Design of Low Power and High Speed Correlators for IEEE 802.16 WiMAX Systems

B Sivasankari,P Poongodi

doi:10.4236/cs.2016.78118

Abstract

The advanced communication system uses wireless broadband access technologies which provide high speed data connectivity to the subscribers. One of the most popular wireless access technology is Worldwide Interoperability for Microwave Access (WiMAX) and it is based on IEEE 802.16 standard. WiMAX used Orthogonal Frequency Division Multiplexing (OFDM) is an effective modulation technique to improve the timing synchronization. The performance of channel is affected due to the synchronization mismatching between the transmitter and receiver ends. To achieve the timing synchronization in IEEE 802.16 systems, the cross correlator is used to synchronize the received signal with the known signal. In this paper, two high speed correlators are proposed based on Q1.15 format, which is used to validate the timing synchronization problem. The proposed work has been mapped on XC6VCX75T FPGA and simulations are carried out on the Xilinx-ISIM platform. The implementation result shows that the power delay product reduction is 40.81%, and delay reduction is 39.59% over the conventional multiplier less correlators.

Highlights

Nowadays, wireless technology is part of everyone’s life
The multiplier less correlator is designed to process the complex coefficients as a sum of power of two and the correlator round off the appropriate coefficients
The behavioral simulation was done in ISIM simulator

Summary

Introduction

Wireless technology is part of everyone’s life. In every consumable from phones to computer, internet, Broadband Wireless Access (BWA) is most popularly used without the use of cable modems and Digital Subscriber Line (DSL) connections. The signals are transmitted through radio waves. It is possible for long range of communications, which is not possible with the use of wires. One of the wireless techniques is a Metropolitan Area Network (MAN) which is based on IEEE 802.16 standard. The correlators were designed to overcome this synchronization problem. It is a standard method to estimate the degree to which the two series of signals are correlated. It is mainly used for determining the timing delay between two signals

Methods

Results

Conclusion