PERFORMANCE OF SELECTED CODED DIRECT-SEQUENCE RECEIVER STRUCTURES IN PULSED INTERFERENCE.

The authors consider the performance of short constraint-length convolutional codes in conjunction with coherent BPSK direct-sequence spread-spectrum modulation in a variety of pulsed interference scenarios. The use of several types of imperfect interference estimation mechanisms and the resulting impact on Viterbi decoder bit error probability performance are explored. The digital receiver structures eliminate the need for a fast-acting analog AGC circuit which is often susceptible to spoofing. For the short constraint-length codes under consideration, upper bounds on bit error probability performance under idealized channel modeling assumptions are provided. Departures from these idealized assumptions are analyzed through extensive Monte-Carlo computer simulation.