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Receiving end equilibrium method and system based on frequency domain communication channel estimation

A technology of frequency domain channel and equalization method, which is applied in baseband system, channel estimation, multi-frequency code system, etc., can solve the problem of signal rate overhead, etc., and achieve the effect of simple channel estimation, saving calculation time, and low complexity

Active Publication Date: 2013-10-02
PEKING UNIV
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Problems solved by technology

However, this algorithm needs to insert a cyclic prefix / suffix to the signal, which will cause a certain signal rate overhead

Method used

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  • Receiving end equilibrium method and system based on frequency domain communication channel estimation
  • Receiving end equilibrium method and system based on frequency domain communication channel estimation
  • Receiving end equilibrium method and system based on frequency domain communication channel estimation

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Embodiment Construction

[0040] Hereinafter, the present invention will be further described in detail through specific embodiments and drawings.

[0041] In the present invention, the relationship between the transmitted signal and the received signal is as follows:

[0042] C ( k ) = 1 H ~ ( k ) = S tr ( k ) R tr ( k ) → IDFT s tr ( n ) = r tr ( n ) * c ( l ) ,

[0043] Where s tr (n) is the transmitted training sequence, r tr (n) is the received training sequence, their corresponding frequency domain form is S tr (k) and R tr (k); C(k) is the tap of the frequency domain equalizer, Is the channel transfer function estimated at the receiving end, and c(l) is the tap coefficient of the time-domain finite impulse response (FIR) filter.

[0044] The following is combined with the algorithm flow of this embodiment figure 1 Give specific instructions on the implementation of the technical plan...

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Abstract

The invention relates to a receiving end equilibrium method and system based on frequency domain communication channel estimation. The method comprises the following steps: training sequences with flat spectrum characteristics are inserted into signals at the transmitting terminal, the received training sequences are transformed into the frequency domain at the receiving end through fast Fourier transformation, the transfer function of a communication channel is obtained through dividing the ideal spectrum corresponding to the frequency domain, and then the reciprocal of the transfer function is taken and is transformed into the time domain through the fast Fourier transformation so as to obtain time domain filter tapping coefficient; thereafter, filtering is performed to data signals in the time domain through utilizing the time domain filter tapping coefficient, so that signaling equilibrium is realized. The system includes various modules realizing the corresponding functions. The method and the system combine characteristic of avoidance in cost caused by inserting cyclic prefix / suffix of time domain equilibrium and the characteristic of simple communication channel estimation of the frequency domain equilibrium; on the condition that the optical fiber dispersion is smaller or the dispersion is compensated by other arithmetic, the phase noise compensation is efficiently performed; the arithmetic complexity is small; the calculation time can be saved.

Description

Technical field [0001] The present invention relates to the field of coherent optical communication transmission, and relates to a receiving end equalization method based on frequency domain channel estimation, and a system for implementing the method. Background technique [0002] Coherent communication based on digital signal processing technology is an important solution for long-distance optical fiber communication transmission systems. How to overcome the communication channel damage is an important issue to be solved. The damage of the communication channel reduces the signal-to-noise ratio of the signal and introduces inter-symbol interference, which leads to the generation of bit errors. In the optical fiber communication system, the equalization algorithm estimates the channel and compensates the linear distortion of the channel to reduce or eliminate inter-symbol interference. [0003] At present, there are two main types of equalization algorithms, one is time domain e...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/26
CPCH04L25/0212H04L25/022H04L2025/03414
Inventor 张帆郑桢楠陈章渊
Owner PEKING UNIV
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