Title :
Pre-coding based multi-user OFDM system
Author :
Nerma, Mohamed Hussien Mohamed ; Kamel, Nidal ; Min, Yew Kuan ; Jeoti, Varun
Abstract :
In most communication system, multiple users need to be supported. In OFDM systems, multiple access is achieved through combining TDMA and FDMA. OFDM supports multiusers with popular multiple access schemes, these schemes are MC - CDMA and OFDMA. In this paper we propose a precoding based approach to multiple access in OFDM systems using singular value decomposition (SVD). The scheme is like a CDMA scheme, in that the entire bandwidth can be used at all times, except that it does not entail expanding the bandwidth. This scheme combats the Multiuser Interference (MUI) caused by other users.
Keywords :
OFDM modulation; channel coding; code division multiple access; frequency division multiple access; multiuser channels; precoding; radiofrequency interference; singular value decomposition; time division multiple access; FDMA; MC-CDMA; TDMA; multiple access scheme; multiuser OFDMA system; multiuser interference; precoding matrix; singular value decomposition; Bandwidth; Frequency conversion; Frequency division multiaccess; Frequency domain analysis; Interference; Multiaccess communication; OFDM; Singular value decomposition; Time division multiple access; Transmitters; CDMA; FDMA; MC - CDMA; Multiuser Interference (MUI); OFDM; OFDMA; Orthogonal-triangular decomposition (QR); Singular value decomposition (SVD); TDMA; pre-coding;
Conference_Titel :
Intelligent and Advanced Systems, 2007. ICIAS 2007. International Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-1355-3
Electronic_ISBN :
978-1-4244-1356-0
DOI :
10.1109/ICIAS.2007.4658427
