Signal component demultiplexing apparatus, filter apparatus, receiving apparatus, communication apparatus, and communication method

A receiving apparatus used in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, comprising:

• a receiving means for receiving a group of signals;
• a signal component demultiplexing apparatus comprising branching circuits connected in stages and hierarchically by a branching method, each branching circuit provided with a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols, a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians with a reference 0 Hz, an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means;
• an orthogonal transforming means for orthogonally transforming the group of signals demultiplexed at said signal component demultiplexing apparatus;
• and
• a decoding means for decoding said orthogonally transformed information.

A communication apparatus having a transmitting apparatus and a receiving apparatus in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, wherein

• said transmitting apparatus has:
• an encoding means for independently encoding information of a plurality of channels,
• a signal point arranging means for arranging signal points by modulating said encoded information based on a predetermined modulation method,
• a signal multiplexing means for multiplexing said plurality of signal point-arranged signals cyclically on a time axis,
• an inverse orthogonal transforming means for inversely orthogonally transforming said multiplexed signal, and
• a transmitting means for transmitting said orthogonally transformed information and
• said receiving apparatus has:
• a receiving means for receiving said transmitted group of signals,
• a signal component demultiplexing means for selecting and demultiplexing said received group of signals,
• an orthogonal transforming means for orthogonally transforming said selected and demultiplexed signal, and
• a decoding means for decoding said orthogonally transformed information, wherein
• the signal component demultiplexing means is configured by branching circuits connected in stages and hierarchically by a branching method, each branching circuit including:
• a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols,
• a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians with a reference 0 Hz,
• an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and
• a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz.

A receiving apparatus used in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, comprising

• a receiving means for receiving a group of signals,
• a signal component demultiplexing apparatus comprising branching circuits connected in stages and hierarchically by a branching method, each branching circuit provided with a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols, a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians with a reference 0 Hz, an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz;
• a signal selecting means for selecting and outputting at least one group of symbols of predetermined subcarriers from among the symbol strings demultiplexed at said signal component demultiplexing apparatus;
• a frequency offset compensating means for compensating for frequency offset of at least one group of symbols selected and output by said signal selecting means;
• two orthogonal transforming means for orthogonally transforming output signals of said frequency offset compensating means;
• and
• a decoding means for decoding said orthogonally transformed signal.

A communication apparatus having a transmitting apparatus and a receiving apparatus used in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, wherein

• said transmitting apparatus has:
• an encoding means for independently encoding information of a plurality of channels,
• a signal point arranging means for arranging signal points by modulating said encoded information based on a predetermined modulation method,
• a signal multiplexing means for multiplexing said plurality of signal point-arranged signals cyclically on a time axis,
• an inverse orthogonal transforming means for inversely orthogonally transforming said multiplexed signal, and
• a transmitting means for transmitting said orthogonally transformed group of signals and
• said receiving apparatus has:
• a receiving means for receiving said transmitted group of signals,
• a signal component demultiplexing apparatus for demultiplexing said received group of signals configured by branching circuits connected in stages and hierarchically by a branching method, each branching circuit including:
• a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols,
• a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians,
• an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and
• a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz;
• a signal selecting means for selecting and outputting at least one group of symbols of predetermined subcarriers from among the symbol strings demultiplexed at said signal component demultiplexing apparatus;
• a frequency offset compensating means for compensating for frequency offset of at least one group of symbols selected and output by said signal selecting means;
• two orthogonal transforming means for orthogonally transforming output signals of said frequency offset compensating means;
• and
• a decoding means for decoding said orthogonally transformed signal.

A receiving apparatus in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, including:

• a receiving means for receiving a group of signals,
• a signal component demultiplexing apparatus for demultiplexing said received group of signals configured by branching circuits connected in stages and hierarchically by a branching method, each branching circuit provided with a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols, a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians, an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz;
• a frequency offset compensating means for compensating for frequency offset of at least one group of symbols selected and output by said signal selecting means;
• two orthogonal transforming means for orthogonally transforming output signals of said frequency offset compensating means;
• and
• a decoding means for decoding said orthogonally transformed signals.

