Title :
Variable rate transmission and blind rate detection for coherent DS-CDMA mobile radio
Author :
Okumura, Yukihiko ; Adachi, Fumiyuki
Author_Institution :
Div. of Res. & Dev., NTT Mobile Commun. Network Inc., Kanagawa
fDate :
11/20/1997 12:00:00 AM
Abstract :
A variable rate data transmission and blind rate detection scheme is proposed for coherent DS-CDMA mobile radio. The data to be transmitted is first transformed into a QPSK symbol sequence, then multiplied by the rate-matched repetition code of `1, -1´. And finally spread over a wide bandwidth. At the receiver, the received signal is despread by a matched filter and non-coherent rate detection is applied. The despread signal sample sequence is then multiplied by a repetition code of detected rate to recover the original transmitted QPSK symbol sequence. The probability of rate detection error for a three-rate case is evaluated by computer simulations in a two-path Rayleigh fading channel
Keywords :
Rayleigh channels; code division multiple access; data communication; digital radio; fading; mobile radio; probability; quadrature phase shift keying; signal detection; QPSK symbol sequence; blind rate detection; coherent DS-CDMA mobile radio; computer simulations; despread signal sample sequence; matched filter; noncoherent rate detection; probability; rate detection error; rate-matched repetition code; repetition code; three-rate case; two-path Rayleigh fading channel; variable rate transmission;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19971402
