Title :
Air-interface techniques for achieving high data rates for UMTS
Author :
Rosmansyah, Y. ; Sweeney, P. ; Tafazolli, R.
Author_Institution :
Centre for Commun. Syst. Res., Surrey Univ., Guildford, UK
Abstract :
Chip-level simulation results of QPSK, 8PSK, 16QAM and 64QAM modulation schemes with either rate-½ or rate-3/4 turbo codes (TCs) in wideband code division multiple access (WCDMA) downlink over various narrowband and wideband channels are presented. Post-decoding bit error rate (BER) is used as a performance measure. Implementation issues and achieved performance are discussed, particularly when space time transmit diversity (STTD) is employed. It is indicated that the STTD significantly improves the link performance in narrowband channels. In a wideband channel, however, the simple STTD processing enhances only the MPSK modulated link. A more elaborate STTD processing is required to improve the MQAM modulated link
Keywords :
AWGN channels; broadband networks; cellular radio; code division multiple access; decoding; diversity reception; error statistics; fading channels; multiuser channels; network interfaces; phase shift keying; quadrature amplitude modulation; quadrature phase shift keying; radio links; turbo codes; 16QAM; 64QAM; 8PSK; AWGN channel; BER; MQAM modulated link; QPSK; STTD processing; UMTS; WCDMA downlink; air-interface techniques; chip-level simulation results; code rate; fading channels; high data rates; link performance; narrowband channels; performance measure; post-decoding bit error rate; space time transmit diversity; turbo codes; wideband channels; wideband code division multiple access;
Conference_Titel :
3G Mobile Communication Technologies, 2001. Second International Conference on (Conf. Publ. No. 477)
Conference_Location :
London
Print_ISBN :
0-85296-731-4
DOI :
10.1049/cp:20010074
