Frequency Hopped M-arcy Frequency Shift Keyed Communications Using List Metric Decoding Over Jamming and Multiple Access Channels

摘要

List metric decoding is applied to anti-jam and multiple access communication systems that employ frequency-hopped, M-ary Frequency Shift Keyed (MFSK) modulation. The performance of these systems over Guassian noise and Rayleigh fading channels is analyzed by deriving expressions for the cutoff rate parameter RO, and evaluating numerical examples. RO represents the largest reliable data rate per coded symbol that could be achieved, with a particular system and channel, by using practical coding methods. Because it is code-independent, RO is used as the basis for comparing list decoding against hard and soft decisions, without the encumbrance of analyzing specific error correcting codes. RO is then used later, along with a code-dependent function, to upper bound the bit error probability provided by a particular code. In a list decoding receiver, decisions are based on the relative magnitudes of the demodulator's energy detector outputs.