DocumentCode :
1512433
Title :
Predicting the outage performance of an equalized-QPSK system over indoor wireless channels
Author :
Daneshrad, Babak ; Cimini, Leonard J., Jr.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Volume :
3
Issue :
5
fYear :
1999
fDate :
5/1/1999 12:00:00 AM
Firstpage :
125
Lastpage :
127
Abstract :
The need to design wide-band wireless indoor systems with low outage probabilities (on the order of 1% to 2%) implies the need to study system performance at the 99th percentile as a function of several variables. We investigate the performance of a 15-MBaud quantenary phase-shift-keying (QPSK) system combined with decision-feedback equalization. The study attempts to identify, and quantify, trends in the system outage performance as a function of the equalizer span, the ensemble averaged RMS-delay-spread (/spl tau/~/sub RMS/) of the environment, and the ensemble averaged input signal-to-noise ratio (SNR). We introduce a novel figure of merit 99%-SNR-loss, which when plotted as a function of the normalized-equalizer-span shows a trend in the system´s outage performance as a function of the desired parameters. These suggest a pattern that can help predict, to the first order, the performance of such a system without the need to resort time-consuming simulations. The results suggest a 0.79-dB improvement in the 99%-SNR-loss per normalized equalizer and a 2-dB improvement with a doubling of /spl tau/~/sub RMS/ with the same normalized equalizer span.
Keywords :
decision feedback equalisers; delays; indoor radio; probability; quadrature phase shift keying; telecommunication channels; SNR-loss; decision-feedback equalization; ensemble averaged RMS-delay-spread; equalized-QPSK system; figure of merit; indoor wireless channels; input signal-to-noise ratio; low outage probabilities; normalized-equalizer-span; outage performance prediction; performance; quantenary phase-shift-keying; system performance; wide-band wireless indoor systems; Bit error rate; Decision feedback equalizers; Field-flow fractionation; Filters; Frequency synchronization; Predictive models; Quadrature phase shift keying; Signal processing; System performance; Wideband;
fLanguage :
English
Journal_Title :
Communications Letters, IEEE
Publisher :
ieee
ISSN :
1089-7798
Type :
jour
DOI :
10.1109/4234.766844
Filename :
766844
Link To Document :
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