US 6,714,520 B1 · System, apparatus method for multi-carrier transmission

Abstract

A system for multi-carrier transmission which can secure the transmission capacity under the noise environment whose noise changes cyclically is provided. A mapping section in an ATU-C (ADSL transceiver unit, central office end) memorizes the bit allocation allocating to each carrier and transmission power allocation using for each carrier at the period that the noise generated at the data transmission to a downstream direction is large and the bit allocation allocating to each carrier and transmission power allocation using for each carrier at the period that the noise generated at the data transmission to an upstream direction is large. And a demapping section in an ATU-R (ADSL transceiver unit, remote terminal end) also memorizes the memorized bit allocation and transmission power allocation. At the time of the data transmission to the downstream direction, the bit allocation and transmission power allocation is allocated to each carrier of the high frequency band, by making the bit rate at the period that the noise generated at the data transmission to the downstream direction is small higher than the bit rate at the period that the noise is large. With this, the transmission capacity to the downstream direction can be secured.

Claims52

Dependent claims

A system for multi-carrier transmission which implements data transmission using the multi-carrier between a first communication equipment and a second communication equipment interactively under the noise environment that the changing timing of noise level is known, wherein:

said first communication equipment switches bit rates of the data transmission using a first frequency band corresponding to the changing timing of noise level and comprises a first transmitting means for transmitting the data to said second communication equipment,
said second communication equipment switches bit rates of the data transmission using a second frequency band corresponding to the changing timing of noise level and comprises a second transmitting means for transmitting the data to said first communication equipment,
said system for multi-carrier transmission makes the bit rate with which said second transmitting means implements the data transmission of a second direction from said second communication equipment to said first communication equipment using said second frequency band higher than the bit rate with which said first transmitting means implements the data transmission of the first direction from said first communication equipment to said second communication equipment using said first frequency band, during the period that the noise generated at the data transmission of said first direction from said first communication equipment to said second communication equipment is large.

A system for multi-carrier transmission which implements the data transmission using the multi-carrier between the first communication equipment and the second communication equipment interactively under the noise environment that the changing timing of noise level is known, wherein:

said first communication equipment, comprising:
a first temporarily memorizing means for memorizing the data transmitted from external equipment temporarily;
a first memorizing means which memorizes the two kinds of the bit allocation allocating to each carrier and transmission power allocation using for each carrier of the first frequency band transmitting the data, at the period that the noise generated at the data transmission to the first direction being from said first communication equipment to said second communication equipment is large and at the period that the noise generated at the data transmission to the second direction being from said second communication equipment to said first communication equipment is large;
a first modulating means which reads out the two kinds of bit allocation and transmission power allocation memorized in said first memorizing means and also reads out the data memorized in said first temporarily memorizing means, and selects the bit allocation allocating to each carrier and transmission power allocation using for each carrier of said first frequency band corresponding to the noise level at the data transmission, and modulates the amplitude of said each carrier to the amplitude corresponding to the selected bit allocation and transmission power allocation and the order of bits of the data allocating to said each carrier;
a first IFFT (inverse fast Fourier transform) means which adds up each carrier of said first frequency band modulated the amplitude at said first modulating means and outputs the voltage value expressed in digital form;
a transmitting means providing a first DAC (digital to analog converter) means which converts the voltage value expressed in digital form outputted from said first IFFT means to analog signals and outputs to a loop;
and
a first filter means which removes side lobes generated at said second frequency band by the carrier of said first frequency band outputted to the loop by said first DAC means,
and allocates the bit allocation and transmission power allocation to each carrier of said first frequency band, by making the bit rate during the period that the noise generated at the data transmission to said second direction is large higher than the bit rate during the period that the noise generated at the data transmission to said first direction is large, by said first modulating means.

6 more elements

An apparatus for multi-carrier transmission which implements the data transmission using the multi-carrier under the noise environment that the changing timing of noise level is known, comprising:

a transmitting means which implements the data transmission using each carrier of a first frequency band, by making the bit rate of the data transmission implementing during the period that the noise becomes large at the counter communication equipment higher than the bit rate of the data transmission implementing during the period that the noise becomes large at the apparatus for multi-carrier transmission.

