Title :
Adaptive modulation for multiuser orthogonal random beamforming systems
Author :
Kim, Chanhong ; Lee, Jungwoo
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea
Abstract :
In this paper, we present and analyze a rate-adaptive multiuser orthogonal random beamforming (ORBF) system. The goal is to maximize the average spectral efficiency (ASE) while satisfying a target bit error ratio (BER) constraint. We first derive the cumulative distribution function of the post-scheduling signal-to-interference-plus-noise ratio (SINR) with a new approach. The average BER and the ASE are derived as closed-form expressions. Finally, we obtain the optimal switching SINR thresholds maximizing the ASE under average BER constraint. Simulation results show performance improvement in terms of ASE.
Keywords :
MIMO communication; adaptive signal processing; array signal processing; error statistics; modulation; multi-access systems; statistical distributions; ASE; BER; adaptive modulation; cumulative distribution function; multiuser orthogonal random beamforming systems; post-scheduling signal-to-interference-plus-noise ratio; rate adaptive multiuser orthogonal random beamforming system; Adaptation model; Bit error rate; MIMO; Phase shift keying;
Conference_Titel :
Signal Processing Advances in Wireless Communications (SPAWC), 2010 IEEE Eleventh International Workshop on
Conference_Location :
Marrakech
Print_ISBN :
978-1-4244-6990-1
Electronic_ISBN :
1948-3244
DOI :
10.1109/SPAWC.2010.5670965
