A Computational Complexity Reduction Scheme Using Walsh Hadamard Sequence in SLM Method
SLM (selective mapping) method is one of the efficient techniques to reduce PAPR (peak to average power ratio) in OFDM (orthogonal frequency division multiplexing) system. So, in many papers, it has been proposed. However, SLM method has a serious disadvantage. Because the SLM uses many copy branches and IFFT blocks, it requires much system complexity and computational burden. In this paper, we proposed a new SLM method which rotates the phase of input data after IFFT by using Walsh Hadamard code to solve this problem. Walsh Hadamard code can be generated by multiplying several cyclic sequences constituted by a certain short sub-sequence. By using the DFT characteristics of these cyclic sequences, we can rotate the phase of input data after IFFT and make many copy branches which have a small computational burden. From the simulation results, we can find that the proposed SLM method has 0.5 dB lower PAPR reduce effect than common SLM in same number of copy branch U. However, it can reduce a computational burden more than about 50％. In this paper, we consider about 1±phase rotation. If also is used for phase rotation with j ± 1 ±,our proposed method can reduce a computational burden more largely.
Sang-Woo Kim Jin-Kwan Kim Heung-Gyoon Ryu
Department of Electronic Engineering Chungbuk National University 12 Kaesin-dong, Cheongju, Chungbuk, 361-763, Republic of KOREA
国际会议
2006 International Conference on Communications,Circuits and Systems(第四届国际通信、电路与系统学术会议)
广西桂林
英文
762-766
2006-06-25（万方平台首次上网日期，不代表论文的发表时间）