一種適合OFDM系統(tǒng)的發(fā)射分集技術(shù)
A Transmit Diversity Technique for OFDM
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摘要: 該文詳細(xì)分析了OFDM系統(tǒng)的發(fā)射分集技術(shù)，當(dāng)信道特性在兩個(gè)符號(hào)期間不發(fā)生變化時(shí)，發(fā)射分集技術(shù)能有效地提高OFDM系統(tǒng)的性能。然而在無(wú)線移動(dòng)環(huán)境下，信道特性是時(shí)變的，它將嚴(yán)重影響發(fā)射分集的性能。為了降低時(shí)變信道的影響，該文運(yùn)用判決反饋技術(shù)對(duì)分集技術(shù)中的判決方法作了改進(jìn)，并在室外環(huán)境下進(jìn)行了仿真分析。仿真結(jié)果農(nóng)明改進(jìn)后的發(fā)射分集技術(shù)在無(wú)線移動(dòng)環(huán)境下能有效地提高系統(tǒng)性能。
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關(guān)鍵詞:
- OFDM; MIM0; 空時(shí)碼; 發(fā)射分集
Abstract: A simple transmit diversity technique assumes that channel does not change over two symbol period of time. Therefore, this technique is not suitable for time varying channels. This paper modifies the transmit diversity technique to accommodate time varying channel (mobile multipath channel). Simulation results show that the proposed modification works well in fast varying channel. -
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