A single-carrier frequency-domain SDMA basestation

• Published in: 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100) Vol. 6; pp. 3714 - 3717 vol.6
• Main Authors: Vandenameele, P., Van der Perre, L., Gyselinckx, B., Engels, M., Moonen, M., De Man, H.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2000
• Subjects: Bandwidth; Costs; Digital signal processing; High power amplifiers; Multiaccess communication; OFDM modulation; Peak to average power ratio; Power amplifiers; Signal processing algorithms; Wireless networks
• ISBN: 9780780362932; 0780362934
• ISSN: 1520-6149; 2379-190X
• DOI: 10.1109/ICASSP.2000.860209

Two major technical challenges in the design of future broadband wireless networks are the impairments of the propagation channel and the need for spectral efficiency. We previously proposed a combined OFDM/SDMA approach that mitigates the channel impairments by orthogonal frequency division multiplexing (OFDM) with cyclic prefix insertion and that achieves a high spectral efficiency by space division multiple access (SDMA). However, because of the multicarrier modulation, this approach requires high-backoff power amplifiers in the analog frontend. We present a SC-FD-SDMA basestation, which avoids these expensive amplifiers by using constant-envelope single-carrier (SC) modulation and still features the advantages of frequency-domain (FD) multipath mitigation and SDMA. We pay special attention to the initialization of such basestation and its fixed point requirements, since they are critical aspects of any realistic implementation. A case-study shows how SC-FD-SDMA enables a 100 Mbps wireless LAN with a bandwidth efficiency of 8 bps/Hz and an uncoded BER of 10/sup -3/ at 13.5 dB.