Power Delay Profile Estimation for MIMO-OFDM Systems under LMMSE Channel Estimation Approach
Sriramula Poornima1, Lendale Praveen Kumar2
1Sriramula Poornima, M. Tech Student, Department of Electronics & Communication Engineering, Anurag Group of Institutions, Hyderabad, (A.P), India.
2Lendale Praveen Kumar, Assistant Professor, Department of Electronics & Communication Engineering, Anurag Group of Institutions, Hyderabad, (A.P), India.
Manuscript received on January 25, 2014. | Revised Manuscript received on February 13, 2014. | Manuscript published on February 28, 2014. | PP: 110-114 | Volume-3, Issue-3, February 2014. | Retrieval Number: C2594023314/2013©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: A multiple-input multiple-output (MIMO) communication system combined with the orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable high data rate transmission over broadband wireless channels. But the performance gain depends heavily on accurate channel estimation. In linear-minimum-mean-Squareerror(LMMSE) channel estimation for multicarrier system, one needs to know the channel statistics. We propose a power delay profile (PDP) estimation technique to obtain the frequency domain channel statistics at the receiver. The pilot symbols of all transmit antenna ports are used in estimating the PDP. The estimated PDP is used to generate the LMMSE filter Coefficients for data-subcarrier channel estimation. The distortions caused by null subcarriers and an insufficient number of samples for PDP estimation are also considered. The proposed technique effectively reduces the distortions for accurate PDP estimation. Simulation results show that the performance of LMMSE channel estimation using the proposed PDP estimate approaches that of Wiener filtering due to the mitigation of distortion effects.
Keywords: Channel estimation, PDP, MIMO, OFDM, LMMSE, 3GPP-LTE.