Diversity Gain in Ultra Wideband Impulse Radio (UWB-IR)(Wireless Communication Technology)
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概要
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In this paper, we propose a Time Interleave (TI)-Ultra Wideband (UWB)-Impulse Radio (IR) system where Nf monocycle pulses per information symbol are transmitted not continuously but discontinuously through the time interleaver to get more time diversity. Moreover, we compare the diversity gains of the UWB-IR systems on block fading channels with the fading block size q: the UWB-IR system with a single transmit antenna, the Space Time (ST)-UWB-IR system with Nt transmit antennas, and the TI-UWB-IR system with a single transmit antenna. Simulation results show that when the fading block size q = 1, the diversity gains of all the systems are same. When q is larger than or equal to 2 (q ≥ 2) and when both the number of transmit antennas Nt of the ST-UWB-IR system and the time interleaver size NTI of the TI-UWB-IR system are larger than or equal to q (N_t, N_<TI> ≥ q), we show the following; both the ST-UWB-IR system and the TI-UWB-IR system achieve the same diversity gain that is constant regardless of Nt and NTI- On the other hand, when q ≥ 2 and when Nt and NTI < q, we show the following; when Nt = NTI, the ST-UWB-IR system and the TI-UWB-IR system get the same diversity gain; when N_t > N_<TI>, the diversity gain of the ST-UWB-IR system is larger than that of the TI-UWB-IR system; and vice when N_t > N_<TI>.
- 社団法人電子情報通信学会の論文
- 2004-08-01
著者
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Ohtsuki Tomoaki
Faculty Of Science And Technology Keio University
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Ezaki Takahiro
Graduate School Of Science And Technology Tokyo University Of Science
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