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 | Hardware implementation of pi/4-DQPSK modem for mobile communication
Author : Bhat, K. P. M.;Jogdand, Saurabh;Malshe, Salil;Kelkar, Vasundhara
Source : Defence Science Journal ; Vol:51(3) ; 2001 ; pp 315-320
Subject : 681.2 Instrumentation
Keywords : Mobile communication;Digital modulation;Dibit transformation;Analog multiplexer;Modulator hardware
Abstract : "Spectrally efficient digital modulation schemes for land mobile voice transmission applications highlighting advantages of a 7Pi/4-DQPSK modem are briefly reviewed, A procedure to generate 7Pi/4-DQPSK signal by directly mapping pairs of input bits through dibit transformation function and analog multiplexer is described. Details of modulator hardware for a standard data rate of 48 kbps are also incorporated, A promising all-digital receiver structure which lends itself for miniaturisation, is described. " |
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