Cost-effective linearization for wireless communication
One embodiment of the present invention provides a transceiver for wireless communication. The transceiver includes a transmitting circuit, a receiving circuit, a power amplifier coupled to the transmitting circuit, and a looping mechanism configured to establish a closed loop that couples an output of the power amplifier to an input of the receiving circuit in response to a linearity compensation need, thereby facilitating cost-effective linearity compensation.
1. A transceiver for wireless communication, comprising:
a transmitting circuit;
a receiving circuit;
a power amplifier coupled to the transmitting circuit;
a detector configured to detect an environmental change; and
a switching mechanism configured to, in response to the detected environmental change exceeding a predetermined threshold, switch an output of the power amplifier to couple to an input of the receiving circuit, thereby facilitating cost-effective linearity compensation.
2. The transceiver of claim 1 , wherein the transmitting circuit and the receiving circuit are located on a same integrated circuit (IC) chip.
3. The transceiver of claim 1 , further comprising an attenuator situated between the output of the power amplifier and the input of the receiving circuit.
4. The transceiver of claim 1 , wherein the detector is a temperature sensor.
5. The transceiver of claim 1 , further comprising a digital signal processor (DSP) configured to run a linearity-compensation algorithm based on a closed loop that includes the transmitting circuit, the power amplifier, and the receiving circuit.
6. The transceiver of claim 5 , wherein the DSP is further configured to generate a pre-distortion signal that can be used to pre-distort a baseband signal before the baseband signal is modulated by the transmitting circuit and amplified by the power amplifier.
7. A method for linearity compensation of a wireless transceiver that includes a transmitter, a receiver, and a power amplifier coupled to the transmitter, comprising:
detecting an environmental change;
receiving a linearity-compensation trigger signal in response to the detected environmental change exceeding a predetermined threshold;
in response to receiving the linearity-compensation trigger signal, forming a closed loop using the transmitter, the receiver, and the power amplifier, wherein the closed loop is configured to feed an output of the power amplifier to an input of the receiver; and
generating a pre-distortion signal that can be used to pre-distort a baseband signal before the baseband signal is modulated by the transmitter and amplified by the power amplifier, thereby enabling linearity compensation for the power amplifier.
8. The method of claim 7 , further comprising attenuating the output of the power amplifier.
9. The method of claim 7 , wherein the environmental change includes a temperature change.
10. The method of claim 7 , wherein generating the pre-distortion signal involves running a linearity-compensation algorithm based on the closed loop.