A low complexity packet detection algorithm for a CPM modem

摘要

This paper discusses the design of a packet detection algorithm for a burst mode continuous phase modulation (CPM) modem over flat Rayleigh fading channels in the 220 MHz frequency band. The modem design focuses on bandwidth efficiency while maintaining good synchronization performance and low complexity. The packet structure meets the Federal Communications Commission frequency emission mask for the 220 MHz frequency band. The packet detection algorithm uses a degraded maximum likelihood (ML) amplitude estimate to provide the initial timing needed for synchronization and demodulation. The ML amplitude estimate is shown to be a function of a one dimensional parameter search. The parameter search is degraded to reduce complexity while maintaining an accurate amplitude estimate.