Dojun Rhee

Error performance analysis of a concatenated coding scheme with 64/256-QAM trellis coded modulation for the north American cable modem standard

Concatenated coding schemes with Reed-Solomon (RS) coding in the outer stage and trellis coded modulation (TCM) in the inner stage are analyzed. The TCM decoder incorporates a Viterbi decoder compliant with ITU-T Recommendation J.83, Annex B (north American digital video transmission specifications for multimedia cable network system (MCNS)). The module is suitable as the inner stage for a concatenated decoding scheme. A triple-error-correcting extended RS (128,122,7) code is used in the outer stage. Union bounds on the bit error performance of concatenated coding schemes, over 64- and 256-QAM signal constellations over AWGN channels are derived and verified by computer simulations. The effects of quantization of input symbols and of trace-back depth in the Viterbi decoder are simulated as well.

On the error performance of 8-VSB TCM decoder for ATSC terrestrial broadcasting of digital television

The error performance of various 8-VSB TCM decoders for reception of terrestrial digital television is analyzed. In previous work, 8-state TCM decoders were proposed and implemented for terrestrial broadcasting of digital television. In this paper, the performance of a 16-state TCM decoder is analyzed and simulated. It is shown that not only a 16-state TCM decoder outperforms one with 8-states, but it also has much smaller error coefficients.

On unequal error protection Reed-Muller codes

It is well known that Reed-Muller (RM) codes are not linear unequal error protection (LUEP) codes because the set of minimum-weight vectors span Reed-Muller codes (punctured or not). In this paper, we show that most RM codes are LUEP codes if RM codes are encoded with a recursively decomposed trellis oriented generator matrix (TOGM) and maximum-likelihood trellis decoding is used.

A low-complexity and high-performance concatenated coding scheme for high-speed satellite communications

This paper presents several concatenated coding scheme for high-speed satellite communications. The NASA Standard (255, 223) Reed-Solomon (RS) code over GF(2/sup 8/) is used as the outer code and a Reed-Muller (RM) code is used as the inner code. A simple trellis diagram with parallel structure for the RM code is devised. This concatenated scheme achieves high-performance with high decoding speed and low complexity.