Title :
Modified maximal ratio combining HARQ scheme for HSDPA
Author_Institution :
Nokia, Salo, Finland
Abstract :
One of the main evolutions of the WCDMA standard is the high-speed downlink packet access (HSDPA) concept, which offers peak data rates exceeding 10 Mbps. A hybrid automatic repeat request (HARQ) plays an important role in HSDPA. In this paper the impact of the combining scheme in HARQ to the system performance is considered. A conventional maximal ratio combining (MRC) is not an optimal method of combining (re)transmissions for the HARQ under the condition of the imperfect channel estimation. A modified MRC method is proposed, which allows decreasing the impact of the errors in the channel estimates to the performance of HSDPA.
Keywords :
automatic repeat request; broadband networks; channel estimation; code division multiple access; packet radio networks; radio links; HARQ scheme; HSDPA; WCDMA standard; channel estimation; code division multiple access; conventional maximal ratio combining; high-speed downlink packet access; hybrid automatic repeat request; Automatic repeat request; Channel estimation; Decoding; Diversity reception; Downlink; Multiaccess communication; Protocols; Surface acoustic waves; System performance; Transmitters;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on
Print_ISBN :
0-7803-8523-3
DOI :
10.1109/PIMRC.2004.1368760
