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US 6,285,307 B1Granted
Method of and a device for analog signal sampling
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorPaulus Thomas Maria Van Zeijl
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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorPaulus Thomas Maria Van Zeijl
Estimating the term…
A method and a device of sampling an analog signal (U(t)) by obtaining first sequences of discrete sample values (SI1(t), SQ1(t)) of In-phase (I) and Quadrature-phase (Q) components (Ui(t), UQ(t)) of the analog signall (U(t)) and second sequences of discrete sample values (SI2(t), SQ2(t)) of the I and Q components (Ui(t), UQ(t)), by sampling of the I and Q components with sampling sequences (φ1(t), φ2(t)) having equal sampling rate (ωs) and a mutual phase shift of 90° relative to their sampling rate period (T). The sample values of the I component of the first sequence (SI1(t)) and the sample values of the Q component of the second sequence (SQ2(t)) are summed (9) to form a third sequence of sample values S3(t). The sample values of the Q component of the first sequence (SQ1(t)) and the sample values of the I component of the second sequence SI2(t)) are summed (10) to form a fourth sequence of sample values (S4(t)). The third and fourth sequences of sample values (S3(t), S4(t)) are further processed during an interval of a particular period (T) of the third and fourth sequences (S3(t), S4(t)) and starting after the sample values of the first and second sequences (SI1(t), SI2(t), SQ1(t), SQ2(t)) of said period (T) are available.
A method of sampling an analog signal, comprising the steps of:
An analog signal sampling device, comprising means for converting an analog signal into In-phase I and Quadrature-phase Q components, means for converting said I and Q components at a sampling rate into first and second sequences of discrete sample values such that said first and second sequences comprise a mutual phase-shift of 90° relative to their sampling rate period, means for summation of sample values of said I component of said first sequence and sample values of said Q component of said second sequence, outputting a third sequence of sample values, means for summation of negative sample values of said I component of said second sequence and sample values of said Q component of said first sequence, outputting a fourth sequence of sample values, wherein said summation means are arranged to operate at each sampling rate period.
A communication device, comprising an analog sampling device having means for converting an analog signal into In-phase I and Quadrature-phase Q components, means for converting said I and Q components at a sampling rate into first and second sequences of discrete sample values such that said first and second sequences comprise a mutual phase-shift of 90° relative to their sampling rate period, means for summation of sample values of said I component of said first sequence and sample values of said Q component of said second sequence, outputting a third sequence of sample values, means for summation of negative sample values of said I component of said second sequence and sample values of said Q component of said first sequence, outputting a fourth sequence of sample values, wherein said summation means are arranged to operate at each sampling rate period, and means for receiving an analog signal, wherein said sampling device is operatively connected for receiving said analog signal.
Dependencies are inferred from the claim text.