S. Suganya ¹, C. Ramesh ¹

Affiliations
1 Department of Electronics and Communication, C.M.R. Institute of Technology, Bangalore - 560037, Karnataka, IN

Abstract

In this work, a method is proposed to schedule the resources while considering SNR values along with CQI in a view to provide a better packet scheduling. A threshold based method is also proposed with multiple packet scheduling algorithm. A novel Kalman filter based CQI estimation algorithm is designed using SNR values. Different packet scheduling algorithms are decided for varied CQI levels. Simulation results show that the proposed method would improve the link level performance and average throughput of the system. Furthermore, the effect of improving quality is highlighted on user experience and applications are suggested which might change the way we will use Internet in near or far future.

Keywords

Channel Allocation, Fair Queuing, Imperfect CQI, LTE, Packet Scheduling, Proportional Fair, Resource Blocks.

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K. P. Sharmila ¹, C. Ramesh ¹

Affiliations
1 Department of Telecommunication Engineering, CMR Institute of Technology, Bangalore – 560037, IN

Abstract

Increasing demands for highly efficient proximity networks led to the derivation of LTE-A (LTE-Advanced) by 3GPP (3rd-Generation- Partnership-Project).Its superior characteristics in terms of capacity and data rates make it a user-friendly option to realize the pipe dream of efficient communication for several communication modules. Device to Device (D2D) communication is one such scheme that adopted the features of LTE-A to ensure the quality of experience and services for the users. D2D aims at establishing device connectivity by interlinking devices in the vicinity. Direct connectivity and connectivity via ENodeB (eNB) are the advisable schemes of D2D Communication. Further enhancement is D2D is realized in the form of side-link which ensures direct connectivity of devices by eliminating eNB routing. This achievement by 3GPP enhances the co-existence of side-link and D2D,which makes it adoptable in various value added services. One such value added service exists as VANETS (Vehicular ad-hoc networks), designed for inter vehicular communication to elevate quality of living of the people by ensuring public safety. This paper mainly focuses on Radio Resource Controller (RRC), Media Access Control (MAC) and ProSe layers of 3GPP protocol stack.

Keywords

D2D, LTE-A, Proximity Services, Side-Link, VANET

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M. Pappa ¹, C. Ramesh ¹

Affiliations
1 Department of Electronics and Communication, CMR Institute of Technology, Bangalore - 560 037, IN

Abstract

Multiple-input multiple-output (MIMO) Orthogonal frequency division multiplexing (OFDM) technology is becoming mature in wireless communication systems. It has led to the third and fourth generation wireless systems which have been providing good range, reliability and higher data rates. To extract the benefits provided by the MIMO systems, it is necessary to estimate the noisy channel through which the information is transmitted. To acquire the channel parameters, we propose compressed sensing (CS) method based on priority which considers the channel with few dominant taps, i.e., sparse nature of the channel is exploited. In this method, priority is taken into consideration, where all user equipments (UE) are not of equivalent significance and more inclination is given to the user with high need. When the number of UEs is more than the available channels, rating is given to UEs based on some heuristics. With this proposed method, we can obtain better performance in-terms of BER and SNR when compared to the conventional methods such as least square (LS) and minimum mean square error (MMSE) techniques. Simulation results show the comparison between the proposed method and the conventional method which proves that the compressed sensing technique outperforms the LS and MMSE techniques.

Keywords

Channel Estimation, Compressed Sensing, MIMO-OFDM, MMSE, LS, UE

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