Title :
Convolutional codes with optimum distance spectrum
Author :
Frenger, Pål ; Orten, Pål ; Ottosson, Tony
Author_Institution :
Ericsson Res., Ericsson Radio Syst. AB, Stockholm, Sweden
Abstract :
New convolutional codes with rates 1/2, 1/3, and 1/4 are presented for constraint lengths ranging from 3 to 15. These new codes are maximum free-distance codes. Furthermore, the codes have optimized information error weights, resulting in a low bit-error rate for binary communication on both additive white Gaussian noise (AWGN) and Rayleigh fading channels. Improved coding gains of as much as 0.6 dB compared to previously published codes have been observed for coherent BPSK over a Rayleigh fading channel and a wide range of signal-to-noise ratios.
Keywords :
AWGN channels; Rayleigh channels; convolutional codes; error statistics; phase shift keying; AWGN channels; Rayleigh fading channels; additive white Gaussian noise; binary communication; coding gains; coherent BPSK; constraint lengths; convolutional codes; information error weights; low bit-error rate; maximum free-distance codes; optimum distance spectrum; rate 1/2 code; rate 1/3 code; rate 1/4 code; signal-to-noise ratio; AWGN channels; Additive white noise; Binary phase shift keying; Bit error rate; Convolutional codes; Fading; Gaussian noise; Pairwise error probability; Signal to noise ratio; Upper bound;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.803468
