| || Changes in plasma leptin and zinc status of women mountaineers at high altitude
Author : Bhat, K.P.M. ;Nibandhe, Reena P.
Source : Defence Science Journal ; Vol:52(2) ; 2002 ; pp 205-209
Subject : 621.396.9 Radars
Keywords : Range generator ;Sensors ;FMCW radar ;Doppler radar ;Remote sensing ;Digital modulation
Abstract : The paper presents the design philosophy and hardware details of a range gate generator as presence sensor suitable for an X-band frequency-modulated continuous wave radar. A logic circuit to indicate the target presence between 20 m to 30 m with a maximum of ± 0.5 Count cycle-limited error has been designed and incorporated.
| || 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. "