Project summary

Ah-Hoc networks are a new way of wireless communication. They do not need without any type of infrastructure. There are different standards to establish an ad-hoc communication such as IEEE 802.11a/g/p. These standards base their physical layer (PHY) in an OFDM transmission due to their great advantages. However, OFDM signals occasionally present high power peaks compared with the average power (this is the well-known problem of the PAPR (Peak-to-Average Power Ratio)), which can cause degradation of the system's performance of ad-hoc communication.

One way to measure performance of a PHY is through the PER (Package Error Rate), which determines the rate of packets that have been received with errors. There are different analytical and empirical equations to calculate the PER which including parameters such as: the number of lost packets, end to end transmission delay , the number of hops, packet retransmissions among others. However, none of these formulations have considered the gain or loss in PER that PAPR reduction technique generates. This project aims to model a new equation for the calculation of PER including aspects of the PAPR to improve the realism of the ad hoc networks simulators.

To achieve the objective of this project, we will follow the next steps: (1) analysis and simulation of the PHY of the 802.11 amendments that use OFDM for ad-hoc networks, (2) analysis, simulation and performance comparison of the OPS-SAP technique (Simple Amplitude Predistortion aided by Orthogonal Pilot Sequences) for the reduction of PAPR in IEEE 802.11, (3) analysis of existing literature of PER formulations, (4) formulation of a a new equation for the calculation of PER including aspects of PAPR, (5) Performance evaluation of the new equation of PER with PAPR effect(6) to implement the new equation in a network simulator to improve the level of realism of the ad hoc networks simulators.