Phase noise elimination method in orthogonal frequency division multiplexing system

A phase noise and orthogonal frequency division technology, applied in multi-frequency code systems and other directions, can solve the problem of not considering channel estimation, restricting the application range, and high algorithm complexity, reducing the number of estimated parameters and achieving the effect of noise elimination.

Inactive Publication Date: 2011-07-20
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0007] 3. Literature (Phase Noise Estimation and Mitigation for OFDM Systems, IEEE Transactions on Wireless Communications, vol.5, no.12, pp.3616-3625, 2006 .) A phase noise elimination algorithm based on LMMSE (Linear Minimum Mean Square Error) and ML (Maximum Likelihood, Maximum Likelihood) criteria is given, but the complexity of the algorithm is high and channel estimation is not considered. Its scope of application

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  • Phase noise elimination method in orthogonal frequency division multiplexing system
  • Phase noise elimination method in orthogonal frequency division multiplexing system
  • Phase noise elimination method in orthogonal frequency division multiplexing system

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[0027] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0028] The OFDM system model realized by the following embodiments is as follows: for 0≤tk Represents the source symbols after constellation mapping and S / P conversion, N represents the number of subcarriers in the OFDM system, T represents the OFDM symbol period, n(t) represents the additive white Gaussian noise (Additive White Gaussian Noise, AWGN), h (t) represents the channel impulse response (Channel Impulse Response, CIR), φ TX (t) and φRX (t) represents the phase noise at both ends of the transceiver, respectively. Since this algorithm does not involve a cyclic prefix (Cycle Prefix, CP), it will not be ...

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Abstract

The invention discloses a phase noise elimination method in an orthogonal frequency division multiplexing system in the technical field of wireless communication. The method comprises the following steps of: obtaining a channel transfer function (CTF) matrix through a pretreatment matrix and a channel estimation shock response vector so as to reduce the number of channel estimation parameters from the number of sub-carriers to the number of channel time domain lengths; reducing the number of phase noise estimation parameters through a down sampling matrix; estimating CTF matrix and a phase noise matrix in a pilot frequency time slot through an iterative method to obtain an optimal estimated value of the CTF matrix, namely continuously tracking and estimating to obtain the phase noise estimated value by utilizing the optimal estimated value under the condition that the channel is invariable in adjacent pilot frequency time slots; and compensating a received signal by utilizing the phase noise estimated value so as to eliminate the noise.

Description

technical field [0001] The invention relates to a method in the technical field of wireless communication, in particular to a method for eliminating phase noise in an orthogonal frequency division multiplexing system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology has the characteristics of high spectral efficiency, anti-narrowband interference, and easy implementation using the existing FFT (Fast Fourier Transform, Fast Fourier Transform), and has become a broadband wireless mobile communication system One of the key technologies, it has been widely used in broadband wireless metropolitan area network (IEEE802.16), DAB (Digital Audio Broadcasting, digital audio broadcasting system), DVB-T (Digital Video Broadcasting-terrestrial, terrestrial digital video broadcasting system), etc. wireless communication system. OFDM technology is also used as one of the future 4G core technologies to me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 杜文何晨占敖蒋铃鸽
Owner SHANGHAI JIAO TONG UNIV
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