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Construction of 16QAM and 64QAM OFDM Codes with Low PAPR and Large Euclidean Distance
Houshou CHEN Hsinying LIANG
Publication
IEICE TRANSACTIONS on Communications
Vol.E90B
No.8
pp.19881996 Publication Date: 2007/08/01
Online ISSN: 17451345
DOI: 10.1093/ietcom/e90b.8.1988
Print ISSN: 09168516 Type of Manuscript: PAPER Category: Fundamental Theories for Communications Keyword: OFDM, PAPR, BCM, Golay complementary sequences, ReedMuller codes, squared Euclidean distance,
Full Text: PDF(285.3KB)>>
Summary:
This paper considers reduction of the peaktoaverage power ratio (PAPR) of Mquadrature amplitude modulation (QAM) signals in orthogonal frequency division multiplexing (OFDM) systems. It is known that a 16QAM or 64QAM constellation can be written as the vector sum of two or three QPSK constellations respectively. We can then use the Golay complementary sequences over Z_{4} to construct 16QAM or 64QAM OFDM sequences with low PAPR. In this paper, we further examine the squared Euclidean distance of these MQAM sequences and their variations. Our goal here is to combine the block coded modulation (BCM) and Golay complementary sequences to trade off the PAPR, the code rate, and the squared Euclidean distance of MQAM OFDM signals. In particular, some 16QAM and 64QAM OFDM sequences with low PAPR and large squared Euclidean distance are presented.

