We discuss a procedure for designing high rate serial concatenated convolutional codes (SCCCs) via puncturing for BPSK/QPSK channels. Rate 3/4, 7/8, and 15/16 SCCCs are considered with constituent encoder memory size m up to 4. We have also analytically found that the error rate floors for the designed codes are much lower than those of the PCCCs for the rates of interest.

We discuss a procedure for designing high-rate turbo-codes via puncturing, with applications to BPSK/QPSK channels. Rates in the form k/(k+1), 2/spl les/k/spl les/16, are considered for constituent encoders with memory sizes m=3 and 4. The algorithm includes the selection of constituent encoder generator polynomials, puncture patterns, and interleavers with the goal of maximizing the minimum codeword weight for weight-two and weight-three inputs. The performance of the proposed codes are found via computer simulation and are observed in each case to be less than 0.9 dB (m=3), and 0.75 dB (m=4), from their respective channel capacity limits at a bit-error rate of 10/sup -5/. We consider two applications of punctured turbo-codes.

We discuss a procedure for the design of high rate turbo codes via puncturing, with applications to BPSK/QPSK channels. Rates in the form k/(k+1), 2/spl les/k/spl les/16, are considered for constituent encoders with memory size m=4. The algorithm includes the selection of constituent encoder generator polynomials, puncture patterns, and interleavers with the goal of maximizing the minimum codeword weight for weight-two and weight-three inputs. The bit error rate (BER) performance of the proposed codes are found via computer simulation and are observed in each case to be about 0.7 dB from their respective channel capacity limits at a BER of 10/sup -5/.