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Power Control for Coded Frequency Hopping Cellular Systems
KTH, Superseded Departments, Signals, Sensors and Systems.
KTH, Superseded Departments, Signals, Sensors and Systems.ORCID iD: 0000-0003-4986-6123
1998 (English)Conference paper (Refereed)
Abstract [en]

Transmitter power control has proven to be a powerful technique to control interference  and improve the performance of wireless networks. Efficient power control normally re­  quires fast and reliable quality measurements. In cellular systems where propagation and  interference conditions vary rapidly, such real­time measurements cannot be obtained. In­  stead, diversity techniques can be useful. Frequency hopping combined with error control  coding is an example how this diversity can be implemented. These systems effectively  ''average'' the interference. How power control should be applied in these systems is,  however, not obvious.  In this paper, we show that symbol error performance in the uplink of a coded fre­  quency hopping cellular system is, at least in principle, minimized by maintaining the  received signal power at a constant level, provided that accurate instantaneous measure­  ments are available. When such instantaneous measurements are not available, but only  time averages this is no longer the optimum strategy. Therefore, also some signal­level  based power control schemes are analyzed with respect to their interaction with the error  control coding schemes used. Results show that power control schemes designed for static  channel allocation (without interference randomization) may give rise to severe fairness  problems in coded frequency hopping systems. It is also found that changing the code  parameters does not significantly affect the choice of power control policy.

Place, publisher, year, edition, pages
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Computer and Information Science
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URN: urn:nbn:se:kth:diva-28132OAI: diva2:383996
Nordic Radio Symposium
QC 20110111Available from: 2011-01-06 Created: 2011-01-06 Last updated: 2011-01-11Bibliographically approved

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