多徑多用戶環(huán)境下超寬帶脈沖無線通信系統(tǒng)性能
Performance of ultra-wideband impulse radio wireless communication system in multipath and multiuser environments
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摘要: 超寬帶脈沖無線電是正在發(fā)展中的新型高速無線接入技術(shù)。該文首先分析了超寬帶發(fā)射信號實現(xiàn)多址通信的原理。為了研究在多徑環(huán)境下的系統(tǒng)性能，引入了確定型兩徑和統(tǒng)計型S-V兩種典型室內(nèi)信道模型。通過仿真試驗得到在此信道條件下系統(tǒng)的誤比特率。結(jié)果表明，在多徑多用戶環(huán)境下，符號間干擾和多址干擾使系統(tǒng)性能下降；當(dāng)接入用戶數(shù)達到一定值后，多址干擾成為降低系統(tǒng)性能的主要因素，采用接收天線分集能提高系統(tǒng)性能。
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關(guān)鍵詞:
- 超寬帶; 多徑信道; 分集; 多址干擾; 符號間干擾
Abstract: Ultra-wideband impulse radio is a developing high speed wireless access technology. In this paper, the principle of ultra-wideband multiaccess communication is analyzed with the transmitting signal. In order to study the system performance in mulitpath channels, the deterministic two-path model and the statistical S-V model are employed for evaluating the bit error rates of the system by simulation. The results indicate that the intersymbol interference and multiple access interference are the main factors that degrade the system performance, which, on the other hand, may be improved by antenna diversity. -
J.D. Taylor, Introduction to Ultra-Wideband Radar System, Florida: CRC Press, Inc., 1995,Chapter 1.[2]R.A. Scholtz, Multiple access with time-hopping impulse modulation, In Proc. of MILCOM93,Montreal, Oct. 1993, 447-450.[3]K. Siwiak, Radiowave Propagation and Antennas for Personal Communication, Boston, MA,Artech House, 1995.[4]A.A.M.Saleh, R. A. Valenzuela, A statistical model for indoor multipath propagation, IEEE JSAC, 1987, 5(2), 133-137.[5]Moe Z. Win, R. A. Scholtz, Impulse Radio:How it works, IEEE Communications Letters, 1998,2(1), 36-38.[6]Moe Z. Win, R. A. Scholtz, On the energy capture of ultrawide bandwidth signals in dense multipath environments, IEEE Communications Letters, 1998, 2(9), 245-247.[7]R. Jean-Marc Cramer, Moe Z. Win, R. A. Scholtz, Impulse radio multipath characteristics and diversity reception, IEEE ICC, Atlanta, Georgia, 1998, 1650-1654.PERFORMANCE OF ULTRA-WIDEBAND IMPULSE RADIO. -
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