Subband based adaptive bit and power allocation for OFDM systems

被引：0
|
作者：
Cao, Xi [1 ]
Zhu, Guangxi [1 ]
Liang, Xuejun [1 ]
Tan, Li [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Elect & Informat Engn Dept, Wuhan 430074, Peoples R China
来源：
2006 IEEE INTERNATIONAL CONFERENCE ON WIRELESS COMMUNICATIONS, NETWORKING AND MOBILE COMPUTING, VOLS 1-4 | 2006年
关键词：
adaptive modulation; constant bit rate (CBR); OFDM; subband; variable bit rate (VBR);
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this paper, by contrast with "subcarrier-to-subcarrier" 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.
引用
收藏
页码：203 / 206
页数：4
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