Title :
Designing PSAM schemes: How optimal are SISO pilot parameters for spatially correlated SIMO?
Author :
Zhou, Xiangyun ; Lamahewa, Tharaka A. ; Sadeghi, Parastoo ; Durrani, Salman
Author_Institution :
Coll. of Eng. & Comput. Sci., Australian Nat. Univ., Canberra, ACT
Abstract :
We study the design parameters of pilot-symbol-assisted modulation (PSAM) schemes for spatially correlated single-input multiple-output (SIMO) systems in time-varying Gauss-Markov flat-fading channels. We use an information capacity lower bound as our figure of merit. We investigate the optimum design parameters, including the ratio of power allocated to the pilots and the fraction of time occupied by the pilots, for SIMO systems with different antenna sizes and with spatial channel correlation. Our main finding is that by optimally designing the training parameters for single-input single-output (SISO) systems, the same parameters can be used to achieve near optimum capacity in both spatially independent and correlated SIMO systems for the same fading rate and signal-to-noise ratio (SNR). In addition, we show that spatially independent channels give the lowest capacity at sufficiently low SNR. These findings provide insights into the design of practical PSAM systems.
Keywords :
Gaussian channels; Markov processes; antenna arrays; fading channels; radio networks; SIMO systems; pilot-symbol-assisted modulation; signal-to-noise ratio; spatial correlated single-input multiple-output; time-varying Gauss-Markov flat-fading channels; Channel capacity; Channel estimation; Fading; GSM; Gaussian channels; MIMO; Power distribution; Receiving antennas; Resource management; Time varying systems;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on
Conference_Location :
Cannes
Print_ISBN :
978-1-4244-2643-0
Electronic_ISBN :
978-1-4244-2644-7
DOI :
10.1109/PIMRC.2008.4699449