TY - JOUR
T1 - A Spectrum Efficient Constellation to Simultaneously Transmit Information and Synchronization Sequence
AU - Yao, Rugui
AU - Zhang, Yuan
AU - Wu, Qihong
AU - Tsiftsis, Theodoros A.
AU - Qi, Nan
AU - Zuo, Xiaoya
AU - Guo, Shuxia
N1 - Publisher Copyright:
© 2013 IEEE.
PY - 2020
Y1 - 2020
N2 - In this paper, a new type of quadrature phase shift keying (QPSK) modulation, named as special QPSK (SQPSK), is proposed and optimized. For SQPSK, the quadrant of the symbol is determined by the bits in information sequence according to QPSK constellation, while the offset relative to the original QPSK constellation is controlled by the bits in synchronization sequence. Under this scheme, the simultaneous transmission of information and synchronization sequences is implemented to improve spectrum efficiency with low computational complexity. In order to achieve the best balance beteween the bit error rate (BER) and the synchronization performance, we optimize the parameter design. Furthermore, a joint synchronization scheme is proposed for frame synchronization, frequency offset estimation, and frequency offset compensation to solve the performance loss caused by Doppler frequency shift in practical applications. Then based on the characteristics of the constellation map, a dynamic threshold demodulation scheme which further improves the BER performance is discussed. Finally, some simulation results are given to show that the SQPSK not only has both good error performance and acquisition performance, but also improves the spectrum utilization of channel resource significantly.
AB - In this paper, a new type of quadrature phase shift keying (QPSK) modulation, named as special QPSK (SQPSK), is proposed and optimized. For SQPSK, the quadrant of the symbol is determined by the bits in information sequence according to QPSK constellation, while the offset relative to the original QPSK constellation is controlled by the bits in synchronization sequence. Under this scheme, the simultaneous transmission of information and synchronization sequences is implemented to improve spectrum efficiency with low computational complexity. In order to achieve the best balance beteween the bit error rate (BER) and the synchronization performance, we optimize the parameter design. Furthermore, a joint synchronization scheme is proposed for frame synchronization, frequency offset estimation, and frequency offset compensation to solve the performance loss caused by Doppler frequency shift in practical applications. Then based on the characteristics of the constellation map, a dynamic threshold demodulation scheme which further improves the BER performance is discussed. Finally, some simulation results are given to show that the SQPSK not only has both good error performance and acquisition performance, but also improves the spectrum utilization of channel resource significantly.
KW - Bit error rate (BER)
KW - Doppler shift
KW - Frame synchronization
KW - Quadrature phase shift keying (QPSK)
UR - http://www.scopus.com/inward/record.url?scp=85086228481&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2020.2995759
DO - 10.1109/ACCESS.2020.2995759
M3 - 文章
AN - SCOPUS:85086228481
SN - 2169-3536
VL - 8
SP - 95442
EP - 95456
JO - IEEE Access
JF - IEEE Access
M1 - 9096299
ER -