Decoding of the IS-95A uplink code

This letter considers the decoding of the IS-95(A) uplink code in an effort to assess its best achievable performance, Union bounds on the bit error p robability for the IS-95(A) indicate that the interleaver affects significa ntly system performance. Computer simulation results for iterative decoding show that performance gains in the order of 0.6 dB can be obtained when th e sequential interleaver is replaced by a pseudorandom interleaver of same size. Improving iterative decoding for this code while maintaining the orig inal sequential interleaver, results only in minor performance gains over p ublished results.