APPLICATION OF ACOUSTIC CHARGE TRANSPORT TECHNOLOGY TO BLIND EQUALIZ ATION OF COMPLEX DIGITAL ....

THE ADVENT OF COMMUNICATION SYSTEMS EMPLOYING COMPLEX MODULATION FORMATS HAS IMPOSED INTERCEPT SYSTEMS. DEMODULATION OF SIGNALS SUCH AS 16 AND 64 AND 256 QAM SIGNALS REQUIRES MINIMIZING INTERSYMBOL INTERFERENCE AND IS POSSIBLE ONLY THROUGH THE USE OF ADAPTIVE EQUALIZATION. RECENTLY THERE HAS BEEN INCREASED INTERESTED IN UTILIZING BLIND EQUALIZATION METHODS FOR THIS PURPOSE -THAT IS, METHODS THAT DO NOT REQUIRE THE TRANSMISSION OF SPECIALIZED "TRAINING" SEQUENCES IN ORDER TO PERFORM THE EQUALIZATION FUNCTION. THE ADVENT OF ACOUSTIC CHARGE TRANSPORT DEVICES PROMISES TO PERMIT COST EFFECTIVE AND HIGH PERFORMING ADAPTIVE EQUALIZATION, AS COMPARED TO THE CURRENT EXPENSIVE ALL DIGITAL APPROACHES. THIS PROPOSED STUDY ADDRESSES THE APPLICATION OF ACOUSTIC CHARGE TRANSPORT TECHNOLOGY TO BLIND EQUALIZATION OF COMPLEX DIGITALLY MODULATED SIGNALS. IT IS DIRECTED TOWARD MILITARY AND OTHER U.S. GOVERNMENT AGENCIES REQUIREMENTS FOR RECONNAISSANCE/ECM AS WELL AS TOWARD GOVERNMENT COMMUNICATIONS APPLICATIONS. ANICIPATED BENEFITS/POTENTIAL COMMERCIAL APPLICATIONS - THE RESULTING STUDY WILL DETERMINE THE EFFECTIVENESS OF ACT TECHNOLOGY IN SOLVING THE PCM BLIND EQUALIZATION PROBLEM AND DEVELOPMENT ARCHITECTURES SUITABLE FOR EQUALIZER/DEMODULATOR DEVELOPMENT. PRINCIPLE EMPHASIS WILL BE TOWARD REDUCING THE COST OF SUCH EQUALIZATION VERSUS CURRENT ALL DIGITAL APPROACHES. KEY WORDS - EQUALIZATION, ACOUSTIC CHARGE TRANSPORT, ACT, PCM, ADAPTIVE FILTERING