Title :
Adaptive Modulation for Wireless Multihop Systems with Regenerative Relays
Author :
Müller, Andreas ; Speidel, Joachim
Author_Institution :
Inst. of Telecommun., Stuttgart Univ., Stuttgart
Abstract :
We present and analyze several adaptive modulation schemes for wireless multihop systems with regenerative relays. In particular, we consider both rate adaptation based on perfect channel state information (csi) of all hops as well as suboptimal strategies based on partial csi, which require only a very limited amount of feedback information and hence represent attractive approaches for practical systems. We thoroughly investigate the performance of all proposed schemes in terms of the average spectral efficiency as well as the average bit error rate, considering the important case of a Rayleigh-fading environment and M-ary quadrature amplitude modulation as a concrete example. Numerical results are shown to be in perfect agreement with simulation results - thus verifying the accuracy of our analysis and illustrate the performance of our schemes in various situations.
Keywords :
Rayleigh channels; adaptive modulation; error statistics; quadrature amplitude modulation; M-ary quadrature amplitude modulation; Rayleigh-fading environment; adaptive modulation schemes; feedback information; perfect channel state information; regenerative relays; wireless multihop systems; Baseband; Bit error rate; Channel state information; Concrete; Fading; Performance analysis; Quadrature amplitude modulation; Rayleigh channels; Relays; State feedback;
Conference_Titel :
Vehicular Technology Conference, 2008. VTC 2008-Fall. IEEE 68th
Conference_Location :
Calgary, BC
Print_ISBN :
978-1-4244-1721-6
Electronic_ISBN :
1090-3038
DOI :
10.1109/VETECF.2008.216