A communication apparatus having a transmitting apparatus and receiving apparatus in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, wherein:

• said transmitting apparatus has
• an encoding means for independently encoding information of a plurality of channels,
• a signal point arranging means for arranging signal points by modulating said encoded information based on a predetermined modulation method,
• a signal multiplexing means for multiplexing said plurality of signal point-arranged signals cyclically on a time axis,
• an inverse orthogonal transforming means for inversely orthogonally transforming said multiplexed signal, and
• a transmitting means for transmitting said orthogonally transformed group of signals and
• said receiving apparatus has:
• a receiving means for receiving said transmitted group of signals,
• a signal component demultiplexing apparatus for demultiplexing said received group of signals configured by branching circuits connected in stages and hierarchically by a branching method, each branching circuit including:
• a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols,
• a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians,
• an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and
• a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz;
• a frequency offset compensating means for compensating for frequency offset of at least one group of symbols demultiplexed by said signal component demultiplexing apparatus;
• two orthogonal transforming means for orthogonally transforming output signals of said frequency offset compensating means;
• and
• a decoding means for decoding said orthogonally transformed signals.

A filter apparatus for extracting a specific signal from a group of multi-carrier modulated signals, provided with

• a signal component demultiplexing apparatus comprising branching circuits connected in stages and hierarchically by a branching method, each branching circuit provided with a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols, a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians with a reference 0 Hz, an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz;
• a signal selecting means for selecting and outputting a group of symbols of a specific subcarrier from among the symbol strings demultiplexed at said signal component demultiplexing apparatus;
• and
• a frequency offset compensating means for compensating for frequency offset of the group of symbols selected and output by said signal selecting means.

A receiving apparatus in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, including

• a receiving means for receiving a group of multi-carrier modulated signals;
• a filter apparatus for extracting a specific signal from the group of multi-carrier modulated signals received at said receiving means;
• an orthogonal transforming means for orthogonally transforming the signal extracted at the filter apparatus, and
• a decoding means for decoding said orthogonally transformed signal, wherein
• said filter apparatus comprises
• a signal component demultiplexing apparatus comprising branching circuits connected in stages and hierarchically by a branching method, each branching circuit provided with a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols, a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians with a reference 0 Hz, an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz;
• a signal selecting means for selecting and outputting a group of symbols of a specific subcarrier from among the symbol strings demultiplexed at said signal component demultiplexing apparatus;
• and
• a frequency offset compensating means for compensating for frequency offset of the group of symbols selected and output by said signal selecting means.

A receiving apparatus in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, comprising:

• a receiving means for receiving a group of multi-carrier modulated signals,
• a filter apparatus for extracting a specific signal from the group of multi-carrier modulated signals received at said receiving means,
• an orthogonal transforming means for orthogonally transforming the signal extracted at the filter apparatus, and
• a decoding means for decoding said orthogonally transformed signal, wherein
• said filter apparatus comprises:
• a subcarrier selecting means for selecting a subcarrier,
• at least one signal selecting means for selecting and outputting a specific group of signals from among the input group of signals in accordance with said selected subcarrier, and
• a frequency offset compensating means for compensating the frequency offset of a signal selected by said signal selecting means.

A filter apparatus for extracting a specific signal from a group of multi-carrier modulated signals, comprising:

• a pass subcarrier selection signal outputting means for outputting a complex sine wave signal in accordance with a channel to be selected,
• a multiplying means for multiplying a complex sine wave signal output from said pass subcarrier selection signal outputting means and the input group of signals,
• at least one signal component demultiplexing means for selecting a specific group of signals from the results of multiplication in said multiplying means, and
• a symbol rearranging means for rearranging the output of said signal component demultiplexing apparatus on the frequency axis.

A receiving apparatus in multiplex communication based on multi-carrier modulation where subcarriers of a plurality of channels are cyclically arranged, comprising:

• a receiving means for receiving a group of multi-carrier modulated signals,
• a filter apparatus for extracting a specific signal from the group of multi-carrier modulated signals received at said receiving means,
• an orthogonal transforming means for orthogonally transforming the signal extracted at the filter apparatus, and
• a decoding means for decoding said orthogonally transformed signal, wherein
• said filter apparatus is provided with:
• a pass subcarrier selection signal outputting means for outputting a complex sine wave signal in accordance with a channel to be selected,
• a multiplying means for multiplying a complex sine wave signal output from said pass subcarrier selection signal outputting means and the input group of signals,
• at least one signal component demultiplexing means for selecting a specific group of signals from the results of multiplication in said multiplying means, and
• a symbol rearranging means for rearranging the output of said signal component demultiplexing apparatus on the frequency axis.

