Abstract:

A restructuring method for least square (LS) channel est ation using cyclic-prefix frequency sequences (CPFS) in orthogonal frequency division multiplexing (OFDM) system was proposed. The restructuring method was based on the relationship of CPFS and comb-pilots which made a higher LS channel estimation precision. Specifically, the relationship used a convex optimization model, the model was set up using total sub carriers as variable and mi-nimized mean square error (MSE) as the principle to generate constraint, where further the optimized restructuring result using Lagrange method was derived. Simulations verify that under the restructured total sub carriers CPFS can enhance the LS channel estimation precision.

Key words: orthogonal frequency division multiplexing, channel estimation, cyclic-prefix frequency sequences, convex optimization, Lagrange method, comb sub-carriers sequences