Subband Based Adaptive Bit and Power Allocation for OFDM Systems

摘要：

In this paper, by contrast with “subcarrier-tosubcarrier allocation method, subband based bit and power allocation methods are discussed to decrease the computational complexity for OFDM systems. Hughes Hartogs algorithm (HHA) is modified for subband based allocation. Bit and power is adaptively allocated into subbands by two means: constant bit rate (CBR) adaptation and variable bit rate (VBR) adaptation. The simulations are carried out on a 1024-subcarrier OFDM platform and the results show that in the range of low average bit SNR(under 15dB) over vehicular A channel the computational complexity overhead can be reduced by 80％ or 90％ at the cost of performance loss less than 1 dB or 3dB respectively.

关键词： adaptive modulation constant bit rate (CBR) OFDM subband variable bit rate (VBR)

作者: Xi Cao Guangxi Zhu Xuejun Liang Li Tan

作者单位: Department of Electronics & Information Engineering Huazhong University of Science & Technology Wuhan,P.R.China

会议类型: 国际会议

会议名称: 第二届IEEE无线通讯、网络技术暨移动计算国际会议

会议地点: 武汉

会议语种:英文

在线出版日期: 2006-09-01（万方平台首次上网日期，不代表论文的发表时间）