A New Very High-Rate Wireless LAN System Employing OFDM and MC/CDMA Signals(Wireless LAN)(<Special Section>Mobile Multimedia Communications)
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概要
- 論文の詳細を見る
This paper considers a wireless LAN system operated in a multiple-cell environment with universal frequency reuse. A key technical goal is to increase cell-capacity within a cell. A very high-rate wireless LAN system, maximum data rates of over 100Mbit/s, is proposed that offers an expanded signal-bandwidth compared to that specified in IEEE802.11a. The system employs OFDM and MC/CDMA signals in packet mode. It falls back from OFDM signals with low subcarrier modulation orders to MC/CDMA signals. A link level performance comparison shows that OFDM has superior performance to MC/CDMA at over 32 Mbit/s. Under 16 Mbit/s, however, MC/CDMA can establish wireless link connections unlike OFDM. Thus the fallback technique, which is triggered by the CIR environment, should select OFDM if the data rate exceeds 32 Mbit/s. It should fallback to MC/CDMA if the rate is less than 16 Mbit/s. We also evaluate the proposed scheme in a multiple-cell environment with universal frequency reuse, where the severe co-channel (other-cell) interference is present. We derive a cell capacity criterion for wireless LAN systems, and show that the proposed scheme offers a 2.2 times larger available transmission distance than the OFDM-only scheme. In addition, it is found that the proposed scheme offers a 1.3 times improvement in cell capacity compared to the MC/CDMA-only scheme, even if all other-cell interference is considered.
- 社団法人電子情報通信学会の論文
- 2004-05-01
著者
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ONIZAWA Takeshi
NTT Access Network Service Systems Laboratories, NTT Corporation
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SAKATA Tetsu
NTT Access Network Service Systems Laboratories, NTT Corporation
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Morikura Masahiro
Ntt Information Sharing Laboratory Group Ntt Corporation
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Morikura M
Ntt Access Network Serv. Systems Lab. Yokosuka‐shi Jpn
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Morikura Masahiro
Ntt Wireless Systems Laboratories
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AIKAWA Satoru
NTT Access Network Service Systems Laboratories, NTT Corporation
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Sakata T
Ntt Corp. Yokosuka-shi Jpn
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Sakata Tetsu
Ntt Advanced Technology Co.
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Sakata Tetsu
Ntt Access Network Service Systems Laboratories
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Morikura Masahiro
NTT Research and Development Headquarters
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Onizawa Takeshi
Ntt Access Network Service Systems Laboratories Ntt Corporation
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FUJITA Takafumi
NTT Access Network Service Systems Laboratories, NTT Corporation
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Morikura Masahiro
Ntt Access Network Service Systems Laboratories
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Morikura M
Ntt Information Sharing Laboratory Group Ntt Corporation
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Fujita T
Ntt Network Innovation Laboratories Ntt Corporation
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Onizawa T
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Onizawa Takeshi
Ntt Corp. Yokosuka‐shi Jpn
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Aikawa S
Ntt Access Network Service Systems Laboratories Ntt Corporation
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Aikawa Satoru
Ntt Access Network Service Systems Laboratories Ntt Corporation
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ONIZAWA Takeshi
NTT Access Network Service Systems Laboratories
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