MC-CDMA based architecture for the downlink of infrastructure WLANs

In this paper we propose a multicarrier code division multiple access (MC-CDMA) based architecture with variable spreading factor for the downlink of infrastructure wireless local area networks (WLANs). The objective of this proposal is to provide service simultaneously and within the same radio channel to several users even if their data rate requirements are different. In addition, the bit error rate (BER) performance of our proposal is analyzed for four combining techniques and two network scenarios, one without multiple user interference (MUI) and one where the MUI reaches its maximum value. We consider a wide-band Rician fading channel with both independent and correlated frequency selectivity for the BER computations. The main the purpose of the paper is to show how the MUI and the correlation among subchannels affect the BER performance of a downlink MC-CDMA system. © 2006 IEEE.

Bit error rate; Code division multiple access; Computer networks; Error analysis; Fading (radio); Fading channels; Metropolitan area networks; Multicarrier modulation; Multitasking; Network architecture; Network protocols; Optical communication; Paper; Semiconductor counters; Turbo codes; Wireless local area networks (WLAN); Bit error rate (BER) performance; Combining techniques; Data rates; Downlink (DL); Frequency-selectivity; Infrastructure WLANs; International symposium; MC CDMA (code division multiple access); MC CDMA systems; Mobile radio communications; Multi-carrier code-division multiple access (MC-CDMA); Multiple-user interference (MAI); network scenarios; Radio channels; Rician fading channels; Sub-channels; Variable spreading factor (VSF); Wide bands; Wireless local area network (wireless LAN); Local area networks

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