《Frequency Domain Equalization for Single-Carrier Broadband Wireless Systems》.pdf

WIDEBAND WIRELESS ACCESS TECHNOLOGIES TO BROADBAND INTERNET Frequency Domain Equalization for Single-Carrier Broadband Wireless Systems David Falconer, Carleton University Sirikiat Lek Ariyavisitakul, Radia Communications Anader Benyamin-Seeyar, Harris Corp. Brian Eidson, Conexant Systems, Inc. ABSTRACT such environments multipath can be severe. This raises the question of what types of anti-multi- Broadband wireless access systems deployed path measures are necessary, and consistent with in residential and business environments are low-cost solutions. Several variations of orthogo- likely to face hostile radio propagation environ- nal frequency-division multiplexing (OFDM) ments, with multipath delay spread extending have been proposed as effective anti-multipath over tens or hundreds of bit intervals. Orthogo- techniques, primarily because of the favorable nal frequency-division multiplex (OFDM) is a trade-off they offer between performance in recognized multicarrier solution to combat the severe multipath and signal processing complexi- effects of such multipath conditions. This article ty [1]. surveys frequency domain equalization (FDE) This article discusses an alternative approach applied to single-carrier (SC) modulation solu- based on more traditional single-carrier (SC) tions. SC radio modems with frequency domain modulation methods. We show that when com-