Approximate Maximum Likelihood Estimation of Rician K-Factor and Investigation of Urban Wireless Measurements
2013 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 12, no 6, 2545-2555 p.Article in journal (Refereed) Published
We consider the problem of estimating the K-factor of a Rician fading wireless channel based on observations of the envelope only, i.e., without phase-information. An approximate Rician power density function (pdf) is introduced to overcome the complexity of the exact pdf. A closed-form maximum-likelihood estimator is derived based on this approximate Rician pdf, while a maximum-likelihood estimator based on the exact Rician pdf appears to be infeasible. An improved estimator is also proposed that features less bias and less variance than the first estimator. The performance of the latter estimator is compared to moment-based estimators that were previously proposed in the literature and is found to have superior performance to closed-form moment estimators, especially for low sample numbers and/or large K-values. The estimator is applied to real wireless macro-cell urban-area measurements. The results show generally low K-factors (below 3dB), with occasional higher values in particular circumstances.
Place, publisher, year, edition, pages
2013. Vol. 12, no 6, 2545-2555 p.
K-factor, maximum likelihood estimation, approximate pdf, bias, variance, wireless channel measurements
Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
IdentifiersURN: urn:nbn:se:kth:diva-127511DOI: 10.1109/TWC.2013.042413.111734ISI: 000321201200001ScopusID: 2-s2.0-84880164429OAI: oai:DiVA.org:kth-127511DiVA: diva2:644474
QC 201308302013-08-302013-08-302013-08-30Bibliographically approved