Method and apparatus for reducing transmitter peak power requirements using dual matrices
First Claim
1. An apparatus for processing base band signals to reduce peak power requirements for a multi-channel transmitter, the apparatus comprising in combination:
- a first Fourier Transform Matrix (FTM) coupled to at least one input signal for providing a plurality of output signals each comprising a combination of phase shifted versions of said at least one input signal;
a processing unit coupled to said output signals for limiting a peak value for each of said output signals to provide a plurality of peak limited output signals, and a second FTM coupled to said peak limited output signals for decomposing said peak limited output signals to provide a plurality of output base band signals suitable for generating a plurality of low level signals for driving the multi-channel transmitter, each of said output base band signals corresponding to one of said input signals.
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Abstract
An apparatus and method thereof for processing base band signals to reduce peak power requirements for a multi-channel transmitter is disclosed. The apparatus includes a first Fourier Transform Matrix (FTM) coupled to one or more input signals for providing a plurality of output signals each comprising a combination of phase shifted versions of the input signals; a processing unit for limiting a peak value for each of the output signals to provide a plurality of peak limited output signals, and a second FTM for decomposing the peak limited output signals to provide one or more output base band signals suitable for generating one or more low level signals for driving the multi-channel transmitter, each of the output base band signals corresponding to one of the input signals. A multi-channel transmitter further converts the output base band signals to a radio frequency signals; a first analog FTM provides a plurality of amplifier input signals; a power amplifier having a plurality of amplifiers provides a plurality of amplified output signals; and a second analog FTM coupled to the amplified output signals provides transmit signals corresponding one to one with the output base band signals.
110 Citations
26 Claims
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1. An apparatus for processing base band signals to reduce peak power requirements for a multi-channel transmitter, the apparatus comprising in combination:
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a first Fourier Transform Matrix (FTM) coupled to at least one input signal for providing a plurality of output signals each comprising a combination of phase shifted versions of said at least one input signal;
a processing unit coupled to said output signals for limiting a peak value for each of said output signals to provide a plurality of peak limited output signals, and a second FTM coupled to said peak limited output signals for decomposing said peak limited output signals to provide a plurality of output base band signals suitable for generating a plurality of low level signals for driving the multi-channel transmitter, each of said output base band signals corresponding to one of said input signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multi-channel transmitter having reduced peak power requirements comprising in combination:
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an apparatus for processing base band signals to reduce peak to average parameters for said base band signals, the apparatus further comprising;
a first Fourier Transform Matrix (FTM) for providing a plurality of FTM output signals each comprising a combination of phase shifted versions of at least one input signals;
a processing unit for limiting a peak value for each of said FTM output signals to provide a plurality of peak limited output signals, and a second FTM for decomposing said peak limited output signals to provide at least one output base band signals, each of said at least one output base band signals corresponding to one of said at least one input signals;
a mixer for converting each of said at least one output base band signals to a radio frequency signal to provide at least one radio frequency signals;
a first analog FTM for providing a plurality of amplifier input signals, each comprising a combination of phase shifted versions of said at least one radio frequency signals;
a power amplifier having a plurality of amplifiers to provide a plurality of amplified output signals, each amplifier having an input coupled to one of said plurality of said amplifier input signals and providing one of said plurality of said amplified output signals; and
a second analog FTM coupled to said plurality of amplified output signals to provide at least one transmit signals corresponding one to one with said at least one output base band signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of reducing peak power requirements in a multi-channel transmitter, the method including the steps of:
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providing a plurality of output signals each comprising a combination of phase shifted versions of at least one input signals;
limiting a peak value for each of said output signals to provide a plurality of peak limited output signals, decomposing said peak limited output signals to provide at least one output base band signals, each of said at least one output base band signals corresponding to one of said at least one input signals;
converting each of said at least one output base band signals to a radio frequency signal to provide at least one radio frequency signals;
generating a plurality of amplifier input signals, each comprising a combination of phase shifted versions of said at least one radio frequency signals, said amplifier input signals corresponding to said peak limited output signals;
amplifying said plurality of said amplifier signals to provide a plurality of amplified output signals using a power amplifier having a plurality of amplifiers, each amplifier having an input coupled to one of said plurality of said radio frequency signals and providing one of said plurality of said amplified output signals; and
decomposing said plurality of said amplified output signals to provide at least one transmit signals corresponding one to one with said at least one output base band signals. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification