基于Schmidt正交化的多天線選擇復(fù)用

周華; 馬敏; 楊大成

基于Schmidt正交化的多天線選擇復(fù)用

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出版歷程
- 收稿日期: 2003-06-15
- 修回日期: 2003-12-19
- 刊出日期: 2004-12-19

Selected Transmission of Multiple Antennas Based on Schmidt Orthogonalization

摘要

摘要: 該文從提高信道傳輸有效性的角度，提出了一種新的多天線選擇發(fā)送策略--貪婪搜索(GS)法，使用這種方法挑選出使容量最大化的發(fā)送天線組合作為傳輸信號的天線。此法在結(jié)合注水(waterfilling)法進行天線功率分配的情況下，與理想的全天線注水法相比，可以減小發(fā)射機的復(fù)雜度，在獨立信道下傳輸容量略有損失，在相關(guān)信道下可以提高傳輸容量，并且所付出的代價是僅需要對信道矩陣進行Schmidt正交化變換。這種方法一般用于信道矩陣列不滿秩，即發(fā)送端天線數(shù)大于接收端天線數(shù)，發(fā)送端已知信道矩陣的情況(與注水法結(jié)合)或者接收端已知信道矩陣的情況(等功率分配)。
- MIMO; 信道容量; Schmidt正交化; 奇異值分解
Abstract: A new selected transmission scheme of multiple antennas is proposed, named Greedy Search (GS) method. The transmit antennas selected from all antennas can be used as the active transmit antennas. When, used with waterfilling power allocation, GS method can decrease the complexity of signal design on antennas, compared with Waterfilling power allocation on all Antennas (WA). The capacity loss over WA in independent fading channels is rather small, moreover, this method can get capacity gain over WA in spatial dependent fading channels. The cost of capacity gain of GS is the necessity of Schmidt orthogonalization on the channel matrix. GS can be used when the channel matrix is not column-full-rank, i.e., the number of transmit antennas is greater than that of receive antennas, and the transmitter can get the full channel matrix information (used with waterfilling power allocation); or; the receiver can get the full channel matrix information (used with equal power allocation).

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參考文獻(1)

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