MIMO-OFDM Channel Estimation with Minimum Differential Feedback for Time-Correlated Rayleigh Block-Fading Channels

	International Journal of P2P Network Trends and Technology (IJPTT)
	© 2014 by IJPTT Journal
	Volume - 4 Issue - 5
	Year of Publication : 2014
	Authors : Rasala Ashok , M. Shiva Prasad , M. Shashidhar

Citation

Rasala Ashok , M. Shiva Prasad , M. Shashidhar ."MIMO-OFDM Channel Estimation with Minimum Differential Feedback for Time-Correlated Rayleigh Block-Fading Channels". International Journal of P2P Network Trends and Technology (IJPTT), V4(5):17-21 Sep - Oct 2014, ISSN:2249-2615, www.ijpttjournal.org, Published by Seventh Sense Research Group.

Abstract

In Multi-Input Multi-Output (MIMO) based cognitive radio (CR) systems, with the increasing demand for data rate and reliability in Wireless communicationsand devices, several issues become very important like bandwidth efficiency, quality of service and radio coverage. We first derive the closed-form expression of the minimum differential feedback rate to achieve the maximum erdodic capacity in the presence of channel estimation errors and quantization distortion at the receiver. With the feedback-channel transmission rate constraint, in the periodic feedback system, we further investigate the relationship of the ergodic capacity and the differential feedback interval, First formulate the pilot design as a new optimization problem. Instead ofminimizing the mean-square error (MSE) of the least-squares (LS) channel estimator, we minimize an upper bound which isrelated to this MSE. We then propose an efficient scheme tosolve the optimization problem. This reliability is in the context of the channel estimationin our case. With the MIMO concept we improve the bitrate and BER of theoverall system.Simulation results show that thepilot index sequences obtained by the proposed method exhibitsignificantly better performance than those obtained by existing pilot design methods.

References

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Keywords
Channel state information, MIMO, pilot design, channel estimation, Rayleigh block-fading channels.