Single-chip digital pre-distortion (DPD) device implemented using radio frequency transceiver integrated circuit with integrated DPD function
One embodiment is directed to a system that comprises a non-DPD RF transceiver circuit that does not include digital pre-distortion (DPD) functionality and a DPD RF transceiver integrated circuit that includes DPD functionality. A first analog RF transmit signal output by the non-DPD RF transceiver circuit is received by a receive signal path of the DPD RF transceiver integrated circuit so that receive baseband data generated by the receive signal path is indicative of the first analog RF transmit signal. The receive baseband data generated by the DPD RF transceiver integrated circuit is received by a transmit signal path of the DPD RF transceiver integrated circuit. A second analog RF transmit signal output by the transmit signal path is a digitally pre-distorted version of the first analog RF transmit signal for amplification by the power amplifier.
1. A system for performing digital pre-distortion (DPD) for a first analog radio frequency (RF) transmit signal and a power amplifier, the system comprising:
a non-DPD RF transceiver circuit that does not include DPD functionality, the non-DPD RF transceiver circuit configured to output the first analog RF transmit signal; and
a DPD RF transceiver integrated circuit comprising:
a transmit signal path configured to output a second analog RF transmit signal generated from transmit baseband data input to the transmit signal path, wherein the transmit signal patch comprises integrated DPD functionality; and
a receive signal path configured to output receive baseband data generated from an analog RF receive signal input to the receive signal path;
wherein the system is configured so that the first analog RF transmit signal output by the non-DPD RF transceiver circuit is received by the receive signal path of the DPD RF transceiver integrated circuit so that the receive baseband data generated by the receive signal path is indicative of the first analog RF transmit signal; and
wherein the system is configured so that the receive baseband data generated by the DPD RF transceiver integrated circuit is received by the transmit signal path of the DPD RF transceiver integrated circuit, wherein the second analog RF transmit signal output by the transmit signal path is a digitally pre-distorted version of the first analog RF transmit signal for amplification by the power amplifier.
2. The system of claim 1 , wherein the DPD functionality uses observation baseband data generated from a coupled version of an amplified analog RF signal output by the power amplifier that is received by the transmit signal path.
3. The system of claim 2 , wherein the coupled version of the amplified analog RF signal output by the power amplifier is input to the transmit signal path via an RF coupler coupled to an output of the power amplifier.
4. The system of claim 1 , wherein the non-DPD RF transceiver circuit comprises a digital transceiver circuit that generates the first analog RF transmit signal from digital baseband input data.
5. The system of claim 1 , wherein the non-DPD RF transceiver circuit comprises an analog RF transceiver circuit that generates the first analog RF transmit signal from an analog input signal.
6. The system of claim 1 , wherein the DPD RF transceiver integrated circuit further comprising:
an analog receive port coupled to the receive signal path;
a receive serial interface coupled to the receive signal path;
a transmit serial interface coupled to the transmit signal path;
an analog transmit port coupled to the transmit signal path; and
an observation port coupled to the transmit signal path;
wherein the analog RF transmit signal is coupled to the analog RF receive port so that the analog RF transmit signal is received on the analog RF receive port of the DPD RF transceiver integrated circuit and so that receive baseband data output via the receive serial interface is indicative of the analog RF transmit signal; and
wherein the receive serial interface is coupled to the transmit serial interface so that the DPD functionality performs DPD on the receive baseband data using observation baseband data generated from a coupled version of an amplified analog RF signal output by the power amplifier that is received via the observation port and so that a digitally pre-distorted version of the analog RF transmit signal is output on the analog transit port for amplification by the power amplifier.
7. The system of claim 1 , wherein the system is configured so that the receive baseband data generated by the DPD RF transceiver integrated circuit is received by the transmit signal path of the DPD RF transceiver integrated circuit by looping back the receive baseband data generated by the DPD RF transceiver integrated circuit to the transmit signal path of the DPD RF transceiver integrated circuit within the DPD RF transceiver integrated circuit.
8. The system of claim 1 , wherein the system comprises the power amplifier.
9. The system of claim 1 , wherein the DPD RF transceiver integrated circuit further includes at least one of:
crest factor reduction (CFR) functionality;
inverse fast Fourier transform (iFFT) functionality;
digital up conversion (DUC) functionality;
digital down conversion (DDC) functionality; and
fast Fourier transform (FFT) functionality.
10. The system of claim 1 , wherein the DPD RF transceiver integrated circuit comprises a dual-channel DPD RF transceiver integrated circuit.
11. The system of claim 1 , wherein the system comprises at least one of a repeater system, a base station, and a relay node.
12. The system of claim 1 , wherein the system comprises a distributed antenna system (DAS).
13. The system of claim 12 , wherein the DAS comprises at least one of a digital DAS and an analog DAS.
14. The system of claim 12 , wherein the DAS comprises at least one remote antenna unit, wherein the at least one remote antenna unit comprises the non-DPD RF transceiver circuit and the DPD RF transceiver integrated circuit.
