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Channel estimation method of OFDM/OQAM system

A channel estimation and coefficient technology, applied in the field of OFDM communication, can solve the problem of poor system bit error rate performance

Inactive Publication Date: 2011-01-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional channel estimation method in the OFDM / OQAM system causes the poor performance of the system bit error rate, and proposes a channel estimation method for the OFDM / OQAM system

Method used

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  • Channel estimation method of OFDM/OQAM system
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  • Channel estimation method of OFDM/OQAM system

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Embodiment Construction

[0021] Specific embodiments of the present invention will be given below in conjunction with the accompanying drawings. It should be noted that the parameters in the examples do not affect the generality of the present invention.

[0022] Before setting forth the specific implementation, first introduce the terms used therein:

[0023] 1) OQAM modulation is the real part, imaginary part symbols and the phase factor e j(m+2n) 、e j(m+2n+1) Multiply, let the real and imaginary parts stagger a time slot, and keep the two orthogonal.

[0024] 2) OQAM demodulation is the phase factor e of the two signals before OQAM demodulation j(m-2n) 、e -j(m+2n) Multiply to keep the real and imaginary part signals before ZF in the same time slot.

[0025] 3) The time-frequency grid point is that the x-axis represents the time domain, and the y-axis represents the coordinates of a point on the plane formed by the frequency.

[0026] 4) IFFT is the inverse Fourier transform of the frequency sig...

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Abstract

The invention discloses a channel estimation method of an OFDM / OQAM system, which solves the problem of the poor error rate performance of the system caused by the fact that the traditional channel estimation method of the OFDM / OQAM system only uses a line of 0 to protect a Preamble symbol. In the receiving process, the channel estimation process comprises the steps of ZF(191), ZF(192), CE(18) and PIC(22). Based on the prefix interference cancellation method, the invention eliminates the interference of channel estimation coefficients, acquires more accurate channel estimation coefficients and improves the error rate performance of the OFDM / OQAM system.

Description

technical field [0001] The invention belongs to the technical field of OFDM communication, in particular to a channel estimation method of an OFDM / OQAM system. Background technique [0002] Among the existing communication technologies, OFDM / OQAM (Orthogonal Frequency Division Multiplexing with Offset Quadrature Amplitude Modulation) has become one of the main candidate technologies for future mobile multimedia communication due to its high spectrum utilization rate and good anti-multipath fading performance. . [0003] The traditional channel estimation method of the OFDM / OQAM system uses a series of 0-protected Preamble symbols to estimate the channel coefficients. The specific working principle is as follows figure 1 As shown, the transmission process: 3 frames of source data are modulated by QAM 1 to obtain three frames of modulation symbols a m，n ,Such as image 3 A frame of Preamble symbol b is shown m，n with triple frame modulation symbol a m，n The synthesized fo...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02H04L27/26H04L27/34
Inventor 何旭邓飞肖悦李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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