Accession Number : ADA307245

Title :   Radiated Power Control For Narrow-Band Digital Links.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Hsu, Hsien-Ming

PDF Url : ADA307245

Report Date : MAR 1996

Pagination or Media Count : 69

Abstract : Radiated power control is one way to increase the capacity of a narrow band channel with channel reuse. But channel reuse introduces the problem of cochannel interference. Use of a power control algorithm not only can optimize the radiated power for a particular quality of service (QOS) but also minimize cochannel interference at the receiver. In this thesis, we present the experimental results that relate the dependency of the logarithm of bit error rate (BER) versus the logarithm of the ratio of the energy per bit to the one sided noise power spectral density (E(sub b)/N). The dependency of BER to E(sub b)/N(sub 0) in an deal and to E(sub b)/N in a nonideal thermal noise limited receiver were analyzed. One important step in the analysis is the procedure of curve fitting used to characterize the radiated power for a particular system. In addition, we perform the experiments of BER measurement with a fixed power at a fixed location and the experiment to obtain the relationship between BER and the transmission distance with fixed radiated power. A curve fitting procedure to find the selected system parameter p is based on the results of BER measurement at a fixed distance with variable power. The fixed step power control algorithm is also presented here. Experimental results are shown and compared to results expected from theory.

Descriptors :   *RADIO INTERFERENCE, CONTROL, RADIATION, SIGNAL TO NOISE RATIO, THESES, POWER SPECTRA, TRANSMITTANCE, QUALITY, RECEIVERS, ERRORS, LOGARITHM FUNCTIONS, CHANNELS, NOISE(RADIO), NARROWBAND, THERMAL RESISTANCE, CURVE FITTING.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE