Wireless propagation channel modeling for optimized handoff algorithms in wireless LANs

Abstract

We present, firstly, a simple time-series analysis techniques which cover the basic concepts and mechanisms driving the wireless propagation channel. We also use a generated series for simulation study of Handoff performance showing the impact of multipath phenomena. The extraction of the overage signal (slow variations) from the fast variations was done. This overall signal has been used to reduce significantly the number of unnecessary handoffs. To better minimize the power consumption, that the wireless propagation channel requires, our proposed approach was verified at the algorithmic level using Matlab 7.6 tool, described in Very-high-speed integrated circuit Hardware Description Language (VHDL) at the register transfer level (RTL) and it has been synthesized using ISE 10.1 of the field-programmable gate array (FPGA) environment xilinx virtex V that evaluates the circuit in terms of speed, area and power consumption. The wireless propagation channel modeling is based on the linear model concept of the received power from the access point (AP). This concept has a crucial role in modeling new decentralized handoff based on the ratio of expected and current signal slopes already provided by the linear model. Hence, a fuzzy-based solution is developed and a comparison with the analytical solution results is established.