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介绍了一种有效的信道编码方案-空时码,它不用增加传输带宽就能大幅度提高信道的吞吐量。还对空时码不同分类间的优缺点作了比较,并提出了下一步研究的方向。由于空时码具有很高的频谱利用率,所以最近有一种叫空时扩频(space-timespreading)已经作为cdma2000(3GPP2)的一种候选传输方案,还有另一种空时发射分集(STTD)也被引入到UMTSW-CDMA标准(3GPP1)中,而且它还有可能在4G中和未来无线局域网中得到广泛的应用。
An effective channel coding scheme, called space-time code, is introduced, which can greatly improve the channel throughput without increasing the transmission bandwidth. The advantages and disadvantages of different categories of space-time codes are also compared and the direction of further research is proposed. Since space-time codes have high spectrum efficiency, a space-time spreading has recently been proposed as a candidate transmission scheme for cdma2000 (3GPP2), and another space-time transmit diversity (STTD ) Has also been introduced into the UMTSW-CDMA standard (3GPP1), and it is also likely to find wide application in 4G and future wireless LANs.