Receiver architecture for linear modulation based communication systems
AssigneeInstitut Mines-Telecom / Telecom Bretagne
InventorsJérémy NADAL, Charbel ABDEL NOUR, Amer BAGHDADI
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Abstract
A receiver for Filter Bank Multicarrier frequency spread signals such as FBMC, FBMC/OQAM, OFDM, comprises a linear phase rotation module adapted to introduce a linear phase rotation to a received time domain signal, a discrete Fourier transform and a Finite Impulse response digital filter. The coefficients of the digital filter define a shift of the frequency response of the prototype filter of the receiver, and the coefficients of the digital filter are fixed so as to compensate the linear phase rotation introduced by the filter. The frequency shift introduced may be equal to the reciprocal of a power of two of the modulation sub carrier spacing.
Claims14
A Filter Bank Multicarrier frequency spread receiver for decoding a signal, said receiver comprising a linear phase rotation module adapted to introduce a linear phase rotation to a time domain signal, a Discrete Fourier Transform unit, and a Finite Impulse Response digital filter, wherein coefficients of said Finite Impulse Response digital filter define a shift of a frequency response of a prototype filter of said receiver, and wherein said introduced linear phase rotation is compensated by the frequency shift of said Finite Impulse Response digital filter.
A method of defining a filter for a digital radio receiver, said method comprising defining a prototype filter, obtaining a frequency shifted version of said prototype filter, and truncating coefficients defining said frequency shifted version of said prototype filter to a minimum number of coefficients enabling said frequency shifted version of said prototype filter to achieve a predefined Signal to Noise level.
A method of decoding a Filter Bank Multicarrier encoded signal, said method comprising obtaining digital samples at a specified sampling rate, grouping said samples into groups of predetermined size, imposing a frequency shift equal to a predetermined fraction of the sub-carrier space on said groups, transforming the time-domain frequency shifted and grouped samples to the frequency domain, and filtering the frequency domain shifted values to compensate said frequency shift.
Dependencies are inferred from the claim text.