Performance of the /spl pi//4-DQPSK, GMSK, and QAM modulation schemes in mobile radio with multipath fading and nonlinearities

As mobile communications have become so indispensable, every possible effort should be spent to achieve the optimum operating conditions. In addition to the normal impairments associated with wireless communications, in general, the mobile channel suffers from particular limitations that confine the...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 1997-05, Vol.46 (2), p.390-395
Main Authors: Hashem, B., El-Hennawey, M.S.
Format: Article
Language:English
Subjects:
Bandwidth
Digital modulation
Fading
Interference
Land mobile radio
Mobile communication
Operational amplifiers
Power amplifiers
Quadrature amplitude modulation
Wireless communication
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Summary:As mobile communications have become so indispensable, every possible effort should be spent to achieve the optimum operating conditions. In addition to the normal impairments associated with wireless communications, in general, the mobile channel suffers from particular limitations that confine the performance of a mobile radio system. Among those impairments are the bandwidth limitation, interference, and multipath fading. With the strong motivation toward portable radio and personal communication systems, power limitation has manifest itself in the picture, and, consequently, nonlinear operation of the amplifiers involved (hence, the channel) will have to be dealt with. Constant envelope modulation schemes have been used in digital mobile radio systems recently installed. The Gaussian minimum shift keying (GMSK) is employed in the Global System for Mobile (GSM) communications installed in Europe, while in the North American IS-54 system, the modulation scheme used is the /spl pi//4-DQPSK. As the quest for higher data rates has kept on increasing, multilevel modulation schemes have been proposed with their performance over nonlinear channels having been overlooked. The paper provides a comparative study, based on simulation, and tests the performance of various modulation schemes operating over a wide variety of mobile radio channel conditions. The effective throughput of all systems is also considered.
ISSN:0018-9545
1939-9359
DOI:10.1109/25.580777