A multitarget least-squares CMA (constant modulus algorithm) thatblindly adapts a narrowband beamformer to separate and capture multiplecommunication signals by exploiting only the low modulus variation ofthe communication waveforms is presented. It is shown that the algorithmcan detect and classify transient and nontransient communication signalson the basis of modulus variation and extract those signals with maximumattainable output SINR (signal-to-interference and -noise ratio) inenvironments containing strong transient or nontransient cochannelinterference. This is demonstrated via computer simulation for anarrowband (25 kHz bandwidth) four-element antenna array in environmentscontaining FSK (frequency shift keying) bursts received at low (~4 dBsignal-to-white-noise ratio) power levels in the presence of severe(~-50-dB signal-to-interference ratio) interference. It is shown thatthe algorithm can capture the FSK bursts in less than 2 ms, and maintaincapture on the signals as other signals appear and disappear over thesignal ON times
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