基于空时分组编码和天线选择的MB-OFDM超宽带系统

The MB-OFDM Ultra-wide band communication system based on space-time block code and antenna selection

超宽带(UWB)通信系统在未来的短距离高速通信中有很大的发展潜力,为了使系统达到更大的容量和更好的速率,一个可行的办法是采用可以带来空间和多径分集效果的多输入多输出(MIMO)技术和合适的信道编码技术。但在采用多个发送天线/接收天线的同时,所面临的主要问题是和单天线的射频链路相比系统增加了硬件的复杂度和所需的射频链路,增大了超宽带系统的硬件开销。一种有效的降低开销的技术是在发送或者接收端使用基于某些最优准则的选择算法来进行天线的选择。基于传统的MB-OFDM超宽带物理层结构,提出了使用空时分组编码和基于最小误比特率的天线选择算法来改善系统的性能。仿真结果表明,使用天线选择的空时编码超宽带通信系统能在较小开销的情况下,在修正的S-V信道中有效降低了系统的误比特率和提高了系统的传输速率。

The emerging ultra wideband （UWB） system offers a great potential for the design of high speed shortrange wireless communications, In order to satisfy the growing demand for higher data rates and high capacity, one possible solution is to exploit both spatial and multipath diversities via the use of multiple-input multiple-output （MI-MO） and proper coding techniques. The major problems of such systems are high cost and complexity due to more than one radio frequency （RF） chains at both end links. An effective technique to reduce this overhead is to allow the transmitter and/or the receiver to select an optimum antenna subset according to some optimization criterion. Based on traditional MB-OFDM ultra-wide band physics level structure, we propose an optimum selection criterion.to minimize the Bit Error Ratio （BER） and Space-Time Block Coding （STBC） to improve system performance. The simulation result indicated that, The STBC-UWB communications system with antenna Selection reduced the Bit Error Ratio （BER） and raised transmission rate in the revision S-V channel.