使用錯誤更正碼以降低OFDM的峰均值功率比及錯誤率之研究(1/3)
Date Issued
2004-10-31
Date
2004-10-31
Author(s)
DOI
922213E002075
Abstract
OFDM system has been popularly applied to the
many communication systems. Its major
disadvantage is the high probability of large
peak-to-average power ratio. We propose a turbo
coded OFDM system with PAPR reduction by using
selective mapping based method. For the first design
we apply several maximum length sequences to the
message bits to increase the PAPR reduction
capability. We then have several OFDM symbols
with the same information and different PAPR values.
Then, we choose the one with the smallest PAPR for
transmission. The side information is attached at the
back of data frame and protected by the turbo coding.
There is no need of extra protection to the side
information. We can get the satisfactory bit error rate
performance at high SNR. For the second design, we
use several distinct interleavers in the turbo encoder.
In this way, the necessity of side information is
eliminated. For both the first and the second designs
we consider the effect of arranging the parity bits of
turbo codewords.
Subjects
OFDM
turbo code
peak-to-average
power ratio
power ratio
maximum length sequence
Publisher
臺北市：國立臺灣大學電信工程學研究所
Type
report
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