15. The system of claim 1 , wherein the system comprises a single-node repeater.
16. The system of claim 15 , wherein the single-node repeater comprises at least one of an analog single-node repeater and a digital single-node repeater.
17. The system of claim 15 , wherein the non-DPD RF transceiver circuit comprises a donor non-DPD RF transceiver circuit and a coverage non-DPD RF transceiver circuit configured to output a first donor analog RF transmit signal and a first coverage analog RF transmit signal, respectively, the donor non-DPD RF transceiver circuit and the coverage non-DPD RF transceiver circuit not including DPD functionality;
wherein the DPD RF transceiver integrated circuit comprises a coverage DPD RF transceiver integrated circuit and a donor DPD RF transceiver integrated circuit, each of which comprises a respective transmit signal path and a respective receive signal path;
wherein the power amplifier comprises a donor power amplifier and a coverage power amplifier;
wherein the single-node repeater is configured so that the first donor analog RF transmit signal output by the donor non-DPD RF transceiver circuit is received by the receive signal path of the donor DPD RF transceiver integrated circuit so that the receive baseband data generated by the receive signal path of the donor DPD RF transceiver integrated circuit is indicative of the donor analog RF transmit signal; and
wherein the single-node repeater is configured so that the receive baseband data generated by the donor DPD RF transceiver integrated circuit is received by the transmit signal path of the donor DPD RF transceiver integrated circuit, wherein the second donor analog RF transmit signal output by the transmit signal path of the donor DPD RF transceiver integrated circuit is a digitally pre-distorted version of the first analog RF transmit signal for amplification by the donor power amplifier;
wherein the single-node repeater is configured so that the first coverage analog RF transmit signal output by the coverage non-DPD RF transceiver circuit is received by the receive signal path of the coverage DPD RF transceiver integrated circuit so that the receive baseband data generated by the receive signal path of the coverage DPD RF transceiver integrated circuit is indicative of the coverage analog RF transmit signal; and
wherein the single-node repeater is configured so that the receive baseband data generated by the coverage DPD RF transceiver integrated circuit is received by the transmit signal path of the coverage DPD RF transceiver integrated circuit, wherein the second coverage analog RF transmit signal output by the transmit signal path of the coverage DPD RF transceiver integrated circuit is a digitally pre-distorted version of the first analog RF transmit signal for amplification by the coverage power amplifier.
18. A method of performing digital pre-distortion (DPD) for a first analog radio frequency (RF) transmit signal and a power amplifier, the method comprising:
receiving, by a receive signal path of a DPD RF transceiver integrated circuit that includes integrated DPD functionality, the first analog RF transmit signal output by a non-DPD RF transceiver circuit that does not include DPD functionality;
generating, by the DPD RF transceiver integrated circuit, receive baseband data indicative of the first analog RF transmit signal;
receiving the receive baseband data by a transmit signal path of the DPD RF transceiver integrated circuit; and
generating and outputting, by the transmit signal path, a second analog RF transmit signal generated from the transmit baseband data, wherein the second analog RF transmit signal output by the transmit signal path is a digitally pre-distorted version of the first analog RF transmit signal for amplification by the power amplifier.
19. The method of claim 18 , further comprising:
receiving, by the transmit signal path, observation baseband data generated from a coupled version of an amplified analog RF signal output by the power amplifier, wherein the observation baseband data is used in performing DPD.
20. The method of claim 18 , further comprising:
performing crest factor reduction (CFR) for the first analog RF transmit signal using CFR functionality included in the DPD RF transceiver integrated circuit.
21. The method of claim 18 , wherein the method is performed in at least one of a repeater system, a base station, a relay node, and an analog power amplifier.
22. The method of claim 18 , wherein receiving the receive baseband data by the transmit signal path of the DPD RF transceiver integrated circuit comprises:
outputting the receive baseband from the receive signal path of the DPD RF transceiver integrated circuit on a receive serial interface coupled to the receive signal path; and
receiving the receive baseband data by the transmit signal path of the DPD RF transceiver integrated circuit on a transmit serial interface coupled to the transmit signal path.
23. The method of claim 18 , wherein receiving the receive baseband data by the transmit signal path of the DPD RF transceiver integrated circuit comprises:
looping back the receive baseband data generated by the DPD RF transceiver integrated circuit to the transmit signal path of the DPD RF transceiver integrated circuit within the DPD RF transceiver integrated circuit.
24. The method of claim 18 , wherein the DPD RF transceiver integrated circuit comprises a baseband processing module that is configured to implement at least one of:
digital pre-distortion (DPD) functionality;
crest factor reduction (CFR) functionality;
inverse fast Fourier transform (iFFT) functionality;
digital up conversion (DUC) functionality;
digital down conversion (DDC) functionality; and
fast Fourier transform (FFT) functionality.