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US 2003/0012289 A1Published application
Controlled modulation distortion
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorBengt Lindoff
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Abstract
The frequency bandwidth of a signal is reduced, while retaining the desired signal information, by selectively introducing a controlled distortion to an IQ baseband signal. The technique is applicable to both IQ-modulators and polar modulators, thereby allowing cost-efficient and current-efficient polar modulators and/or cost-efficient power amplifiers to be utilized.
Claims26
A method of generating a radio frequency signal that represents a sequence of information bits, the method comprising:
- generating a resultant baseband signal by selectively generating either a non-distorted complex-valued baseband signal or a distorted complex-valued baseband signal, wherein selective generation is based upon values of information bits in the sequence of information bits;
- and
- generating the radio frequency signal from the resultant baseband signal,
- wherein for any given sequence of information bits represented by the distorted complex-valued baseband signal, the distorted complex-valued baseband signal deviates from a reference baseband signal corresponding to the given sequence of information bits.
1 more element
An apparatus for generating a radio frequency signal, comprising:
- logic that generates a resultant baseband signal by selectively generating either a non-distorted complex-valued baseband signal or a distorted complex-valued baseband signal, wherein selective generation is based upon values of information bits in the sequence of information bits;
- and
- logic that generates the radio frequency signal from the resultant baseband signal,
- wherein for any given sequence of information bits represented by the distorted complex-valued baseband signal, the distorted complex-valued baseband signal deviates from a reference baseband signal corresponding to the given sequence of information bits.
1 more element
Dependencies are inferred from the claim text.