A receiving apparatus in multiplex communication based on multi-carrier modulation where a plurality of channels of subcarriers are cyclically arranged, comprising:

• a receiving means for receiving a group of multi-carrier modulated signals,
• a switching means for switching the input group of signals,
• a buffer means for holding the group of multi-carrier modulated signals received at said receiving means,
• a filter apparatus connected after said switching means and for selecting and outputting a specific group of signals from the input group of signals,
• an orthogonal transforming means for orthogonally transforming the signals extracted at said filter apparatus, and
• a decoding means for decoding said orthogonally transformed signals, wherein
• said switching means outputs one symbol's worth of the group of signals to said filter apparatus, and said buffer means holds the input one symbol's worth of the group of signals during that time and transmits the group of signals held at said buffer means via said switching means to said filter apparatus after the end of transmitting the signals to said filter apparatus and
• said filter apparatus selects and outputs only a designated subcarrier from the group of signals input via said switching means.

A receiving apparatus in multiplex communication based on multi-carrier modulation where a plurality of channels of the subcarriers are cyclically arranged, comprising:

• a receiving means for receiving a group of multi-carrier modulated signals,
• a first filter apparatus for selecting and outputting a group of signals of even number carriers from a group of multi-carrier modulated signals received at said receiving means,
• a second filter apparatus for selecting and outputting a group of signals of odd number carriers from a group of multi-carrier modulated signals received at said receiving means,
• a buffer means for holding the output group of signals of said second filter apparatus,
• a switching means for switching the output group of signals of said first filter apparatus,
• an orthogonal transforming means connected after said switching means and orthogonally transforming the switched output signals, and
• a decoding means for decoding said orthogonally transformed signals, wherein
• said switching means transmits the output signals of said first filter apparatus to said orthogonal transforming means and transmits the group of signals held at said buffer means via said switching means to said orthogonal transforming means after the end of transmitting the signals to said orthogonal transforming means.

A receiving apparatus as set forth in claim 41, wherein

• each of said first and second filter apparatuses comprises:
• said filter apparatus includes
• a signal component demultiplexing apparatus comprising branching circuits connected in stages and hierarchically by a branching method, each branching circuit provided with a symbol delaying means for delaying an input group of signals by N/2(m+1) symbols, a phase offset adjusting means for shifting the phase of the input group of signals by −π(k/2m) radians with a reference 0 Hz, an adding means for adding an output signal of said symbol delaying means and an output signal of said phase offset adjusting means to calculate one symbol string alternately positioned on a frequency axis in a multiplexed signal input to a signal selecting and outputting means, and a subtracting means for subtracting the output signal of said phase offset adjusting means from the output signal of said symbol delaying means to calculate the other symbol string alternately positioned on the frequency axis in the multiplexed signal input to said signal selecting and outputting means, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz;
• a signal selecting means for selecting and outputting a group of symbols of a specific subcarrier from among the symbol strings demultiplexed at said signal component demultiplexing apparatus;
• and
• a frequency offset compensating means for compensating for frequency offset of the group of symbols selected and output by said signal selecting means.

A communication method comprising

• an encoding and transmitting step including the steps of
• independently encoding information of a plurality of channels,
• arranging signal points by modulating said encoded information based on a predetermined modulation method,
• multiplexing said plurality of signal point-arranged signals cyclically on a time axis,
• inversely orthogonally transforming said multiplexed signal, and
• transmitting said orthogonally transformed information and
• a receiving and decoding step including the steps of
• receiving said transmitted signal,
• selecting and outputting only the signal of an intended channel from among said received multiplexed signal after the orthogonal transformation,
• orthogonally transforming said selected and output signal, and
• decoding said orthogonally transformed information, wherein
• the signal selection processing in said receiving step comprises:
• giving a delay of N/2(m+1) symbols,
• shifting the phase by exactly π(k/2m) radians, and
• performing branched and in stages the procedure of adding said symbol delayed signal and said phase shifted signal to calculate one symbol string alternately located on the frequency axis in said input multiplexed signal or subtracting said phase shifted signal from said symbol delayed signal to calculate the other symbol string alternately located on the frequency axis in said input multiplexed signal, wherein
• m is a parameter indicating the position of a stage of the branching circuit,
• N is the number of symbols existing within one modulation time, and
• k is a parameter indicating that a group of signals having a frequency offset of a subcarrier is input with a reference 0 Hz.