Linearization for a single power amplifier in a multi-band transmitter
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsSai Mohan Kilambi, Bradley John Morris
Life of this patent
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Abstract
A multi-band signal is generated by combining two or more input signals separated in frequency. The input signals are combined either before or after predistortion depending on the bandwidth of the multi-band signal. If the bandwidth of the multi-band signal is less than a predetermined bandwidth threshold, the input signals are combined and predistortion is applied to the combined signal to generate the multi-band signal. If the bandwidth of the multi-band signal is greater than the bandwidth threshold, the individual input signals are predistorted and subsequently combined to generate the multi-band signal.
Claims32
A method of transmitting a multi-band output signal, said method comprising:
- determining a bandwidth of a composite signal comprising two or more input signals to be transmitted on different frequency bands;
- comparing the bandwidth of the composite signal to a bandwidth threshold;
- if the bandwidth of the composite signal is greater than the bandwidth threshold, generating a multi-band signal by predistorting at least one of the individual input signals before combining with the other input signals;
- if the bandwidth of the composite signal is less than the bandwidth threshold, generating a multi-band signal by predistorting the composite signal;
- and
- amplifying the multi-band signal to generate the multi-band output signal for transmission over a wireless channel.
A transmitter for transmitting a multi-band signal comprising two or more input signals separated in frequency, said transmitter comprising:
- a configurable transmit circuit to generate a multi-band signal from two or more input signals to be transmitted on different frequency bands, said transmit circuit comprising:
- a plurality of predistorters;
- one or more combiners to selectively combine two or input signals before predistortion depending on a bandwidth of a composite signal including the two or more input signals;
- and
- an amplifier to amplify the multi-band signal to generate the multi-band output signal;
- and
- a selection circuit to selectively configure the transmit circuit to:
- generate a multi-band signal by predistorting one or more input signals individually in component predistorters when the bandwidth of the composite signal is greater than a predetermined bandwidth threshold;
- and
- generate a multi-band signal by predistorting the composite signal when the bandwidth of the composite is greater than a predetermined bandwidth threshold.
Dependencies are inferred from the claim text.