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Data traffic demand in cellular networks today is increasing at an exponential rate. As the link efficiency is approaching its fundamental limits, further improvements in system spectral efficiency are only possible by increasing the node deployment density. In a relatively sparse deployment of macro base stations, adding another base station does not(More)
In this paper we assess how coordination among base stations can be exploited to improve downlink capacity in fourth generation (4G) cellular networks. We focus on heterogeneous networks where low-power pico cells are deployed within the coverage area of an existing macro network with the aim of offloading traffic from the (potentially congested) macro(More)
Wireless communications of the next generation rely on large bandwidths and orthogonal frequency division multiple access (OFDMA) techniques to achieve high data rates. In a OFDMA-based wireless wide area network (WWAN), e.g., a cellular network, interference management and handoff are keys to the system performance, such as capacity, coverage, and(More)
In this paper modified ARQ (automaticrepeat-request) techniques based on turbo coding are investigated for asynchronous DS-CDMA (directsequence code-division multiple-access) data networks under shadowing and frequency selective fading channel conditions. The throughput, delay, and energy efficiency performance of standard ARQ, metric combining, and RCPT(More)