NDLI: A digital Rayleigh fade compensation technique for coherent IJF-OQPSK systems

Content Provider	IEEE Xplore Digital Library
Author	Yang, J. Feher, K.
Copyright Year	1990
Description	Author affiliation: Dept. of Electr. Eng. & Comput. Sci., California Univ., Davis, CA, USA (Yang, J.; Feher, K.)
Abstract	A digital pilot-symbol-aided Rayleigh fade compensation technique for coherent intersymbol interference-jitter-free offset quadrature phase shift keying (IJF-OQPSK) is proposed. Instead of a fixed valued pilot symbol sequence, a scrambled pilot symbol sequence is transmitted to measure, and therefore to compensate for, the Rayleigh fading channel. The bit error rate (BER) performance of this system is investigated in fast Rayleigh fading, additive white Gaussian noise (AWGN), and cochannel interference (CCI) environments by using computer simulation. The simulated results show that a 2.5 dB improvement is achieved over the differentially detected pi /4-DQPSK at a BER of 10/sup -3/. Unlike the differentially detected pi /4-DQPSK, the system does not have an error floor or residual bit error, provided that the frame length N is not longer than the upper limit of frame length, N/sub max/. Another significant advantage is that the proposed IJF-OQPSK modulated signal is shown to suffer less spectral spreading than pi /4-QPSK signaling over a nonlinearly amplified channel.
Starting Page	732
Ending Page	737
File Size	395759
Page Count	6
File Format	PDF
ISSN	10903038
DOI	10.1109/VETEC.1990.110412
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-05-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bit error rate AWGN Computer errors Intersymbol interference Quadrature phase shift keying Fading Rayleigh channels Additive white noise Interchannel interference Radiofrequency interference
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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