MC-CDMA系統(tǒng)中自適應調(diào)制算法的性能分析
Performance Analysis of Adaptive Modulation in MC-CDMA Systems
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摘要: 自適應調(diào)制能提高系統(tǒng)的頻譜利用率和改善系統(tǒng)的誤碼率性能。該文提出了一種將自適應調(diào)制算法與MC-CDMA技術相結(jié)合的方案。采用這種方案的自適應MC-CDMA系統(tǒng)在獲得頻率分集增益和有效頻譜利用率的同時，還能獲得很好的誤碼率性能。文章分析了提出的自適應MC-CDMA系統(tǒng)的性能，并通過仿真結(jié)果說明了合并方式和信道環(huán)境都將影響自適應調(diào)制算法在MC-CDMA中應用的有效性。Abstract: Adaptive modulation can improve the system performance with high spectral efficiency. In this paper, a combining scheme of MC-CDMA and adaptive modulation is proposed in order to achieve the frequency diversity and the spectral efficiency without loss of much BER performance. The performance of the MC-CDMA system with adaptive modulation is analyzed. Simulation results also indicate the combining schemes and the channel environment will affect the efficiency of adaptive modulation algorithm in MC-CDMA systems.
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Ramjee Parasad, Shinsuke Hara. An overview of multicarrier CDMA[J].IEEE ISSSTA96, Germany, Sept.1996, Vol. 1:107-[2]Shinsuke Hara, Ramjee Parasad. Design and performance of multicarrier CDMA system in frequency selective Rayleigh fading channels[J].IEEE Trans. on Vehicular Technology.1999,48(9):1584-[3]Rainer Grunheid, Edgar Bolinth, Hermann Rohling, Kurt Aretz.Adaptive modulation for the HIPERLAN2 air interface. 5th Internaltional OFDM-Workshop, Hamburg, 2000.[4]Atarashi Hiroyuki, Abeta Sadayuki, Sawahashi Mamoru. Pilot channel assisted MMSE combining in forward link for broadband OFCDM packet wireless access. IEICE Trans. on Fundamentals of Electronics, Communications and Computer Sciences, 2002,(7): 1635 - 1647. -
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