【作者】 苏敏； 覃团发； 刘运毅；

【Author】 SU Min, QIN Tuan-fa, LIU Yun-yi (College of Computer and Electronic Information, Guangxi University, Nanning Guangxi 530004, China)

【机构】 广西大学计算机与电子信息学院；

【摘要】 OFDM(正交频分复用)技术是宽带无线系统中高速率数据传输的基本技术之一。OFDM自适应比特和功率分配技术可以使具有不同信道条件的子载波装载不同的比特数和使用不同的传输功率,从而优化整个系统的性能。文章论述了OFDM自适应比特和功率分配技术的理论基础和分配准则,介绍了几种典型的自适应分配算法,并且进一步研究了几种改进的次优自适应分配算法,这些算法的复杂度较上述的算法大为下降,而性能则与典型算法相近,最后对OFDM自适应技术的研究方向进行了展望。更多还原

【Abstract】 OFDM(Orthogonal Frequency Division Multiplexing) is a promising technology for high data rate transmission in wide band wireless systems. OFDM adaptive bit and power allocation technology can allocate bits and power for subchannels according to the instantaneous channel characteristics, so that the performance of the system is optimized. This paper discusses the principle and rule of OFDM adaptive bit and power allocation technology. Several typical adaptive algorithms as well as several improved hypo-optimized adaptive algorithms are researched. The improved algorithms have much lower complexity while the performance is closed to the typical algorithms. Finally, the research direction of OFDM adaptive technology is forecasted.更多还原