Naveen Arulselvan

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—Femtocells are low-cost, miniature base-stations intended to improve indoor coverage in 3G networks and beyond. One of the main issues in adopting femtocells en masse is the surge in interference to the mobile users served by the macrocell arising from unplanned networks and private access. Therefore, distributed power control mechanisms for femtocells are(More)
We consider energy-efficient resource allocation for wireless fading channels. We study the case where a sliding window ARQ protocol such as Go-Back-N is used to provide reliable communication. In particular, we consider power allocation policies that take into account the underlying window dynamics. An optimal dynamic programming approach and a sub-optimal(More)
In this paper, we develop a novel inter-cell interference co-ordination scheme that takes into account the interference cost on neighboring cells. We formulate a multi-cell utility maximization problem and subsequently decouple it into single-cell optimization problems by including an interference penalty. By solving this decoupled problem, we derive(More)
The need for Inter-cell Interference Coordination (ICIC) schemes in LTE heterogeneous networks, is well elucidated in literature [1]. We consider distributed scheduling mechanisms so that multiple base-station vendors can co-exist. Moreover, in legacy LTE networks, fast timescale coordination across base-stations may not be possible due to the inherent(More)
—We study several channel quality reporting strategies for OFDMA systems that maximize the sum-rate while constrained by feedback and signaling overhead. These reporting schemes are based on the grouping idea, which essentially limits the number of users accessing a sub-channel or physical resource block. This in turn reduces the overhead needed to convey(More)
In this work we design retransmission schemes for broadcast networks using simple network coding techniques. In particular we study a wireless system with limited uplink feedback which can either be shared among all users or be partitioned for dedicated usage. In the shared feedback model the number of transmission errors is estimated using a voice-vote(More)
We consider scheduling problems for downlink data transmission in wireless networks. There are multiple users in the system and each user is assigned a utility function that depends on queue length at the base station. Due to the burst error nature of the wireless channel, re-transmissions sometimes are necessary for providing reliable communications. Here(More)