A novel wireless communication device and its synchronization scheme

Lee, E.K.B.; Powell, C.C.; Kwon, Hyuck M.

doi:10.1109/glocom.1995.502011

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…This number is related to the total phase rotation angle over one symbol duration, and is used to estimate a transmitted data symbol by the symbol decision device. Symbol synchronization is assumed to be perfect [7].…”

Section: B Zifzcdmentioning

confidence: 99%

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Decision feedback postprocessor for zero-crossing digital FM demodulator

Lee

Hou²,

Kwon

1999

IEEE Trans. Veh. Technol.

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A baseband digital narrow-band FM receiver, called zero-intermediate frequency zero-crossing demodulator (ZIFZCD), has been recently developed. This demodulator may offer low complexity and simple implementation. However, the bit error rate (BER) performance of the ZIFZCD is inferior to that of the limiter-discriminator-integrate-and-dump (LDI) demodulator. In this paper, a simple decision feedback postprocessor (DFP) is proposed to improve the performance of the ZIFZCD. Analysis and simulation BER results of the ZIFZCD with the DFP are presented for minimum-shift keying (MSK) and Gaussian MSK (GMSK) signals under additive white Gaussian noise (AWGN) and mobile fading environments.

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Section: B Zifzcdmentioning

confidence: 99%

“…where and is given in (7). The BER of the ZIFZCD with the DFP with no click can be computed by using (9)-(13).…”

Section: Ber Analysis Of Zifzcd With Dfpmentioning

confidence: 99%

Decision feedback postprocessor for zero-crossing digital FM demodulator

Lee

Hou²,

Kwon

1999

IEEE Trans. Veh. Technol.

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“…Nevertheless, a decent digital filter design may require a complex structure and become very hardware intensive when compared to the demodulator itself. Lee et al proposed an alternative synchronization scheme for the ZIFZCD[44]. Under the condition ofFigure 5.14, a positive to negative transition is most likely occurred between t 4 and t 5 .…”

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confidence: 99%

A direct-conversion CMOS radio receiver for high speed paging

Chen¹

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As the radio paging system is upgraded from POCSAG to the high speed FLEX or ERMES protocol, both the modulation level and the baud rate are increased. What is unchanged is the available bandwidth. Consequently, the modulation index is decreased and additional difficulties are imposed on the design of a direct-conversion receiver. The main problems are (1) there are no mature demodulation techniques available for zero-IF M-ary FSK signals, and (2) the signal contains strong DC/low-frequency energy and hence DC offset cancellation is no longer an easy task. In this dissertation, a direct-conversion receiver is designed for high speed 4FSK radio paging applications. Various design considerations are discussed and analyzed. A zero-crossing based counting/comparing scheme is chosen for the demodulation. The BER is improved by a novel zero-crossing interpolation technique. Following official specifications on radio paging receivers, a high level simulation is carried out to verify the demodulator performance and derive circuit requirements. The self-mixing-related time-varying offset is suppressed by the harmonic mixer to the noise level. A differential peak alignment method is developed to cancel the mismatch-induced static offset. A frame-by-frame scheme is also proposed for further offset reduction. A prototype receiver is fabricated in a 0.35 micron CMOS process, with all major building blocks included. The front-end consists of a differential LNA and a quadrature harmonic mixer. In the base-band, an AGC circuit provides over 30 dB gain tuning range. The channel selection is done by a 5th order gyrator filter. The demodulator is formed by a 1-level zerocrossing interpolator, clock recovery circuits and decision logics. Main functions of the receiver has been verified. To My Parents ACKNOWLEDGEMENTS Just like any other theses, this one is done with the help from a lot of people. Among them, my supervisor Dr. Jack Lau is the first one to whom I would like to express my most sincere thanks. In these years of studies, he has been the most important source of support. What I have learnt from him is far beyond the scope of academic research. His optimistic character, unyielding will plus intellectual maturity form the key to success. Our whole research group has benefited from his foresight and creativity. It is an invaluable experience to have been with Dr. Jack Lau in the past 5 years. And I'm very grateful to those nice and talented professors of the EEE department for their excellent course materials and teaching attitudes. They deserve the greatest respect. It is their guidance, patience and encouragement that has led me to the exciting world of knowledge and innovation. During my first semester in HKUST, Dr. Howard Luong showed me the beauty of analog circuit designs, of which I had never been aware before. Dr. Chi-Ying Tsui, on the other hand, guided me through CMOS digital designs, from the very bottom to the system level. Dr. Roger Cheng introduced me to the mysterious world of personal wireless communication s...

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A novel digital FM receiver for mobile and personal communications

Kwon

Lee

1996

IEEE Trans. Commun.

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Recently, a digital baseband receiver called zerointermediate frequency zero-crossing demodulator (ZIFZCD) was developed for digital FM signal detection. ZIFZCD is applicable to many worldwide mobile and personal communications systems. In addition, ZIFZCD offers lower power consumption and simpler implementation, compared to the conventional analog implementation [e.g., a limiter-discriminator integrator and dump (LDI)] and the conventional digital implementation [e.g., the cross-differentiate-multiply demodulator (CDM)]. An objective of this paper is to introduce the ZIFZCD and report the biterror rate (BER) of the ZIFZCD under both static and fading environments. The analyzed and simulated BER results show that the ZIFZCD is comparable to the conventional CDM for a narrowband digital FM with modulation index 0.5, and the ZIFZCD is significantly better than the CDM for a wideband digital FM with modulation index larger than 1.5.

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A novel wireless communication device and its synchronization scheme

Cited by 10 publications

References 7 publications

Decision feedback postprocessor for zero-crossing digital FM demodulator

Decision feedback postprocessor for zero-crossing digital FM demodulator

A direct-conversion CMOS radio receiver for high speed paging

A novel digital FM receiver for mobile and personal communications

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