Adaptive antenna array techniques for use in an orthogonal frequency division
multiplexed spread-spectrum multi-access (OFDM-SSMA) cellular wireless system or
other type of wireless communication system. A base station of the system includes
an antenna array and a base station receiver. The base station receiver implements
an adaptive antenna gain algorithm which estimates a spatial covariance matrix
for each of K mobile stations communicating with the base station. The spatial
covariance matrix for a given one of the mobile stations is determined at least
in part based on a unique hopping sequence of the mobile station, and provides
a correlation between signals received from the mobile station at different antenna
elements within the antenna array. An average spatial covariance matrix for a set
of received signals is also generated. The individual spatial covariance matrices
and the average spatial covariance matrix are processed to generate an estimate
of an interference matrix for the K mobile stations, and the estimate of the interference
matrix is further processed to generate array responses for each of the mobile
stations. The array response for a given mobile station is processed to determine
an antenna weighting which is applied to a signal received from the given mobile
station in order to facilitate detection of a corresponding transmitted symbol.
