Title :
Space-time spreading assisted adaptive QAM aided multicarrier DS-CDMA video telephony
Author :
Chung, J.Y. ; Wei, H. ; Hanzo, L.
Author_Institution :
Sch. of Electron. & Comput. Sci., Southampton Univ., UK
Abstract :
A space-time spreading (STS) assisted near-instantaneously adaptive quadrature amplitude modulated (AQAM) multi-carrier CDMA (MC-DSCDMA) video transceiver is proposed and investigated. When the STS scheme is invoked for spreading the signal of each sub-carrier to multiple transmit antennas, the effects of channel-induced fading are substantially mitigated. Furthermore, turbo convolutional coding is invoked for enhancing the achievable BER versus SNR performance. The AQAM-aided STS MC-CDMA system was capable of maintaining a near-constant target BER and hence a near-constant video PSNR across a wide range of channel qualities, requiring a signal-to-noise ratio (SNR) as low as 7dB for achieving a perceptually pleasing video quality.
Keywords :
3G mobile communication; adaptive modulation; channel coding; code division multiple access; convolutional codes; error statistics; fading channels; quadrature amplitude modulation; space-time codes; spread spectrum communication; transceivers; turbo codes; videotelephony; BER; MC-DSCDMA; SNR performance; adaptive quadrature amplitude modulation; channel qualities; channel-induced fading; multi-carrier CDMA; multiple transmit antennas; near-constant video PSNR; near-instantaneously AQAM; perceptually pleasing video quality; signal-to-noise ratio; space-time spreading; turbo convolutional coding; video transceiver; videotelephony;
Conference_Titel :
3G Mobile Communication Technologies, 2004. 3G 2004. Fifth IEE International Conference on
Print_ISBN :
0-86341-388-9
DOI :
10.1049/cp:20040653
