Title :
Wideband CDMA packet data with hybrid ARQ
Author :
Raitola, Mika ; Holma, Had
Author_Institution :
Nokia Telecommun. Radio Access Syst., Finland
Abstract :
The performance of wideband CDMA packet data with soft combining of packets is analysed. First, the main parameters of W-CDMA (wideband CDMA) are presented. W-CDMA refers to the air interface that was decided by the ETSI to be standardised for the UMTS air interface for paired bands. Secondly, the W-CDMA packet transmission scheme with soft combining of packets is introduced. Soft combining indicates the combining of the soft values of the unsuccessful transmission with the retransmission before feeding them to the channel decoder. The performance of soft combining is compared to the performance of noncombining packet solution. The results show that soft combining can increase the capacity and extend the cell range up to 2 dB against Gaussian noise if no fast power control is used. With fast power control the gain is 0.3-2.0 dB. Soft combining can also be used to decrease the maximum packet delays. It is also shown that using slow power control instead of fast power control can increase the packet data capacity in the downlink
Keywords :
Gaussian noise; automatic repeat request; broadband networks; cellular radio; code division multiple access; data communication; decoding; delays; packet radio networks; power control; radio links; spread spectrum communication; telecommunication control; 0.3 to 2.0 dB; ETSI; Gaussian noise; UMTS; W-CDMA; air interface; cell range; channel decoder; downlink; fast power control; gain; hybrid ARQ; maximum packet delays; noncombining packet; packet data capacity; packet transmission; paired bands; performance; retransmission; slow power control; soft packet combining; unsuccessful transmission; wideband CDMA packet data; 3G mobile communication; Automatic repeat request; Decoding; Gain; Gaussian noise; Multiaccess communication; Performance analysis; Power control; Telecommunication standards; Wideband;
Conference_Titel :
Spread Spectrum Techniques and Applications, 1998. Proceedings., 1998 IEEE 5th International Symposium on
Conference_Location :
Sun City
Print_ISBN :
0-7803-4281-X
DOI :
10.1109/ISSSTA.1998.726250
