Title :
Performance improvement methods for DECT and other non-coherent GMSK systems
Author :
Djen, Wing Shing ; Dang, Nam ; Feher, Kamilo
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA
Abstract :
A simple and low cost configuration, fourth-order premodulation Gaussian LPF (GLPF) paired with fourth-order postdiscriminator Butterworth LPF (BLPF), is demonstrated to yield robust performance in GMSK systems. Frequency drift of voltage-controlled oscillator (VCO) and IC-type mismatch will cause DC-offset during noncoherent demodulation. A DC-offset compensation technique based on the decision detection concept is investigated. By using this method, 40% and 80% of DC-offset is compensated within 0.5 dB of BER performance degradation. The use of a pseudo error monitor for DC-offset compensation is also proposed
Keywords :
compensation; cordless telephone systems; low-pass filters; minimum shift keying; radiofrequency filters; switched capacitor filters; DC-offset compensation; DECT; IC-type mismatch; decision detection; fourth-order postdiscriminator Butterworth LPF; fourth-order premodulation Gaussian LPF; low pass filters; noncoherent GMSK systems; noncoherent demodulation; pseudo error monitor; voltage-controlled oscillator; Band pass filters; Bit error rate; Circuit testing; Degradation; Demodulation; Digital communication; Frequency; Laboratories; Monitoring; Voltage-controlled oscillators;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245387
