Communication apparatus

A communication apparatus employing a multi-carrier transmission method which performs data transmission with digital multi-carrier modulation and demodulation processes utilizing a real coefficient wavelet filter bank, which comprises a receiver that performs a digital multi-carrier demodulation process, wherein

• the receiver having a wave detecting section,
• the wave detecting section has:
• a first wavelet transformer involving M real coefficient wavelet filters, which are orthogonal with respect to each other, for performing a wavelet transform of waveform data of received signal;
• a second wavelet transformer involving wavelet filters for performing a Hilbert transform, a wavelet transform, and an inversion of codes in odd-numbered places, for the waveform data;
• and
• a complex data generator for generating complex data, by defining outputs from the first wavelet transformer as in-phase components of the complex information and outputs from the second wavelet transformer as orthogonal components of the complex information.

A communication apparatus employing a multi-carrier transmission method which performs data transmission with digital multi-carrier modulation and demodulation processes utilizing a real coefficient wavelet filter bank, which comprises a transmitter that performs a digital multi-carrier modulation process and a receiver that performs a digital multi-carrier demodulation process, wherein

• the transmitter has:
• a synchronization data generator for generating data for synchronization that remain same for a duration of several consecutive symbols and that are known in the receiver;
• and
• an inverse wavelet transformer for performing an inverse wavelet transform of the synchronization data, and
• the receiver has:
• a wave detecting section having a first wavelet transformer involving M real coefficient wavelet filters, which are orthogonal with respect to each other, for performing a wavelet transform of waveform data of received signal;
• a Hilbert transformer for performing a Hilbert transform of the waveform data;
• a second wavelet transformer for performing a wavelet transform of outputs from the Hilbert transformer;
• and a complex data generator for generating complex data, by defining outputs from the first wavelet transformer as in-phase components of complex information and outputs from the second wavelet transformer as orthogonal components of the complex information;
• an equalizer for performing equalization using complex information obtained from the wave detecting section and known signal for equalization that is previously assigned for the equalization process;
• a judgment unit for making a judgment using signal obtained from the equalizer;
• and
• a synchronization timing estimating circuit for estimating a timing of synchronization of symbols from phase differences between adjacent complex subcarriers output from the wave detecting section.

A communication apparatus employing a multi-carrier transmission method which performs data transmission with digital multi-carrier modulation and demodulation processes utilizing a real coefficient wavelet filter bank, which comprises a transmitter that performs a digital multi-carrier modulation process and a receiver that performs a digital multi-carrier demodulation process, wherein

• the transmitter has:
• a synchronization data generator for generating data for synchronization that remain same for a duration of several consecutive symbols and that are known in the receiver;
• and
• an inverse wavelet transformer for performing an inverse wavelet transform of the synchronization data, and
• a wave detecting section of the receiver has:
• a wavelet transformer involving M real coefficient wavelet filters, which are orthogonal with respect to each other, for performing a wavelet transform of waveform data of received signal;
• a complex data generator for generating complex data, by defining (2n−1)th outputs(n is a positive integer) from the wavelet transformer as in-phase components of the complex information and 2n-th outputs (where 1≦n≦(M/2−1) and subcarriers are numbered from 0 to M−1) from the wavelet transformer as orthogonal components of the same.

A communication apparatus employing a multi-carrier transmission method which performs data transmission with digital multi-carrier modulation and demodulation processes utilizing a real coefficient wavelet filter bank, which comprises a transmitter that performs a digital multi-carrier modulation process and a receiver that performs a digital multi-carrier demodulation process, wherein

• a modulating section of the transmitter has:
• a symbol mapper for converting bit data into symbol data and mapping the symbol data to M/2 (M is a plural number) complex coordinate planes;
• an inverse wavelet transformer involving M real coefficient wavelet filters, which are orthogonal with respect to each other;
• and
• a complex data decomposer for decomposing complex data into a real part and an imaginary part such that in-phase components of the complex information are supplied to the inverse wavelet transformer as (2n−1)th (n is a positive integer) inputs and such that orthogonal components of the complex information are supplied to the inverse wavelet transformer as 2n-th (where 1≦n≦(M/2−1) and subcarriers are numbered from 0 to M−1) inputs.

A communication apparatus employing a multi-carrier transmission method which performs data transmission with digital multi-carrier modulation and demodulation processes utilizing a real coefficient wavelet filter bank, which comprises a transmitter that performs a digital multi-carrier modulation process and a receiver that performs a digital multi-carrier demodulation process, wherein

• the transmitter has:
• a synchronization data generator for generating data for synchronization that remain same for a duration of several consecutive symbols and that are known in the receiver;
• and
• a modulating section for modulating with the synchronization data,
• the receiver has:
• a wave detecting section having a wavelet transformer involving M real coefficient wavelet filters, which are orthogonal with respect to each other, for performing a wavelet transform of waveform data of received signal;
• a complex data generator for generating complex data, by defining (2n−1)th outputs(n is a positive integer) from the wavelet transformer as in-phase components of the complex information and 2n-th outputs (where 1≦n≦(M/2−1) and subcarriers are numbered from 0 to M−1) from the wavelet transformer as orthogonal components of the same;
• and
• a synchronization timing estimation circuit for estimating a timing of synchronization of symbols from phase differences between adjacent complex subcarriers.

A communication apparatus utilizing a power line as a transmission path, comprising a transmitter that performs a digital multi-carrier modulation process and a receiver that performs a digital multi-carrier demodulation process, and utilizing a filter bank involving a plurality of filters in a modulation/demodulation process section,

• a transmitting section of the transmitter has:
• a symbol mapper for converting bit data into symbol data and mapping the symbol data according to certain signal point mapping information;
• and
• a modulator, which utilizies a filter bank involving M filters orthogonal to each other, for performing an inverse transform of a signal to be transmitted which is signal-points-arranged by the symbol mapper to modulate, and
• a wave detecting section of the receiver has a filter bank, which involves M filters that are orthogonal with respect to each other, for transforming a received signal to demodulate.