Group Synchronization for Digital Transmission Systems

Sekimoto, Takashi; Kaneko, H.

doi:10.1109/tcom.1962.1088693

Cited by 9 publications

(1 citation statement)

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“…The basic theory of frame synchronization for a single-channel digital communication system was presented, and the design of frame markers was discussed [1]. In recent years, inserting special auxiliary bits is the key technique in most researches on frame synchronization [2]- [5]. However, the above addition of redundant bits will cause the The associate editor coordinating the review of this manuscript and approving it for publication was Derek Abbott .…”

Section: Introductionmentioning

confidence: 99%

A Spectrum Efficient Constellation to Simultaneously Transmit Information and Synchronization Sequence

Yao

Yuan

et al. 2020

IEEE Access

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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. INDEX TERMS Bit error rate (BER), Doppler shift, frame synchronization, quadrature phase shift keying (QPSK).

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Section: Introductionmentioning

confidence: 99%