Receiver, transceiver system and associated receiving method
AssigneeInstitut Mines-Telecom
InventorRaphaël Le Bidan
Life of this patent
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Abstract
The receiver includes a sampler designed to provide one or more samples (yn) per received symbol, the symbols belonging to a predefined alphabet; an equalizer designed to compute, for each received symbol, an estimate (zn) of this symbol based on a linear combination (y′n) of the samples (yn) for this symbol; and a decision module designed to determine the symbol of the alphabet closest to the estimate (zn) as detected symbol. The alphabet exhibits a decentering such that the transmitted symbols have a non-zero predefined expectation, and the equalizer is designed to add a non-zero scalar component (θ) to the linear combination (y′n) in order to compensate at least partially for the decentering.
Claims15
A digital data receiver comprising:
- a sampler configured to sample a received signal (r(t)) that has propagated in a propagation channel, N symbols being encoded in the received signal (r(t)), N being an integer, in order to provide a set of blocks of samples for the N symbols, the N symbols being selected from a predefined alphabet (Ω) having K symbols, K being an integer, the sampler providing N blocks of M samples, M being at least equal to 1;
- an equalizer configured to compute, for each symbol (sn) among the N symbols, an estimate (zn) of said symbol (sn) based on the samples provided by the sampler, the equalizer comprising a sample combiner configured to receive said samples provided by the sampler, and to provide a linear combination of said samples, said estimate (zn) of said symbol (sn) being determined from said linear combination;
- and
- a decision module configured to determine detected symbols, a detected symbol being determined for each estimate (zn) computed for a symbol (sn), a detected symbol (ŝn) being a symbol selected from said K symbols in the predefined alphabet (Ω) that is the closest to the estimate (zn) computed for each symbol (sn);
- wherein the predefined alphabet (Ω) exhibits a decentering such that each of said N symbols have a non-zero predefined expectation ([sn]), and the equalizer is configured to add a non-zero scalar component (θ) to said linear combination in order to compensate at least partially for the decentering;
- the equalizer being configured to iteratively update the non-zero scalar component (θ) from the detected symbols previously determined by the decision module.
A method for receiving digital data, comprising:
- a step of sampling, by a sampler, a received signal (r(t)) that has propagated in a propagation channel, N symbols being encoded in this received signal (r(t)) N being an integer, in order to provide a set of blocks of samples for the N symbols, the N symbols being selected from a predefined alphabet (Ω) having K symbols, K being an integer, the sampling step providing N blocks of M samples, M being at least equal to 1;
- a step of performing a linear equalization, by an equalizer, comprising computing, for each symbol (sn), an estimate (zn) of said symbol (sn) from the samples provided by the sampling step, the linear equalization step comprising performing a linear combination of the samples provided by the sampling step, said estimate (zn) of said symbol being determined from the linear combination;
- and
- a step of determining detected symbols, a detected symbol (ŝn) being determined for each estimate (zn) computed for a symbol (sn), a detected symbol (ŝn) being a symbol selected from said K symbols in the predefined alphabet (Ω) that is the closest to the estimate (zn);
- wherein the predefined alphabet (Ω) exhibits a decentering such that each of the N symbols (sn) have a non-zero predefined expectation ([sn]), and the linear equalization comprises adding a non-zero scalar component (θ) to the linear combination in order to compensate at least partially for the decentering, the non-zero scalar component (θ) being iteratively updated from the previously determined detected symbols.
Dependencies are inferred from the claim text.