Performance Evaluation of Coherent High-Speed TD-OFCDM Broadband Packet Wireless Access in Forward Link Employing Multi-Level Modulation and Hybrid ARQ (Special Section on Multi-dimensional Mobile Information Networks)
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概要
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This paper evaluates high-speed broadband packet wireless access in the forward link using coherent Time Division-Orthogonal Frequency and Code Division Multiplexing (TD-OFCDM) by applying time-multiplexed pilot symbol assisted channel estimation and integrating efficient multi-level modulation, hybrid automatic repeat request(ARQ), and codemultiplexing over a 50-100 MHz bandwidth. Computer simulation results first clarify that the common time-multiplexed pilot symbols with the transmit power of 6 dB higher than that of data symbols should be placed at both the beginning and end of a packet, and that the optimum averaging interval of channel estimates in the frequency domain is different according to the delay spread of a channel. Based on these optimized parameters for packet transmission, we show that the orthogonality among the code-multiplexed channels is destroyed due to severe frequency selective (multipath) fading and the accumulation of spread signals using equal gain combining(EGC) in the frequency domain. This degrades the achievable throughput performance especially when employing multi-level modulation and a high coding rate. Consequently, coherent TD-OFCDM with 8PSK data modulation and the convolutional coding of rate R = 2/3 employing sixteen-code multiplexing (spreading factor(SF) is 16) achieves the highest throughput of approximately 105 Mbps at the average received E_b/N_0 (signal energy per bit-to-noise power spectrum density ratio) of approximately 24 dB in a 3-path Rayleigh fading channel (rms delay spread, σ = 0.1 μsec). Furthermore, in coherent TD-OFCDM with QPSK and R =4/5 or 8PSK and R = 1/2, throughput performance greater than 80 Mbps is achieved at the average received E_b/N_0 of approximately 20 dB even in a 24-path Rayleigh fading channel (σ = 0.2 μsec).
- 社団法人電子情報通信学会の論文
- 2001-07-01
著者
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SAWAHASHI Mamoru
Wireless Laboratories, NTT DoCoMo, Inc.
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Atarashi Hiroyuki
Wireless Laboratories, NTT DoCoMo, Inc.
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Sawahashi Mamoru
Department Of Electrical Engineering Tokyo University Of Science
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Sawahashi Mamoru
Wireless Laboratories Ntt Do Como Inc.
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ABETA Sadayuki
IP Radio Network Development Department, NTT DoCoMo, Inc.
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Abeta Sadayuki
Wireless Laboratories, NTT DoCoMo, Inc.
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Abeta S
Ip Radio Network Development Department Ntt Docomo Inc.
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Abeta Sadayuki
Wireless Laboratories Ntt Docomo Inc.
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Sawahashi M
Ip Radio Network Development Department Ntt Docomo Inc.
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Atarashi Hiroyuki
Radio Access Network Development Department Ntt Docomo Inc.
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Atarashi H
Faculty Of Science And Technology Keio University:(present Address) Ntt Mobile Communications Networ
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Atarashi Hiroyuki
Wireless Laboratories Ntt Docomo Inc.
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