Comparison between multicode with fixed spreading and single code with variable spreading options in UTRA/TDD

Author

Agin, Pascal ; Gourgue, Frederic

Author_Institution

Alcatel CIT, Velizy, France

fYear

1999

fDate

1999

Firstpage

325

Lastpage

328

Abstract

Europe is proposing a system called the Universal Mobile Telecommunication System (UMTS) as a candidate for IMT-2000. It is characterized by a FDD and a TDD mode, both with a CDMA component. Two options are being considered for the spreading for the TDD mode: a multicode option, where each user may have several codes of fixed length, and a single code option, where each user always has one code, but with a variable length. This paper compares the peak-to-average ratio as well as the receiver complexity and performances for both options. It shows that the single code option enables to decrease the complexity by up to 50% and to increase the performances by up to 1 dB, compared to the multicode option. The single code option allows in addition a reduced peak-to-average ratio of the RF signal, resulting in a more efficient power amplifier

Keywords

code division multiple access; computational complexity; land mobile radio; radio receivers; time division multiplexing; 1 dB; CDMA; FDD; IMT-2000; RF signal; TDD; UMTS; UTRA; Universal Mobile Telecommunication System; fixed spreading multicode; peak-to-average ratio; performances; power amplifier; receiver complexity; spreading; variable spreading; variable spreading single code; 3G mobile communication; Bit rate; Code standards; Europe; Modulation coding; Multiaccess communication; Peak to average power ratio; Power amplifiers; Radiofrequency amplifiers; Telecommunication standards;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Advances in Wireless Communications, 1999. SPAWC '99. 1999 2nd IEEE Workshop on

Conference_Location

Annapolis, MD

Print_ISBN

0-7803-5599-7

Type

conf

DOI

10.1109/SPAWC.1999.783084

Filename

783084