摘要
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。
We consider an efficient channel cod ing scheme:space -time coding.It can improve the throughput of channel greatly,whereas it doesn' t need increase the bandwidth.We com pare the differ-ent scheme of space -time coding,and we point out the research topic in the future.For its high spectral efficiency a scheme for the CDMA downlink called Space -Time Spreading wa s introduced as an optional transmission mode in the cdma -2000(3GPP2)standard recently.Another scheme c alled Space -Time Transmit Diversity(STTD)was introduced to W-CDMA(3GPP1).It will be applied to 4G and high data rate wireless LAN in the future.
出处
《通信技术》
2002年第8X期3-5,共3页
Communications Technology
关键词
空时码
发射分集
多天线系统
高速无线通信系统
space -time code
transmit diversit y
multi -antennas system
high data rate wireless communication system
