超寬帶通信中模擬空時碼的一種子空間檢測方法
A Subspace Detection Method of Space-Time Block Codes for Ultra-wideband Communications
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摘要: 該文針對應(yīng)用于超寬帶(UWB)通信中的模擬空時碼, 提出了一種基于子空間的盲檢測方法。在接收端不需要估計信道，利用信號子空間和噪聲子空間正交的性質(zhì)，建立了一個二次型，最小化該二次型就可得到發(fā)送信號的估計。平坦衰落信道環(huán)境中的仿真表明，子空間方法能夠?qū)崿F(xiàn)和相關(guān)接收相同的分集增益；當(dāng)多個連續(xù)的空時碼聯(lián)合解碼時，其性能優(yōu)于現(xiàn)有的非相關(guān)解碼方法。
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關(guān)鍵詞:
- 空時編碼;多輸入多輸出;子空間方法;超寬帶通信
Abstract: In this paper, a subspace-based detection method is proposed for analog space-time codes wedded with ultra-wideband (UWB) transmissions. Without estimating the channels at the receiver, the proposed algorithm yields the estimation of transmitted symbols by minimizing some quadratic form built on the orthogonality between signal and noise subspaces. Simulations in flat-faded application scenarios show that, the subspace method can achieve the same diversity order with the coherent reception, and outperforms the noncoherent decoder in existence with multiple successive space-time codes being decoded jointly. -
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