Modulation method and device delivering a multicarrier signal, and corresponding demodulation method and device and computer program
AssigneeOrange
InventorsHao Lin, Pierre Siohan
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Abstract
A method is provided for modulating data symbols, outputting a multi-carrier signal, implementing: a mathematical transform, which transforms data symbols from the frequency domain to a time domain, outputting transformed symbols; and a polyphase filtering, which filters the transformed symbols, outputting the multi-carrier signal. The polyphase filtering uses an expansion factor taking account of a compression factor t, the compression factor τ being a number between 0 and 1 such that the multi-carrier signal can be transmitted at a Faster-Than-Nyquist rate.
Claims13
A method comprising:
- modulating data symbols with a modulator device, outputting a multi-carrier signal, implementing:
- a mathematical transform step, which transforms the data symbols from a frequency domain to a time domain, outputting transformed symbols,
- a polyphase filtering step, which filters said transformed symbols, outputting said multi-carrier signal, wherein the polyphase filtering step uses an expansion factor taking account of a compression factor τ, said compression factor τ being a number between 0 and 1;
- and
- transmitting the multi-carrier signal at a faster-than-Nyquist rate.
A modulator device for modulating data symbols, outputting a multi-carrier signal, comprising:
- a mathematical transform module configured to transform data symbols, from a frequency domain to a time domain, outputting transformed symbols;
- a polyphase filtering module configured to filter said transformed symbols, outputting said multi-carrier signal, wherein said polyphase filtering module uses an expansion factor taking account of a compression factor τ, said compression factor τ being a number between 0 and 1;
- and
- an output through which the multi-carrier signal is transmitted.
A method comprising:
- receiving a multi-carrier signal;
- demodulating the multi-carrier signal, outputting estimated data symbols, implementing:
- a polyphase filtering step, which filters said multi-carrier signal, outputting data symbols in the time domain, and
- a mathematical transform step, which transforms said data symbols in the time domain, from a time domain to the frequency domain, outputting data symbols in the frequency domain, wherein said polyphase filtering step implements a decimation factor taking account of a compression factor τ, said compression factor τ being a number between 0 and 1.
A demodulating device for demodulating a multi-carrier signal, outputting estimated data symbols, comprising:
- an input, which receives the mutli-carrier signal:
- a polyphase filtering module configured to filter said multi-carrier signal, outputting data symbols in the time domain,
- a mathematical transform module configured to transform said data symbols, from a time domain to a frequency domain, outputting data symbols in the frequency domain, wherein said polyphase filtering module uses a decimation factor taking account of a compression factor τ, said compression factor τ being a number between 0 and 1.
A computer-readable storage medium comprising a computer program stored thereon, which includes instructions for performing a method when this program is run using a processor of a modulator device, wherein the method comprises:
- modulating data symbols with a modulator device, outputting a multi-carrier signal, implementing:
- a mathematical transform step, which transforms the data symbols from a frequency domain to a time domain, outputting transformed symbols,
- a polyphase filtering step, which filters said transformed symbols, outputting said multi-carrier signal, wherein the polyphase filtering step uses an expansion factor taking account of a compression factor τ said compression factor τ being a number between 0 and 1;
- and transmitting the multi-carrier signal at a faster-than-Nyquist rate.
Dependencies are inferred from the claim text.