LTE modeling for low complexity Time Varying channels in MIMO-OFDM

U Himavarsha

Abstract


This MIMO-OFDM study is under the development of LTE (long term evolution).This technique also used in 4G (4th generation).If we considered this OFDM system using time-varying channel, the orthogonality among subcarrier is the considerable issue for ICI(inter-carrier interference).In existing methods number of channel models and different frame structures are developed to mitigate ICI but problem we faced is its computational complexity is very high. In this implementation we considered low complexity and ICI reduction method for MIMO-OFDM system using linear time varying channels. Complexity of the proposed work is reduced from to ), K=number of subcarriers, M and N are number of transmitters and receivers respectively. Time domain synchronous OFDM is suitable for proposed work because its advantage of easily estimation of linear time varying channels. We analyzed performance of proposed work using two different modulations, QPSK and 16 QAM.By proposed work execution results in MATLAB,we can show that  2dB SNR gain is achieved when the uncoded BER is  and the normalized Doppler frequency is 0.1.In this work we shown the comparative analysis of linear time varying (LTV) channel and linear time invariant (LTI) channel in MIMO-OFDM for given two modulations,QPSK and 16QAM and by changing the number of receiving antennas and Doppler frequency. For comparative analysis we used two objective parameters MSE and BER.The proposed work is extended to SUI modeling for LTI and LTV channels. We used SUI modeling parameters such as antenna diversity, antenna correlation, antenna power gain, etc.Finally, we showed that using SUI

 

modeling to normal channels (Rayleigh) we can get better performance compared to proposed work.         


Full Text:

PDF




Copyright (c) 2017 Edupedia Publications Pvt Ltd

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Publisher

EduPedia Publications Pvt Ltd, D-351, Prem Nagar-2, Suleman Nagar, Kirari, Nagloi, New Delhi PIN-Code 110086, India Through Phone Call us now: +919958037887 or +919557022047

All published Articles are Open Access at https://edupediapublications.org/journals/


Paper submission: editor@edupediapublications.com or edupediapublications@gmail.com

Editor-in-Chief       editor@edupediapublications.com

Mobile:                  +919557022047 & +919958037887

Websites   https://edupediapublications.org/journals/.

Journals Maintained and Hosted by

EduPedia Publications (P) Ltd in Association with Other Institutional Partners

http://edupediapublications.org/

Pen2Print and IJR are registered trademark of the Edupedia Publications Pvt Ltd.