一種空時(shí)分組碼在頻率選擇性信道下的半盲遞推解碼
Recursive Semi-blind Decoding of a Space-Time Block Code in Frequency-Selective Channel
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摘要: 該文針對(duì)頻率選擇性信道下的Alamouti空時(shí)分組碼，提出了一種在接收端未知信道信息的情況下的半盲的遞推解碼方法。該方法基于子空間方法，利用少量的導(dǎo)頻符號(hào)和空時(shí)分組碼的結(jié)構(gòu)，遞推地同時(shí)完成信道均衡和解碼，直接解得信息符號(hào)。與已有的按塊批處理的盲解碼方法相比，遞推方法因?yàn)樵谶f推過(guò)程中利用已經(jīng)判得的過(guò)去的信息符號(hào)，能夠方便地進(jìn)行性能與運(yùn)算量的折衷。仿真結(jié)果驗(yàn)證了方法的有效性。
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關(guān)鍵詞:
- 遞推解碼;空時(shí)分組碼;頻率選擇性;盲均衡;聯(lián)合均衡解碼
Abstract: In the paper, assuming frequency-selective channel, a recursive semi-blind joint equalization and decoding method for Alamouti space-time block code is proposed. Based on subspace-based blind equalization method, the proposed method sequentially decodes Alamouti space-time block code without channel state information by exploiting the structure of the space-time block code and a few pilot symbols. In contrast with previous block-based blind decoding methods, the proposed method is more amicable to allowing tradeoff between performance and complexity. Simulation results demonstrate the effectiveness and flexibility of the proposed method. -
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