Title :
Adaptive antennas at the mobile and base stations in an OFDM/TDMA system
Author :
Wong, Kai-Kit ; Cheng, Roger S K ; Letaief, Khaled ; Murch, Ross D.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., China
fDate :
1/1/2001 12:00:00 AM
Abstract :
Several smart antenna systems have been proposed and demonstrated at the base station (BS) of wireless communications systems, and these have shown that significant system performance improvement is possible. We consider the use of adaptive antennas at the BS and mobile stations (MS), operating jointly, in combination with orthogonal frequency-division multiplexing. The advantages of the proposed system includes reductions in average error probability and increases in capacity compared to conventional systems. Multiuser access, in space, time, and through subcarriers, is also possible and expressions for the exact joint optimal antenna weights at the BS and MS under cochannel interference conditions for fading channels are derived. To demonstrate the potential of our proposed system, analytical along with Monte Carlo simulation results are provided
Keywords :
Monte Carlo methods; OFDM modulation; adaptive antenna arrays; channel capacity; cochannel interference; error statistics; fading channels; land mobile radio; multiuser channels; time division multiple access; BER; Monte Carlo simulation results; OFDM/TDMA system; adaptive antennas; average error probability; base stations; cochannel interference; exact joint optimal antenna weights; fading channels; mobile stations; multiuser access; orthogonal frequency-division multiplexing; smart antenna systems; subcarriers; system capacity; system performance; wireless communications systems; Adaptive arrays; Base stations; Capacity planning; Error probability; Frequency division multiplexing; Mobile antennas; OFDM; System performance; Time division multiple access; Wireless communication;
Journal_Title :
Communications, IEEE Transactions on
