A Design of Space-Time Codes for CPFSK Modulation over Multipath Fading Channels

In this paper, we derive space-time code design criteria for continuous phase frequency-shift keying (CPFSK) over multipath fast fading channels, aiming at maximizing the overall space-time diversity. We also propose a space-time coding scheme to meet the dominated design criterion, the rank criterion. Our encoding scheme consists of a ring convolutional encoder and a spatial encoder with an extender in it. Both the theoretical and simulation results show that with the effective code length ECL of the convolutional encoder, L_T transmit antennas, L_R receive antennas, and L + 1 paths in the fading channel, a maximal overall diversity ECL ldr L_T ldr L_R ldr (L + 1) is achievable.