Marco Hernandez | Universidad Nacional Mayor de San Marcos (original) (raw)
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Papers by Marco Hernandez
Multipath fading and multiple access interference (MAI) are the major constraints on the performa... more Multipath fading and multiple access interference (MAI) are the major constraints on the performance of DS/CDMA systems. Antenna arrays and multiuser detectors have been considered to increase the system capacity through mitigation of such impairments. Multiuser detectors have the capability of eliminating MAI, the near-far problem and providing a significant capacity increase. In order to gain from the enhancements of both: multi-user detection and adaptive antenna, we propose in this paper to combine both schemes for an asynchronous WCDMA system. The performance of the combined scheme is evaluated for the uplink over the Gaussian channel and the UMTS frequency selective Rayleigh fading channel. We make a comparison of the most promising multiuser structures and the recursive least square algorithm to control the beamformer
IEEE Transactions on Geoscience and Remote Sensing, 1998
Abstract We consider the initial timing acquisition for asynchronous DS-UWB transmissions in a d... more Abstract We consider the initial timing acquisition for asynchronous DS-UWB transmissions in a distributed network topology, ie, no com-mon timing reference and neither synchronization among terminals are provided. Thus, when an arbitrary terminal in active mode (at ...
Multipath fading and multiple access interference (MAI) are the major constraints on the performa... more Multipath fading and multiple access interference (MAI) are the major constraints on the performance of DS/CDMA systems. Antenna arrays and multiuser detectors have been considered to increase the system capacity through mitigation of such impairments. Multiuser detectors have the capability of eliminating MAI, the near-far problem and providing a significant capacity increase. In order to gain from the enhancements of both: multi-user detection and adaptive antenna, we propose in this paper to combine both schemes for an asynchronous WCDMA system. The performance of the combined scheme is evaluated for the uplink over the Gaussian channel and the UMTS frequency selective Rayleigh fading channel. We make a comparison of the most promising multiuser structures and the recursive least square algorithm to control the beamformer
IEEE Transactions on Geoscience and Remote Sensing, 1998
Abstract We consider the initial timing acquisition for asynchronous DS-UWB transmissions in a d... more Abstract We consider the initial timing acquisition for asynchronous DS-UWB transmissions in a distributed network topology, ie, no com-mon timing reference and neither synchronization among terminals are provided. Thus, when an arbitrary terminal in active mode (at ...