一種新的多天線系統(tǒng)中的快速廣義球形解碼算法
A New Fast Generalized Sphere Decoding Algorithm in MIMO Systems
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摘要: 該文提出了一種新的廣義球形解碼算法.與常規(guī)球形解碼算法相比,它能夠處理多輸入多輸出系統(tǒng)(MIMO)中發(fā)送天線M多于接收天線N的情形,并且其解碼速度遠大于已有的廣義球形解碼算法.其基本思想是將M維的傳輸信號矢量分成N-1和M-N+1維的子矢量xa和xb,通過一些簡單地變換,就可以使用一個常規(guī)球形解碼器來選取合適的xb,然后再利用另一個常規(guī)球形解碼器來獲得xa,從而得到整個傳輸信號矢量.仿真結(jié)果表明,這種新的快速廣義球形解碼算法(命名為雙層球形解碼算法)比現(xiàn)有的廣義球形解碼算法具有更低的復(fù)雜度.
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關(guān)鍵詞:
- 無線通信;廣義球形解碼算法;雙層球形解碼算法;多輸入多輸出系統(tǒng)
Abstract: A new generalized sphere decoding algorithm is proposed for under-determined MIMO systems with fewer receive antennas TV than transmit antennas M. The proposed algorithm is significantly faster than the existing generalized sphere decoding algorithms. The basic idea is to partition the transmitted signal vector into two subvectors xa and xb with N-1 and M- N+l elements respectively. After some simple transformations, an outer layer Sphere Decoder (SD) can be used to choose proper xb and then use an inner layer SD to decide xa thus the whole transmitted signal vector is obtained. Simulation results show that Double Layer Sphere Decoding (DLSD) has far less complexity than the existing Generalized Sphere Decoding (GSDs). -
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