Frequency offset effects on maximin algorithm with a step-length estimation technique

The Maximin algorithm, proposed by Torrieri and Bakhru, adaptively updates the weights of an antenna array to provide simultaneous interference suppression and beamforming in a frequency hopping (FH) communication system. The Maximin algorithm is named such because the desired signal is enhanced and the interference is suppressed simultaneously. And the Maximin shows good performance under a broadband tone interference environment, but poor performance under frequency offset and friendly interference, i.e., a data-modulated interference environment. This paper analytically derives how the frequency offset affects on the Maximin algorithm and verifies the analytical results with simulation results. In addition, this paper proposes to use the recently published MOSTLE algorithm because the MOSTLE is robust against frequency offset and friendly interference.