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3-antenna receive diversity is implemented within a smartphone form-factor to achieve gains in throughput (30% in median, 50% in the tail) and energy per bit over 2 antennas, with minimal increase to antenna volume even when supporting both low and high bands such as CELL (800 MHz) and PCS (1.9 GHz). Antenna designs are evaluated through simulations, and then integrated onto a smartphone prototype...
For an existing macro-cell wireless network deployment, it is shown how distributed antenna systems (DAS) can be added to improve the capacity. This is demonstrated through a set of experiments using a cdma2000 1xEV-DO outdoor test network on licensed spectrum with commercial reference devices and infrastructure equipment. DAS was used to add small cell sites at locations consistent with right-of-way...
Machine-to-machine (M2M) communications has recently become a growth area for wireless technologies. In this paper, we analyze the advantages of using CDMA2000 1x technologies for M2M communications and present a set of enhancements to its air interface that have been standardized in 3GPP2 (Rev F). Through simulation studies on real-world applications, we show that these enhancements can achieve significant...
Load Balancing is typically used in cellular wireless networks in the frequency domain to balance paging, access, and traffic load across the available bandwidth. In this paper we extend the concept of Load Balancing to the Spatial domain. We develop two approaches — Network Load Balancing and Single-Carrier MultiLink — for Spatial Load Balancing. While these techniques are applicable to both cellular...
We pose a network-wide scheduling problem for cellular wireless networks in which users are capable of being served by several schedulers on the downlink, though not jointly. We present a distributed algorithm, with limited communication across servers, that solves this problem optimally, in that it gives the network-wide proportional fair solution. An idealized version is presented first, in which...
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