新的時變信道下空時分組編碼多用戶系統(tǒng)解碼器設(shè)計
Design of New Decoder for Space-Time Block Coded Multiuser System over Time-Selective Fading Channels
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摘要: 該文提出了兩種新的適用于時變信道下空時分組編碼多用戶系統(tǒng)的解碼器設(shè)計方案。空時分組編碼多用戶系統(tǒng)下，傳統(tǒng)的迫零(Zero Forcing, ZF)和最小均方誤差(Minimum Mean Squared Error, MMSE)解碼器設(shè)計均假定信道準(zhǔn)靜態(tài)衰落。信道時變時，這些傳統(tǒng)解碼器在解碼某用戶信號時引入符號間干擾(Inter-Symbol Interference, ISI)，且這種干擾隨信道時變增大而增加?；诖?，該文設(shè)計了兩種新的解碼器，該解碼器可顯著降低信道時變的影響。仿真結(jié)果表明，隨信噪比(Signal-to-Noise Ratio, SNR)增加，兩種傳統(tǒng)解碼器均出現(xiàn)誤碼率性能平層，而新解碼器獲得了顯著的性能改善。
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關(guān)鍵詞:
- 空時分組編碼;多用戶;時變信道;解碼器
Abstract: This paper proposed two new decoders for space-time block coded multiuser system over time-selective fading channels. For space-time block coded multiuser system, the design of conventional Zero Forcing (ZF) and Minimum Mean Squared Error (MMSE) decoder is based on the assuming that channels are quasi-static. When the channels are time-selective fading, these conventional decoders induce the Inter-Symbol Interference (ISI), in order to obtain one users signals, furthermore, the ISI becomes larger resulted from the increase of the channels time variations. So, this paper designed two new decoders and these decoders reduced greatly the influence of the channels time variations. Simulation results show that the both conventional decoders exhibit error floors, whereas the new decoders obtain more notable performance gains as the increase of Signal-to-Noise Ratio (SNR) values. -
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