A spread-spectrum multi-carrier multiple-access system for mobile communications
Multi-carrier spread-spectrum
OFDM for Wireless Multimedia Communications
OFDM for Wireless Multimedia Communications
Lagrange/Vandermonde MUI eliminating user codes forquasi-synchronous CDMA in unknown multipath
IEEE Transactions on Signal Processing
IEEE Transactions on Signal Processing
Complex-field coding for OFDM over fading wireless channels
IEEE Transactions on Information Theory
Maximum-diversity transmissions over doubly selective wireless channels
IEEE Transactions on Information Theory
Orthogonal multiple access over time- and frequency-selective channels
IEEE Transactions on Information Theory
IEEE Communications Magazine
Wireless bandwidth in the making
IEEE Communications Magazine
Performance Tradeoff in Multiuser Equalization for CDMA over Flat Channels
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
IEEE Transactions on Communications
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Relying on block-symbol spreading and judicious design of user codes, this paper builds on the generalized multicarrier (GMC) quasisynchronous CDMA system that is capable of multiuser interference (MUI) elimination and intersymbol interference (ISI) suppression with guaranteed symbol recovery, regardless of the wireless frequency-selective channels. GMC-CDMA affords an all-digital unifying framework, which encompasses single-carrier and several multicarrier (MC) CDMA systems. Besides the unifying framework, it is shown that GMC-CDMA offers flexibility both in full load (maximum number of users allowed by the available bandwidth) and in reduced load settings. A novel blind channel estimation algorithm is also derived. Analytical evaluation and simulations illustrate the superior error performance and flexibility of uncoded GMC-CDMA over competing MC-CDMA alternatives especially in the presence of uplink multipath channels.