Method and apparatus for reducing data distortion and improving simulcast reception
First Claim
Patent Images
1. A method for reducing data distortion received at a selective call receiver within a simulcast system, comprising the steps of:
- detecting a simulcast signal having a plurality of symbols each having a corresponding symbol center area and symbol edge area;
windowing at least one of the symbol edge areas or symbol center areas in the simulcast signal correspondingly providing a windowed symbol edge area or a windowed symbol center area; and
clipping at least one of the windowed symbol edge area or the windowed symbol center area.
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Abstract
A selective call receiver unit (700) capable of reducing data distortion and improving simulcast reception includes a selective call receiver (20), a demodulator (30) coupled to the selective call receiver and a circuit (36 and 300) coupled to the demodulator for reducing data distortion received at a selective call receiver. The circuit includes a detector (350) for detecting a simulcast signal, a filter (351) for windowing the symbol edge area in the simulcast signal providing a windowed symbol edge area, and a clipping circuit (36) for clipping the windowed symbol edge area.
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Citations
22 Claims
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1. A method for reducing data distortion received at a selective call receiver within a simulcast system, comprising the steps of:
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detecting a simulcast signal having a plurality of symbols each having a corresponding symbol center area and symbol edge area;
windowing at least one of the symbol edge areas or symbol center areas in the simulcast signal correspondingly providing a windowed symbol edge area or a windowed symbol center area; and
clipping at least one of the windowed symbol edge area or the windowed symbol center area. - View Dependent Claims (2, 3, 4)
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5. A method for reducing data distortion received at a selective call receiver within a simulcast system, comprising the steps of:
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detecting a simulcast signal having a plurality of symbols each having a corresponding symbol center area and symbol edge area;
windowing the simulcast signal a fraction of a symbol time providing a windowed symbol area; and
clipping the windowed symbol area. - View Dependent Claims (6, 7)
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8. A method for reducing data distortion received at a selective call receiver within a simulcast system, comprising the steps of:
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detecting a simulcast signal having a plurality of symbols having corresponding symbol center areas and symbol edge areas;
windowing the symbol edge area in the simulcast signal providing a windowed symbol edge area; and
clipping the windowed symbol edge area. - View Dependent Claims (9, 10)
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11. A circuit for reducing data distortion received at a selective call receiver within a simulcast system, comprising:
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a detector for detecting a simulcast signal having a plurality of symbols having corresponding symbol center areas and symbol edge areas;
a filter for windowing the symbol edge area in the simulcast signal providing a windowed symbol edge area; and
a clipping circuit for clipping the windowed symbol edge area. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A selective call receiver unit capable of detecting a simulcast channel transmission, comprising
a selective call receiver; -
a demodulator coupled to the selective call receiver; and
a circuit coupled to the demodulator for reducing data distortion received at a selective call receiver within a simulcast system, comprising;
a detector for detecting a simulcast signal having a plurality of symbols having corresponding symbol center areas and symbol edge areas;
a filter for windowing the symbol edge area in the simulcast signal providing a windowed symbol edge area; and
a clipping circuit for clipping the windowed symbol edge area. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification