Title :
Adaptive antenna arrays for OFDM systems with cochannel interference
Author :
Li, Ye Geoffrey ; Sollenberger, Nelson R.
Author_Institution :
Dept. of Wireless Syst. Res., AT&T Labs.-Res., Red Bank, NJ, USA
fDate :
2/1/1999 12:00:00 AM
Abstract :
Orthogonal frequency-division multiplexing (OFDM) is one of the promising techniques for future mobile wireless data systems. For OFDM systems with cochannel interference, adaptive antenna arrays can be used for interference suppression. This paper focuses on a key issue for adaptive antenna arrays, that is, parameter estimation for the minimum mean square error (MMSE) diversity combiner (DC). Using the instantaneous correlation estimation approach developed in the paper, an original parameter estimator for the MMSE-DC is derived. Based on the original estimator, we propose an enhanced parameter estimator. Extensive computer simulation demonstrates that the MMSE-DC using the proposed parameter estimators can effectively suppress both synchronous and asynchronous interference in OFDM systems for packet and continuous data transmission
Keywords :
OFDM modulation; adaptive antenna arrays; array signal processing; cochannel interference; correlation methods; data communication; diversity reception; interference suppression; land mobile radio; least mean squares methods; parameter estimation; MMSE diversity combiner; MMSE-DC; OFDM systems; adaptive antenna arrays; asynchronous interference; cochannel interference; computer simulation; continuous data transmission; instantaneous correlation estimation; interference suppression; minimum mean square error; mobile wireless data systems; orthogonal frequency-division multiplexing; packet data transmission; parameter estimation; synchronous interference; Adaptive arrays; Antenna arrays; Computer simulation; Data systems; Frequency division multiplexing; Interchannel interference; Interference suppression; Mean square error methods; OFDM; Parameter estimation;
Journal_Title :
Communications, IEEE Transactions on
