快衰落瑞利信道下分布式線性卷積空時(shí)碼的分集增益
doi: 10.11999/JEIT180343 cstr: 32379.14.JEIT180343
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西安電子科技大學(xué)綜合業(yè)務(wù)通訊網(wǎng)理論及關(guān)鍵技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室 ??西安 ??710071
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中國(guó)電子科技集團(tuán)公司數(shù)據(jù)鏈技術(shù)重點(diǎn)實(shí)驗(yàn)室 ??西安 ??710068
Diversity Gain of Distributed Linear Convolutive Space-time Code on Fast Fading Rayleigh Channels
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State Key Laboratory of Integrated Service Network, Xidian University, Xi’an 710071, China
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Key Laboratory of Data Link, China Electronics Technology Group Corporation, Xi’an 710068, China
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摘要:
在無(wú)線中繼網(wǎng)絡(luò)中,中繼節(jié)點(diǎn)間的隨機(jī)傳輸延遲將導(dǎo)致顯著的性能下降。因此,針對(duì)慢衰落瑞利信道提出可容忍隨機(jī)時(shí)延的分布式線性卷積空時(shí)碼(DLC-STC),但該類空時(shí)碼在快衰落信道下的分集性能尚未明確。該文從理論上證明了DLC-STC在快衰落瑞利信道下的分集增益。分析表明,DLC-STC雖然最初是在慢衰落信道下被提出的,但它在快衰落瑞利信道下通過(guò)利用最大似然(ML)接收機(jī),仍可獲得滿異步協(xié)作分集增益,仿真結(jié)果驗(yàn)證了該理論分析,仿真結(jié)果同時(shí)表明:在快衰落瑞利信道下,DLC-STC采用MMSE-DFE接收機(jī)能夠獲得與ML接收機(jī)相同的分集增益。
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關(guān)鍵詞:
- 快衰落瑞利信道 /
- 分布式線性卷積空時(shí)碼 /
- 分集增益
Abstract:In wireless relay networks, random transmission delays among relay nodes will lead to substantial performance degradation, for which delay-tolerant Distributed Linear Convolutive Space-Time Code (DLC-STC) is proposed. However, its diversity gain on fast fading Rayleigh channels is not clear. This paper analyzes the diversity gain of the DLC-STC on fast fading Rayleigh channels. It is shown that the DLC-STC can achieve full asynchronous cooperative diversity order with Maximum Likelihood (ML) receivers on fast fading Rayleigh channels, although it is originally proposed for slow fading channels. The numerical results verify the theoretical analysis and show that MMSE-DFE receivers, can collect the same diversity order as ML receivers on fast fading Rayleigh channels.
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