Carl R. Nassar

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This paper introduces the principles of interferometry to multicarrier code division multiple access (MC-CDMA). Specifically, we propose the use of MC-CDMA with novel carrier interferometry (CI) complex spreading codes. The CI/MC-CDMA method, applied to mobile wireless communication systems, offers enhanced performance and flexibility relative to MC-CDMA(More)
In this letter, a procedure for generating Rayleigh fading envelopes with any desired covariance matrix is given. This method, numerical in nature, enables researchers to simulate correlated fading envelopes, for use in: 1) the study of the impact of correlation on diversity system performance and 2) the study of multicarrier CDMA (MC-CDMA), where the(More)
In this letter, a large set of spreading codes that doubles capacity in multicarrier code-division multiple-access (MC-CDMA) systems without any cost in bandwidth and with negligible cost in performance is introduced. This large set is comprised of: 1) complex spreading codes instead of conventional real-valued spreading codes and 2) two sets, each made up(More)
In this article we propose a new multicarrier platform to optimize the efficiency of wireless operators’ licensed hands and enable flexible sharing of licensed and unlicensed hands (in different spectral regions). This research, besides introducing a high degree of flexibility of spectrum use for 4G systems, supports a recent FCC proposal that goes beyond(More)