Subcarrier Deletion Method to Reduce Peak-to-Average Power Ratio for OFDM without Bandwidth Loss
Date Issued
2004
Date
2004
Author(s)
Shen, Chun-Ju
DOI
en-US
Abstract
A novel method, called Subcarrier-Deletion method, or generalized parallel combinatory-orthogonal frequency division multiplexing (GPC-OFDM) signaling, is proposed to reduce the peak-to-average power ratio (PAR) of OFDM signals. This method is based on expanding the M-PSK constellation with one extra zero point, and thus the number of available signals increases to (M+1)^N. From these signals we can choose M^N signals with PAR as small as possible for transmission. The Subcarrier-Deletion method is the first PAR reduction method that achieves a lot of distinctive marks, including zero redundancy, guaranteed worst PAR, and even constant-bounded PAR for large number of subcarriers. Also, the BER performance for OFDM systems using Subcarrier-Deletion method is considered. The BER performance of the proposed OFDM system is better than that of ordinary OFDM when the factors, such as the number of subcarriers and signal-to-noise ratio, are appropriately chosen. To further reduce the BER, we also incorporate the ideas of graph matching to construct the Graph Mapping algorithm. Finally, we derive a quite accurate formula of the bit error rate (BER) on an AWGN channel by novel concepts, which regard the chosen unstructured code as the subset of a complete structured code, and thus their position distributions in the structured code can be used to analyze the BER.
Subjects
正交分頻多工
峰均比
OFDM
PAR
Type
thesis
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