Paper Info
Title
Effective spectral efficiency for adaptive QAM with diversity and pilot assisted channel estimation
Abstract
This paper investigates the effects of non-ideal channel state information in adaptive M-ary quadrature amplitude modulation systems with subset diversity. The slow adaptive modulation (SAM) technique, which adapts the modulation parameters to slow channel variations, is considered. With respects to fixed scheme modulation systems, SAM achieves a good gain in terms of spectral efficiency (SE) and outage probability and, compared to fast adaptive modulation, reduces the system complexity by lowering the feedback rate. Resources dedicated to channel estimation affect both the system performance, in terms of error and outage probability, and the effective SE for which a proper definition is needed. Here, we evaluate the performance of SAM technique when pilot-assisted channel estimation errors are considered. Taking into account the number of pilot symbols transmitted, an effective SE is obtained to address the tradeoff between channel estimation quality and SE.
Year
DOI
Venue
2009
10.1109/ISWCS.2009.5285252
ISWCS'09 Proceedings of the 6th international conference on Symposium on Wireless Communication Systems
Keywords
DocType
Citations 
fixed scheme modulation system,outage probability,non-ideal channel state information,pilot-assisted channel estimation error,channel variation,adaptive qam,slow adaptive modulation,modulation parameter,adaptive modulation,effective se,effective spectral efficiency,channel estimation quality,error probability,adaptive systems,lead,spectral efficiency,modulation,shadow mapping,signal to noise ratio,fading,quadrature amplitude modulation,channel state information,system performance
Conference
2
PageRank 
References 
Authors
0.38
11
4
Name
Order
Citations
PageRank
Laura Toni118615.22
Andrea Conti2215.47
Flavio Zabini3579.18
Oreste Andrisano425141.31