Design and Implementation of an Integrated Beamformer and Uplink Scheduler for OFDMA Femtocells

Provided by: Association for Computing Machinery
Topic: Mobility
Format: PDF
Beamforming is a signal processing technique with numerous benefits. Unlike with omni-directional communications, it focuses the energy of the transmitted and/or the received signal in a particular direction. Although beamforming has been extensively studied on conventional systems such as WiFi, little is known about its practical impact on OFDMA femtocell deployments. Since OFDMA schedules multiple clients (users) in the same frame (in contrast to WiFi), designing intelligent scheduling mechanisms and at the same time leveraging beamforming, is a challenging task. Unlike downlink, the authors show that the integration of beamforming with uplink scheduling projects an interesting trade-off between beamforming gain on the one hand, and the power pooling gain resulting from joint multi-user scheduling on the other hand.

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