Frequency offset compensation and equalization method and device in an orthogonal frequency division multiplexing system

摘要

A method is disclosed for frequency offset compensation and equalization in an orthogonal frequency division multiplexing system. The method comprises: acquiring a channel estimation value h and a frequency offset value f at a reference symbol; acquiring a Toeplitz matrix M(f) based on the frequency offset value f; performing phase compensation on the channel estimation value h to obtain a channel estimation value h′ at a data symbol; and acquiring an estimation value of a transmitted symbol x based on M(f) and h′. A device is also disclosed for frequency offset compensation and equalization in the orthogonal frequency division multiplexing system. The device comprises a channel estimation unit, a frequency offset acquisition unit, a channel compensation unit and an equalization estimation unit.

主权项

1. A method for frequency offset compensation and equalization in an orthogonal frequency division multiplexing system comprising:
acquiring a channel estimation value h and a frequency offset value f at a reference symbol; acquiring a Toeplitz matrix M(f) based on the frequency offset value f; performing phase compensation on the channel estimation value h to obtain a channel estimation value h′ at a data symbol; and acquiring an estimation value of a transmitted symbol x based on M(f) and h′; wherein M(f)=(ak,l),ak,l={{sin⁡(π⁢⁢γ)N⁢⁢sin⁡(π⁢⁢γN)}⁢exp⁡(j⁢⁢π⁢⁢γ⁢N-1N),when⁢⁢k=l{sin⁡(π⁢⁢γ)N⁢⁢sin⁡(π⁡(l-k+γ)N)}⁢exp⁡(-j⁢⁢π⁢l-kN)⁢exp⁡(j⁢⁢π⁢⁢γ⁢N-1N),when⁢⁢k≠l or when |k−l|>C, ak,l=0, C is a predetermined constant, and when |k−l|≦C,ak,l={{sin⁡(π⁢⁢γ)N⁢⁢sin⁡(π⁢⁢γN)}⁢exp⁡(j⁢⁢π⁢⁢γ⁢N-1N),when⁢⁢k=l{sin⁡(π⁢⁢γ)N⁢⁢sin⁡(π⁡(l-k+γ)N)}⁢exp⁡(-j⁢⁢π⁢l-kN)⁢exp⁡(j⁢⁢π⁢⁢γ⁢N-1N),when⁢⁢k≠l k and l are sub-carrier identifiers, a value range of which is 0 to m−1, m is the number of sub-carriers used by frequency offset estimation,γ=fF,F is an interval between the sub-carriers, N is the number of Fast Fourier Transform (FFT) points of one Orthogonal Frequency Division Multiplexing (OFDM) symbol.