Method and apparatus for interference suppression in orthogonal frequency division multiplexed (OFDM) wireless communication systems

摘要

A method and apparatus for interference suppression in wireless communication systems, especially Orthogonal Frequency Division Multiplexed (OFDM) systems, is presented. The array apparatus includes a two-tier adaptive array system, which provides for both spatial diversity and beamforming at the uplink and includes sub-arrays spaced at a distance sufficient to provide spatial diversity and support beamforming or scanning. A Direction of Arrival (DOA) of signals impinging upon the array can be calculated by comparing signals from sub-array elements. Each sub-array can be filtered or beamformed to provide high gain to desired signals received from the DOA (which may be a multipath signal) while simultaneously dampening-out undesired signals, such as co-channel interference (CCI) in the frequency band of operation. The DOA is also used for allocating frequency bins for data signals, such as in an OFDM system, to provide weighted guidelines for bin allocation to maximize received signal power.

主权项

1. An apparatus for processing signals received from a plurality of remote transceivers, the apparatus comprising:
at least two beamformers, each beamformer being associated with a corresponding antenna sub-array having at least two antenna elements, and being configured to:
receive at least two base signals associated with at least two carrier signals corresponding to a frequency bin allocated to a user, the at least two carrier signals being associated with the at least two antenna elements of the corresponding antenna sub-array; andgenerate an output signal as a weighted sum of the at least two base signals, associated with the at least two carrier signals, based on directions of arrival of the at least two carrier signals; and a spatial diversity combiner configured to selectively combine at least two output signals, corresponding to the frequency bin allocated to the user, of the at least two beamformers.