Method and apparatus for reducing peak-to-average power ratio of a composite carrier signal
First Claim
1. A method of reducing peak-to-average power ratio of a composite signal formed from a plurality of signals coded by a plurality of assigned codes, the method comprising the steps of:
- producing a peak-reducing waveform coded with one or more codes which are orthogonal to said plurality of assigned codes, said step of producing including the steps of;
generating an estimate of said peak-reducing waveform; and
modifying said estimate of said peak-reducing waveform to be coded with one or more codes which are orthogonal to said plurality of assigned codes; and
summing said peak-reducing waveform to said composite signal to produce the composite signal having reduced peak-to-average power ratio.
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Accused Products
Abstract
A peak-reducing waveform is estimated and summed with a composite signal to reduce the peak-to-average power ratio of the composite signal. The estimate of the peak-reducing waveform is modified to have Walsh code components orthogonal to the assigned Walsh codes. An iterative process of estimating subsequent peak-reducing waveform is implemented to produce a peak-reducing waveform which, when summed with the composite signal, results in a composite signal having a peak-to-average ratio at a desired level and thus does not have the effects of remodulating the assigned Walsh codes. Constraints on the magnitude of the unassigned Walsh code components can be included for controlling the power level under the unassigned Walsh codes.
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Citations
19 Claims
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1. A method of reducing peak-to-average power ratio of a composite signal formed from a plurality of signals coded by a plurality of assigned codes, the method comprising the steps of:
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producing a peak-reducing waveform coded with one or more codes which are orthogonal to said plurality of assigned codes, said step of producing including the steps of; generating an estimate of said peak-reducing waveform; and modifying said estimate of said peak-reducing waveform to be coded with one or more codes which are orthogonal to said plurality of assigned codes; and summing said peak-reducing waveform to said composite signal to produce the composite signal having reduced peak-to-average power ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for reducing peak-to-average power ratio of a composite signal formed from a plurality of signals coded by a plurality of assigned codes, comprising:
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means for producing a peak-reducing waveform coded with one or more codes which are orthogonal to said plurality of assigned codes, wherein said means for producing includes; means for generating an estimate of said peak-reducing waveform; and means for modifying said estimate of said peak-reducing waveform to be coded with one or more codes which are orthogonal to said plurality of assigned codes; and a summer for summing said peak-reducing waveform to said composite signal to produce the composite signal having reduced peak-to-average power ratio. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification