THE CASE FOR MIS-MATCHED FILTERING IN NONLINEARLY AMPLIFIED FQPSK AND GSM INTER-OPERABLE SYSTEMS

Abstract

Structures for power-efficient systems, requiring the use of non-linear amplifiers and thus Mis-Matched filtering, are presented. These architectures allow for changeable amounts of power, bit rate, and modem selectable formats. The benefits include power/spectral efficiency, in addition to robust operation in mobile environments . Alternatives to matched filter receivers are addressed for power constrained systems associated with mobile systems in frequency selective channel environments. Two types of modulation format FQPSK[1][2][3] and GMSK[4], with different mismatch filters at the receiver, are analyzed.