Title :
Low frequency suppression of baseband coded sequences
Author :
Botha, L. ; Ferreira, H.C.
Author_Institution :
Cybernetics Lab., Rand Afrikaans Univ., Aucklandpark, South Africa
Abstract :
Two classes of sequences with favourable low frequency spectral suppression are considered. They are sequences with higher order zeroes at zero frequency and sequences which comply to restrictions on the time between crossings of the average RDS value. It is shown how these sequences can be used to transmit a conventional analog speech channel on the same channel as a digital signal, but totally independent from it. An optimization problem regarding the choice of a code sequence for a specific application is then considered, and finally a new code with suppressed low frequencies is presented
Keywords :
binary sequences; codes; interference suppression; subscriber loops; analog speech channel; asymmetrical digital subscriber line; baseband coded sequences; binary sequences; digital signal; higher order zeroes; low frequency spectral suppression; optimization problem; zero frequency; Africa; Baseband; Communication channels; Couplings; Cybernetics; Decision support systems; Frequency; Intersymbol interference; Laboratories; Speech;
Conference_Titel :
Communications and Signal Processing, 1993., Proceedings of the 1993 IEEE South African Symposium on
Conference_Location :
Jan Smuts Airport
Print_ISBN :
0-7803-1292-9
DOI :
10.1109/COMSIG.1993.365875
