Adaptive DS/CDMA Packet Radio Communications over Indoor Multipath Fading Channels(Wireless Communication Technologies)
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概要
- 論文の詳細を見る
In this paper, we propose an adaptive data transmission scheme for DS/CDMA packet radio communication systems in bandlimited indoor multipath fading channels. We first analyze the relationship between the code rate and the processing gain (defined as the number of chips per coded bit) in maximizing the normalized throughput in connection with the channel state of the indoor multipath fading channels. One observation made is that the maximum throughput with BPSK modulation is attained when the code rate is chosen as low as possible irrespective of the channel state, and the processing gain is increased (decreased) as the channel becomes worse (better). The other observation made is that when DPSK modulation is employed, there exists an optimal combination of the code rate and the processing gain in maximizing the normalized throughput for each channel state. Based on these observations, we propose to adapt the processing gain and/or code rate according to the fading conditions in order to maximize the normalized throughput. We analyze the performance of the proposed scheme and compare it with the non-adaptive data transmission scheme. Our results show that the adaptive transmission scheme yields a significant performance improvement over the nonadaptive scheme, and increasing the adaptation level is more effective as the channel gets worse, but the 3-state adaptation seems to be practically optimum.
- 社団法人電子情報通信学会の論文
- 2007-05-01
著者
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YOON Seokho
School of Information and Communication Engineering, Sungkyunkwan University
-
Kim Sun
Department Of Chemical Engineering Sogang University
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Yoon Seokho
Sungkyunkwan Univ. Suwon Kor
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Yoon Seokho
School Of Information And Communication Engineering Sungkyunkwan University
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Lee Ye
Department Of Electronic And Information Engineering Seoul National University Of Technology
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Kim Sun
Department Of Electronics Engineering Konkuk University
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Kim Sun
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Kim Sun
Department Of Animal Science And Technology Seoul National University
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