An apparatus for multi-carrier transmission which implements the data transmission using the multi-carrier under the noise environment that the changing timing of noise level is known, wherein:

said apparatus for multi-carrier transmission, comprising:
a first temporarily memorizing means for memorizing the data transmitted from external equipment temporarily;
a first memorizing means which memorizes the two kinds of the bit allocation allocating to each carrier and transmission power allocation using for each carrier of the first frequency band transmitting the data, at the period that said noise is large at said apparatus for multi-carrier transmission and at the period that said noise is large at said counter communication equipment;
a first modulating means which reads out the two kinds of bit allocation and transmission power allocation memorized in said first memorizing means and also reads out the data memorized in said first temporarily memorizing means, and selects the bit allocation allocating to said each carrier and transmission power allocation using for said each carrier of said first frequency band corresponding to the noise level at the data transmission, and modulates the amplitude of said each carrier to the amplitude corresponding to the selected bit allocation and transmission power allocation and the order of bits of the data allocating to said each carrier;
an IFFT (inverse fast Fourier transform) means which adds up each carrier of said first frequency band modulated the amplitude at said first modulating means and outputs the voltage value expressed in digital form;
a transmitting means providing a DAC (digital to analog converter) means which converts the voltage value expressed in digital form outputted from said IFFT means to analog signals and outputs to a loop;
and
a first filter means which removes side lobes generated at said second frequency band by the carrier of said first frequency band outputted to the loop by said DAC means,
and allocates the bit allocation and transmission power allocation to each carrier of said first frequency band, by making the bit rate during the period that said noise is large at said counter communication equipment higher than the bit rate during the period that said noise is large at said apparatus for multi-carrier transmission, by said modulating means.

6 more elements

A method for multi-carrier transmission at a system for multi-carrier transmission which implements data transmission using the multi-carrier between a first communication equipment and a second communication equipment interactively under the noise environment that the changing timing of noise level is known, wherein:

said first communication equipment, comprising:
a switching process which switches the bit allocation allocating to each carrier of a first frequency band which transmits the data corresponding to the changing timing of noise level;
an allocating process which allocates the data to each carrier of said first frequency band corresponding to the switched bits allocation;
and
a first data transmitting process including a transmitting process which transmits each carrier allocated data of said first frequency band to said second communication equipment,
said second communication equipment, comprising:
a switching process which switches the bit allocation allocating to each carrier of a second frequency band which transmits the data corresponding to the changing timing of noise level;
an allocating process which allocates the data to each carrier of said second frequency band corresponding to the switched bits allocation;
and
a second data transmitting process including a transmitting process which transmits each carrier allocated data of said second frequency band to said first communication equipment,
said method for multi-carrier transmission, at the period that the noise is large at the data transmission of a first direction from said first communication equipment to said second communication equipment, makes the bit rate of the data transmission of said second direction from said second communication equipment to said first communication equipment using said second frequency band higher than the bit rate of the data transmission of said first direction from said first communication equipment to said second communication equipment using said first frequency band.

8 more elements

A method for multi-carrier transmission under the noise environment that the changing timing of noise level is known, comprising:

a bit allocation switching process which switches the bit allocation allocating to each carrier of a first frequency band corresponding to the changing timing of noise level, at an apparatus for multi-carrier transmission implementing the data transmission using said first frequency band;
an allocating process which allocates data to each carrier of said first frequency band, by using the switched bit allocation;
and
a transmitting process including a carrier transmitting process which transmits each carrier of said first frequency band allocated data to a counter communication equipment,
and makes the bit rate of the data transmission implementing at the period that the noise level becomes large at said counter communication equipment higher than the bit rate of the data transmission implementing at the period that the noise level becomes large at said apparatus for multi-carrier transmission.

2 more elements

Dependencies are inferred from the claim text.

System, apparatus method for multi-carrier transmission

Life of this patent

System, apparatus method for multi-carrier transmission

Life of this patent

Abstract

Claims52