Method for disturbance compensation of signal generated by discrete multitone-modulation and circuit arrangement for implementing said method
A discrete multi-tone modulation and signal technology, applied in every field, can solve the problems of high computational cost, high circuit cost of time domain compensator, and high circuit cost
Inactive Publication Date: 2003-08-13
LANTIQ BET GMBH & CO KG
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, this solution has the disadvantage that, due to the large number of coefficients (20 to 40 coefficients), an additional high circuit cost must be paid for the time-domain compensator, which here acts as a time-domain compensation The digital transversal filter used by the
Another disadvantage of this time-domain compensator is the high computational cost of 50 to 100 million multiplications per second with a filter length of 20 to 40 coefficients and thus a correspondingly high circuit cost
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0027] figure 1 A first embodiment of a circuit arrangement for compensating disturbances in a signal generated using discrete multi-tone modulation is shown. A serial-to-parallel converter 1 receives digital values of a signal IN generated using discrete multi-tone modulation. The serial-to-parallel converter 1 groups the supplied digital sampled values into blocks, where a block has N parallel signals, which are supplied to the demodulator 2 . where N shall be a power of two.
[0028] Demodulator 2 is a Fast Fourier Transformer that converts N parallel signals delivered in the time domain into n carrier frequencies f in the frequency band0 -f n , where each carrier frequency is modulated with quadrature amplitude modulation (QAM) when performing discrete multitone modulation. Each carrier frequency has a signal vector 20a, 20b to 2na, 2nb.
[0029] For example, on an asymmetric digital subscriber line with 256 carrier frequencies each with a frequency spacing of 4.31...
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
Login to View More Abstract
The invention relates to a method for disturbance compensation of a signal generated by discrete multitone-modulation. The signal generated by discrete multitone-modulation is provided with a plurality of carrier frequencies and each carrier frequency is provided with a signal vector. A reference signal vector being a signal vector of the plurality of signal vectors generates an error signal vector. Said error signal vector is added to each remaining signal vector of the plurality of signal vectors in order to achieve disturbance compensation. A set of adjustable coefficients is allocated to each signal vector of the plurality of signal vectors other than the reference signal vector and is multiplied with said error signal vector before addition.
Description
technical field [0001] The invention relates to a method for compensating interference in a signal generated using discrete multi-tone modulation, wherein the signal generated using discrete multi-tone modulation has a plurality of carrier frequencies and each carrier frequency has a signal vector, and to a Circuit arrangement for compensating disturbances in a signal generated using discrete multi-tone modulation, wherein the signal generated using discrete multi-tone modulation has a plurality of carrier frequencies in a frequency band and wherein each carrier frequency has a signal vector. Background technique [0002] Discrete Multi-Tone Modulation (DMT), also known as multi-carrier modulation, is a modulation method especially suitable for data transmission on linearly distorted channels. In contrast to so-called single-carrier methods, such as amplitude modulation, which have only one carrier frequency, discrete multi-tone modulation uses multiple carrier frequencies. ...
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
Login to View More IPC IPC(8): H04J11/00H04L25/03
CPCH04L2025/03611H04L2025/03522H04L25/03159H04L2025/03414
Inventor 海因里希·申克迪特马尔·施特罗伊斯尼希斯特凡·施奈德
Owner LANTIQ BET GMBH & CO KG