Turbo-SPC codes

This letter is concerned with a family of modified turbo-type codes, referr ed to as turbo-SPC (single parity check) codes. A technique based on the SP C code is introduced to replace puncturing for rate adjustment. A noticeabl e feature of the proposed scheme is the significantly reduced decoding comp lexity compared with the standard punctured turbo code. The cost reduction factor becomes more noticeable as rate increases lover ten times for rate - ->1). The error-rate floor problem known to turbo codes can also be improve d using the proposed scheme. For moderate to high rates, performances of ab out 0.5 dB from the theoretical limits at BER = 10(-5) have been observed f or turbo-SPC codes.