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 probability for the IS-95(A) indicate that the interleaver affects significantly system performance. Computer simulation results for iterative decoding show that performance gains in the order of 0.6 dB can be obtained when the sequential interleaver is replaced by a pseudorandom interleaver of same size. Improving iterative decoding for this code while maintaining the original sequential interleaver, results only in minor performance gains over published results.