Software adaptable high performance multicarrier transmission protocol
First Claim
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1. A CI transmission system employing PAPR-reduction signaling, the CI transmission system including:
- a symbol-mapping module adapted to allocate a predetermined number of data bits to a predetermined set of subchannels, a CI coder adapted to perform at least one predetermined combination of data spreading and channel coding to produce a plurality of input symbols, a carrier-generator module adapted to associate the input symbols with at least one set of subchannels and generate a corresponding time-domain sequence representing a data-payload signal, and an unloaded channel-encoding module adapted to select unloaded subchannels for transmission of at least one PAPR-reduction signal.
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Abstract
Techniques for reducing peak-to-average power in multicarrier transmitters employ peak cancellation with subcarriers that are impaired by existing channel conditions. The use of Carrier Interferometry (CI) coding further improves the effectiveness of peak reduction. CI coding can also be impressed onto pulse sequences in the time domain, which enhances spectral selection and facilitates peak-power control.
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Citations
13 Claims
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1. A CI transmission system employing PAPR-reduction signaling, the CI transmission system including:
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a symbol-mapping module adapted to allocate a predetermined number of data bits to a predetermined set of subchannels, a CI coder adapted to perform at least one predetermined combination of data spreading and channel coding to produce a plurality of input symbols, a carrier-generator module adapted to associate the input symbols with at least one set of subchannels and generate a corresponding time-domain sequence representing a data-payload signal, and an unloaded channel-encoding module adapted to select unloaded subchannels for transmission of at least one PAPR-reduction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multicarrier transmission system adapted to reduce the effects of high PAPR including:
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a CI coder adapted to spread at least one data sequence with at least one set of CI codes for generating at least one set of Cl-coded symbols, a sub-carrier generator adapted to map the at least one set of CI-coded symbols onto a plurality of subcarriers, a plurality of combiners adapted to combine sets of the plurality of carriers for producing a plurality of Cl-coded time-domain sequences that are characterized by low PAPR, and a plurality of power amplifiers coupled to the plurality of combiners, the amplifiers adapted to amplify the plurality of CI-coded time-domain sequences. - View Dependent Claims (11, 12)
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13. A multicarrier signal generator including:
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a pulse-train generator adapted to generate a sequence of pulse waveforms having a predetermined spectrum, a CI coder capable of generating at least one CI code, and a carrier selector coupled to the CI coder and the pulse-train generator, the carrier selector adapted to impress the at least one CI code onto the sequence of pulse waveforms to shape the predetermined spectrum.
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Specification