Arvind Chakrapani

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In this paper, we consider wireless communication systems where user equipments (UEs) monitor packet-data traffic characteristics and adopt Discontinuous Reception (DRX) to conserve battery power. With DRX, the receiver circuitry is configured to toggle between on (active) and off (inactive) states for specified durations, depending on the packet arrival(More)
Geographic random forwarding (GeRaF) is a location based distributed routing protocol that allows wireless networks with aggressive sleep cycles of its nodes to deliver messages with low latency. Hybrid-Automatic Repeat Request (H-ARQ) based intra-cluster geographically informed relaying (HARBINGER) is a protocol based on GeRaF with link-layer based(More)
In relay assisted wireless communications, the multi-source, single relay and single destination system (an M 1-1 system) is of growing importance, due to the increased demand for higher network throughput and connectivity. Previously, power allocation in M -1-1 systems have assumed availability of instantaneous channel state information (CSI), which is(More)
This paper proposes two low complexity methods in time domain for limiting Peak to Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems by employing cyclically shifted sequences with different delay and phase factors. Since the proposed method operates in time domain it requires only two Fast Fourier Transform (FFT)(More)
Next generation cellular networks (5G) have to deal with deployment of massive machine-type-communication (MTC) devices as the internet of things (IoT) becomes pervasive. To cater to such demand, 3GPP has finalized specifications for enhanced machine type communication (eMTC) and narrowband IoT (NB-IoT) as part of LTE Release 13<sup>1</sup>. To avoid(More)
This paper briefs about the Partial Transmit Sequences for Peak-to-Average Power Ratio Reduction of OFDM Signals, PAPR reduction efficiency of this method in comparison with Companding and Clipping and some merits and demerits of using various methods of PAPR reduction. Based on the above survey the criteria for the selection of PAPR reduction is given and(More)
In this paper, we propose a new energy efficient Location Error Aware Routing (LEAR) protocol, which takes into account the location error being experienced by the forwarding relay. The majority of geographically informed routing algorithms assume access to accurate location information. However, in practical systems location measurements are prone to(More)