Measurements of RF Radiation in the Vicinity of FM and TV Broadcasting Stations

This paper provides measurements of power density around an FM and VHF-TV broadcasting station and its variation with distance.  The maximum measured value was about 2.4 mW/cm2 at a height of 2 meters above ground level while the average value was fluctuating around 1 mW/cm2.  It was found that the measured power density increases with height above ground and it reaches about 3.5 mW/cm2 at a height of about 15 meters at a location of about 400 meters from the station.  At a nearer distance of 185 meters from the tower another measurement was taken at a height of 18 meters, the power density increased to 41 mW/cm2

EFFICIENT ITERATIVE DECONVOLUTION OF NOISY WAVEFORMS.

A simplified but reliable design procedure is proposed for the deconvolution noise reduction compensators of S. M. Riad and Nahman-Guillaume. This procedure produces a compensator that yields close to optimum deconvolution results with the least possible iterations

Effect of constellation design, pulse shaping and BCH codes on performance of M-ary QAM transmitted over gaussian bandlimited channels

Computer simulation is used to study several issues relevant to the design of quadrature amplitude modulation (QAM) with M-ary alphabet. The QAM signals are transmitted over gaussian bandlimited channels. Signal constellations, pulse shaping, and error correcting codes are optimized for power and bandwidth efficiency. For each QAM channel, there exists an optimal transmission rate which depends on filtering, constellation design, pulse shaping, and equalization. Optimizing both the signal constellation and pulse shaping offer an appreciable gain, especially for higher signal alphabet and bandwidth efficiency. Finally, properly chosen BCH error-correcting code provides substantial coding gain especially at a high -ary and a high transmission rate