Title :
A combined OFDM/SDMA approach for WLAN
Author :
Vandenameele, P. ; Thoen, Steven ; Engels, Marc ; De Mau, H.
Author_Institution :
IMEC, Leuven, Belgium
Abstract :
Wireless LANs (WLANs) still offer low capacity compared to wired LANs. The two major obstacles towards increasing the capacity are (a) distortion due to the indoor channel and (b) limitations on the bandwidth-power budget. In this paper we propose an OFDM/SDMA approach that combines orthogonal frequency division multiplexing (OFDM), for multipath channel distortion mitigation, with SDMA, for bandwidth efficiency. In addition, our approach concentrates all SDMA functionality in the basestation, which reduces the overall system cost. We give algorithms for both the uplink and downlink, determine their performance and analyse their implementation complexity. It is shown that OFDM/SDMA enables high-capacity WLANs at reasonable implementation complexity
Keywords :
AWGN channels; OFDM modulation; computational complexity; indoor radio; least mean squares methods; least squares approximations; multipath channels; multiuser channels; radio links; signal detection; space division multiple access; wireless LAN; AWGN channels; OFDM/SDMA; bandwidth efficiency; bandwidth-power budget limitation; basestation; distortion; downlink; high-capacity WLAN; implementation complexity; indoor channel; linear LS detection; multipath channel distortion mitigation; nonlinear MLSE detection; orthogonal frequency division multiplexing; performance; system cost reduction; uplink; wireless LAN; Bandwidth; Consumer electronics; Costs; Delay; Downlink; Multiaccess communication; Multipath channels; OFDM modulation; Transmitting antennas; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.780704
