Abstract

A beamforming algorithm is presented for the uplink of a slow frequency-hopping wireless access point which does not require prior knowledge of direction-of-arrival. The algorithm is motivated by Bluetooth and 802.11 FH networks, in which training sequences are transmitted to establish connections. Using prior knowledge of the training sequence, or post-beamforming data decisions, it is shown that correlation matrices containing interference-only and interference-plus-signal are readily formed. SNR maximization techniques are then employed to jointly suppress interference spatially, and beamform in the direction of the desired signal. Algorithms for joint synchronization and beamforming are also presented, and overall system performance is evaluated via simulation and bit-error rate analysis.

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