Adaptive Subcarrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Downlink OFDM Using Uplink Delay Spread
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概要
- 論文の詳細を見る
In AMS/OFDM systems, base station is in control of the modulation level of each subcarrier, and then, adaptive modulated packet is transmitted from the base station to the mobile station. In this case, the mobile station is required the modulation level information (MLI) to demodulate the received packet. The MLI is generally transmitted as a data symbol, therefore, the throughput is degraded. In an OFDM, the channel response at a particular subcarrier frequency is not supposed to be totally different from its neighboring frequencies, and hence, they must have correlation which depends on the coherence bandwidth of the channel Bc. If we could assign the same modulation level for coherently faded subcarrier block, MLI is required only one time for each subcarrier block. Moreover, we can assign the data on the empty space of pilot signals for increasing the total transmission. In this paper, we propose an adaptive subcarrier block modulation with differentially modulated pilot symbol assistance for downlink OFDM using uplink delay spread.
- 社団法人電子情報通信学会の論文
- 2005-07-01
著者
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HARADA Hiroshi
the National Institute of Information and Communications Technology (NICT)
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KAMIO Yukiyoshi
the National Institute of Information and Communications Technology (NICT)
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Sasase Iwao
Keio Univ. Yokohama‐shi Jpn
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Sasase Iwao
Department Of Information And Computer Science Keio University
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Harada H
National Inst. Of Information And Communications Technol. (nict) Kanagawa Jpn
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Sasase Iwao
Keio Univ. Yokohama Jpn
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Ahn C‐j
National Institute Of Information And Communications Technology
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AHN Chang
The National Institute of Information and Communication Technology (NICT), Incorporated Administrati
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TAKAHASHI Satoshi
The National Institute of Information and Communication Technology (NICT), Incorporated Administrati
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AHN Chang-Jun
the National Institute of Information and Communications Technology
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Ahn Chang-jun
Atr Wave Engineering Laboratories
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Changjun An
Graduate School Of Engineering Chiba University
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Kamio Yukiyoshi
National Institute Of Information And Communication Technology (nict) Incorporated Administrative Ag
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Takahashi Satoshi
National Institute Of Information And Communications Technology:(present Address)faculty Of Informat
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Harada Hiroshi
New Generation Wireless Communications Research Center National Institute Of Information And Communi
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Ahn C‐j
National Institute Of Information And Communication Technology (nict) Incorporated Administrative Ag
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