摘要
对应用于OFDM系统下行链路的几种多址方式,TDMA、FDMA和CDMA进行了比较分析。研究表明,在系统用户数和速率相同时,采用CDMA多址方式的OFDM系统误比特率性能优于TDMA和FDMA。在时分双功(TDD)方式下,发射机已知信道增益时,最优子载波分配的FDMAOFDM系统性能优于其他多址技术。
The performance comparison of several multi access OFDM schemes was studied, including time division, frequency division, and code division. The study shows that code division is an effective technique in frequency selective channel. In addition, frequency division with optimal sub-carrier allocation is shown to outperform other multi access techniques when the transmitter has knowledge of the channel state information.
出处
《真空电子技术》
2004年第6期26-28,共3页
Vacuum Electronics
