Master-slave data transmission in orthogonal frequency-division multiplexing
AssigneeSTMicroelectronics S.r.l.
InventorDenis J. Mestdagh
Life of this patent
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Abstract
A method for transmitting data between a master modem and at least one slave modem of a master-slave network in orthogonal frequency-division multiplexing, including assigning to each slave modem at least one transmit frequency band and at least one receive frequency band chosen in a range of frequencies likely to be processed by the master modem; and in each slave modem: oversampling, respectively undersampling, each transmitted or received symbol; and filtering upstream of the oversampling, respectively of the undersampling, by a band-pass filter of the corresponding assigned frequency band.
Claims17
A method for communicating data between a master modem and at least one slave modem of a master-slave network in orthogonal frequency-division multiplexing, including:
- assigning to each slave modem at least one transmit frequency band and at least one receive frequency band chosen in a range of frequencies of the master modem;
- and
- in each slave modem:
- oversampling a transmitted symbol containing the data;
- and
- filtering, downstream of the oversampling, using a band-pass filter having a pass band corresponding to the slave modem's assigned transmit frequency band, wherein the oversampling ratios are different for each slave modem and are chosen according to the assigned frequency bands.
A method for communicating data between a master modem and at least one slave modem of a master-slave network in orthogonal frequency-division multiplexing, including:
- assigning to each slave modem at least one transmit frequency band and at least one receive frequency band chosen in a range of frequencies of the master modem;
- and
- in each slave modem:
- filtering a received symbol containing the data using a band-pass filter having a pass band corresponding to the slave modem's assigned receive frequency band;
- and
- undersampling the filtered symbol, wherein the undersampling ratios are different for each slave modem and are chosen according to the assigned frequency bands.
For use in an orthogonal frequency-division multiplexed (OFDM) network, a slave modem to produce an output in a selected frequency band, comprising:
- a Fourier transform circuit to convert digital data to OFDM symbols;
- an oversampler connected to an output of the Fourier transform circuit to produce a symbol in the selected frequency band;
- a band-pass filter connected to an output of the oversampler having a pass band including the selected frequency band to selectively pass the symbol n the selected frequency band;
- a parallel-to-series converter connected between the Fourier transform circuit and the oversampler;
- and
- a processing circuit connected between the parallel-to-series converter and the oversampler, to apply a cyclic prefix and a cyclic suffix to at least one of the OFDM symbols.
For use in an orthogonal frequency-division multiplexed (OFDM) network, a slave modem to receive an OFDM symbol in a selected frequency band, comprising:
- a band-pass filter to selectively pass symbols in a pass band which includes the selected frequency band;
- an undersampler connected to an output of the pass band filter to convert the symbol to the base band;
- a Fourier transform circuit connected to the output of the undersampler, the Fourier transform circuit converting the OFDM symbol to digital data;
- a series-to-parallel converter connected between the undersampler and the Fourier transform circuit;
- and
- a processing circuit connected between the series-to-parallel converter and the undersampler, to eliminate a cyclic prefix and a cyclic suffix from at least one of the OFDM symbols.
Dependencies are inferred from the claim text.