Wireless Communication

S. Yamini ¹, K. Kavitha ¹

Affiliations
1 K. L. N. College of Engineering, Madurai, Tamilnadu, IN

Abstract

In MIMO-OFDM systems the Inter Block Interference(IBI) is the main issue during the signal travels from source to destination. Hence it disrupts the accurate flow of the signal when the number of receive antennas is less than that of the number of transmit antennas. To eliminate such type of interference many schemes like addition of cyclic prefix or zero padding or increase the equal number of receive antennas.In this paper the Tomlinson-Harashima precoding (THP) procedure is proposed to null the Inter Block Interference(IBI) in the MIMO-OFDM system of  transmits antennas (nt) and  receive  antennas (nr) with insufficient cyclic prefix(CP) . The proposed scheme can eliminate the IBI with higher bandwidth efficiency in the case receive antenna is not more than the transmit antenna (nr ≤nt). Experimental results are presented to illustrate the performance of the proposed method, demonstrating clearly superior performance of  the  new  technique when receive antenna is not more than that of the transmit antenna.

Keywords

MIMO-OFDM, Precoding, Interference Block Interference, Tomlinson-Harashima Precoder (THP), Insufficient Cyclic Prefix (CP).

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K. Kavitha ¹, K. Selvakumar ¹, P. Gokila ¹

Affiliations
1 Department of CSE, Annamalai University, IN

Abstract

The Mobile Ad-Hoc Networks (MANETs) are wireless networks where a collection of mobile nodes may dynamically vary the topological structure. The design of efficient routing protocols is a fundamental problem in MANETs. Stability-based routing and Power-aware routing protocols are simulated. In this paper the Flow-Oriented Routing Protocol (FORP), Min-Max Battery Cost Routing (MMBCR) as representatives of the Stability-based routing and Power-aware routing respectively. FORP incurs the least number of route transitions, its tends to repeatedly use nodes lying on the stable path. MMBCR is most fair in terms of node usage and minimum energy consumed by per data packet whereas FORP incurs maximum energy consumed by per data packet. FORP gives higher values of packet delivery fraction. A high value of PDF indicates that most of the packets are being delivered to the higher layers and is a good indicator of the protocol performance. MMBCR make minimum use of power control by conserving the battery charge at the nodes while transferring data packets. Compared to that of the FORP, MMBCR have the smallest hop count and lowest end-to-end delay per data packet. The simulation of these protocols has been carried out by using NS-2 simulator. Five different simulation scenarios are generated and maximum node speed has been varied and other network parameters are kept constant during the simulation. The main objective of this paper is to implement the FORP and MMBCR and compare the performance metrics of route transitions, end-to-end delay, energy and packet delivery fraction.

Keywords

AODV Protocol, DSR Protocol, FORP, MMBCR, and Wireless Network.

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