A combined OFDM/SDMA approach for WLAN

Author

Vandenameele, P. ; Thoen, Steven ; Engels, Marc ; De Mau, H.

Author_Institution

IMEC, Leuven, Belgium

Volume

2

fYear

1999

fDate

36342

Firstpage

1712

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 1999 IEEE 49th

Conference_Location

Houston, TX

ISSN

1090-3038

Print_ISBN

0-7803-5565-2

Type

conf

DOI

10.1109/VETEC.1999.780704

Filename

780704