Comparison of Combined Multi-rate Barker Codes and Multi-rate Barker Codes For WOFDM Systems

International Journal of Electronics and Communication Engineering

© 2014 by SSRG - IJECE Journal

Volume 1 Issue 10

Year of Publication : 2014

Authors : Radwa K. Hamad , Ehab F. Badran, Amira I. Zaki and Said E. El-Khamy

10.14445/23488549/IJECE-V1I10P103

How to Cite?

Radwa K. Hamad , Ehab F. Badran, Amira I. Zaki and Said E. El-Khamy, "Comparison of Combined Multi-rate Barker Codes and Multi-rate Barker Codes For WOFDM Systems," SSRG International Journal of Electronics and Communication Engineering, vol. 1,  no. 10, pp. 7-14, 2014. Crossref, https://doi.org/10.14445/23488549/IJECE-V1I10P103

Abstract:

In this paper channel estimation is achieved through the use of two novel algorithms involving Barker codes. Comparisons between the delay estimation percentage error of the Least Linear Minimum Mean Square Error (LMMSE) conventional channel estimation technique with the two newly proposed techniques takes place. The first proposed algorithm embeds a Barker code to the transmitted wavelet orthogonal frequency division multiplexing (WOFDM) data block and uses the correlation between that Barker code and the received signal in order to accurately estimate the channel delay at the receiving end. Two new ideas were investigated in an attempt to generate multirate versions of the Barker code of length 13. For the first investigated technique combined Barker codes were generated where a barker code. For the second investigated technique each bit of the initial Barker 13 code was repeated a varying number of times in order to generate mutli-rate versions of the code. Those multi-rate Barker codes generated using the second technique were used in creating a training sequence and using the difference in peak positions of the auto correlation of the transmitted and received sequences the delay introduced by the channel was estimated. These comparisons were performed with the four most common wavelet filters used in the WOFDM modulation. The simulation and results show the advantages of the two new proposed techniques.

Keywords:

Barker codes, channel estimation, correlation, LMMSE, Multi-rate codes

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