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Abstract
The phase-only transmit nulling method is widely used in narrowband arrays, but there are few reports of its application in wideband arrays. This paper describes the implementation of adaptive transmit nulls in wideband arrays based on subband phase-only pattern synthesis behind each array element. The filter bank behind each array element partitions the transmit signal into independent subbands and utilizes a phase shifter group in each subband to form frequency invariant spatial nulls in the array’s transmit pattern. The scheme developed in this paper includes an algorithm for computing a wideband phase-only weight vector and a subband phase-only adaptive signal processing method based on band partitioning. The validity of the scheme is proven by theoretical analysis and simulation experiments.
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