Unlock instant, AI-driven research and patent intelligence for your innovation.

Apparatus and method for processing a digital signal in a frequency domain linear equalizer

A digital signal and equalization device technology, applied in digital transmission systems, electromagnetic receivers, radio transmission systems, etc., can solve problems such as increasing loop delay, and achieve the effects of reducing processing load, high flexibility, and reducing complexity

Active Publication Date: 2018-11-23
HUAWEI TECH CO LTD
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, larger FFTs increase loop delay due to increased block size and pipeline depth
Existing techniques do not provide the required flexibility for cases where the input oversampling rate is not constant

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Apparatus and method for processing a digital signal in a frequency domain linear equalizer
  • Apparatus and method for processing a digital signal in a frequency domain linear equalizer
  • Apparatus and method for processing a digital signal in a frequency domain linear equalizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063] In the following embodiments, a frequency-domain MIMO equalizer for a coherent optical receiver is described.

[0064] In particular, embodiments enable a significant reduction in complexity by reducing the FFT size and discarding useless frequency components. Additionally, decimation in a feedback loop can be implemented and very simple triangular filters can be applied to frequency samples for anti-aliasing, interpolation and constraints. Furthermore, higher flexibility can be achieved. The input oversampling factor can be changed by changing only the input FFT size. The rest of the processing flow can remain the same.

[0065] figure 1 A schematic block diagram showing a top-level block diagram of a linear equalizer with two independent channels X and Y according to a first embodiment. The equalizer consists of an input data stream X in and the output stream X out The data path 10 of channel X, and the input data stream Y with in and output stream Y out data ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to an apparatus and method of processing a digital signal, wherein an input signal is transformed into the frequency domain by applying a fast Fourier transformation (FFT) processing to obtain a transformed input signal. Positive and negative frequency components of the transformed input signal are separated and respective ones of the separated positive and negative frequency components are separately processed by respective digital filtering to obtain filtered frequency components. The filtered frequency components are combined in the frequency domain using a down-sampling operation for down-sampling the filtered frequency components from an input number of samples per symbol to a different output number of samples per symbol, and the combined output components are converted into the time domain by applying an IFFT processing.

Description

technical field [0001] The invention relates to an apparatus and method for processing digital signals in a frequency-domain linear equalizer of a coherent optical receiver. Background technique [0002] An important goal of long-haul fiber optic systems is to transmit high data throughput over long distances without signal regeneration. Maximizing spectral efficiency is important given the constraints on bandwidth imposed by optical amplifiers and ultimately by the fiber itself. However, considering the constraints imposed by fiber nonlinearity on signal power, maximizing power (or signal-to-noise ratio (SNR)) efficiency, that is, minimizing the average transmission energy required per bit (or per bit The required SNR)) is also very important. Most existing systems use binary modulation formats such as on-off keying or differential phase-shift keying, which encode one bit per symbol. Non-coherent detection and differential coherent detection offer good power efficiency o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/69
CPCH04L25/03159H04B2210/252H04B10/6971H04B7/0413
Inventor 迈克尔·查如冰多伦·科恩薛青松多利·吉得隆刘玲解长松李良川陈铭
Owner HUAWEI TECH CO LTD