Telecommunications – Transmitter – Plural separate transmitters or channels
Patent
1995-12-21
1999-01-19
Faile, Andrew I.
Telecommunications
Transmitter
Plural separate transmitters or channels
455115, 455127, H04B 102, H04B 104
Patent
active
058624570
ABSTRACT:
A multiplicity of baseband input signals are supplied to a signal processor which functions to modify the input signals such that when the modified signals modulate corresponding multiple carrier wave signals which are combined to produce a composite signal which is applied to the input of an amplifier, the "peaking" at the input to the amplifier and the resultant intermodulation at the output of the amplifier are reduced. In response to the application of the baseband input signals, the signal processor determines the extent of peaking and modifies at least one of the phase and amplitude of the input signals. In one embodiment of the invention, a block of data representing the input signals over a time slot is supplied to the signal processor which then generates a fixed phase shift over the time slot. In another embodiment of the invention, a block of data representing input signals is applied to a signal processor which then determines the worst case peaking and the time of their occurrence. The signal processor then generates phase shifts which change very gradually, thereby reducing sharp peaking at the input to the amplifier at selected times without significantly distorting the signal.
REFERENCES:
patent: 4698597 (1987-10-01), Merli et al.
patent: 4991212 (1991-02-01), Foti
patent: 5045799 (1991-09-01), Holecek
patent: 5125100 (1992-06-01), Katznelson
patent: 5524286 (1996-06-01), Chiesa et al.
Faile Andrew I.
Lucent Technologies - Inc.
Onuaku Christopher
Schanzer Henry I.
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