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| Channel Estimation Based on a New Pilot Forwarding Schedule for Distributed Space-Frequency Coded Cooperative Communication System |
| Yu Xiao-fan; Zhao Chun-ming |
| National Mobile Communication Research Lab, Southeast University, Nanjing 210096, China |
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Abstract Several frequency-domain channel estimation algorithms based on a new pilot forwarding schedule are proposed for distributed space-frequency coded cooperative communication system with multiple relay nodes over frequency-selective fading channels, including the Least Square (LS) method and the Low rank Linear Minimum Mean Square Error (Lr-LMMSE) method. The cooperative relay nodes forward the pilot vector sent by the source node to the destination in different time slots, so that the superposition of the pilot signals transmitted by different relay nodes is avoided. Theoretical analysis showes that the proposed algorithms achieve all the frequency-domain channel fading coefficients of the multi-relay distributed SF coded cooperative communication system successfully. Simulation results confirme the performance of the proposed channel estimation algorithms, including the high accuracy, extraordinary practicality and the low complexity.
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Received: 23 June 2009
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Corresponding Authors:
Yu Xiao-fan
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2010, Vol. 32 
