo Inc.
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