NLIC Input Selection Using DPD for Self-Jamming Cancellation
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Solution Overview
Problem
Self-jamming interference in wireless communication devices, caused by leakage of transmitted signals, degrades the performance of communication devices by affecting received signals, and existing technologies are inadequate in effectively mitigating this interference.
Innovation Solution
The implementation of a non-linear interference cancelation (NLIC) technique that uses a digital pre-distortion (DPD) unit to introduce distortions in the transmitted signal, allowing the communication device to select between a pre-DPD and post-DPD transmit signal based on the power of the transmitted signal to generate an effective cancelation signal, which is then used to mitigate self-jamming interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital pre-distortion (DPD) is applied to the transmitted signal, then the linearity of the transmitted signal is improved, but the complexity of the transmitter increases
Solution Approach 1:
The DPD unit applies pre-distortion to the transmit signal before transmission, introducing opposite distortions in advance to compensate for the non-linearities that will occur in the power amplifier. This preliminary action ensures that the final transmitted signal maintains linearity without requiring complex real-time correction mechanisms.
Solution Approach 2:
The DPD unit acts as an intermediary component between the signal source and the power amplifier, processing the signal to pre-compensate for expected non-linearities. This intermediary processing stage enables linearity improvement while keeping the overall system architecture manageable.
2Adaptability or versatility
If multiple NLIC signals are generated (pre-DPD and post-DPD), then the flexibility in interference cancelation is improved, but the computational complexity increases
Solution Approach 1:
The system dynamically selects between pre-DPD and post-DPD NLIC signals based on the actual power level of the transmitted signal. This dynamic adaptation allows the receiver to optimize interference cancelation performance for different operating conditions without requiring both signal types to be processed simultaneously, thereby managing computational complexity.
Solution Approach 2:
The selection of NLIC signal type is based on changes in the power parameter of the transmitted signal. By monitoring power levels and adapting the NLIC signal generation accordingly, the system achieves versatility in handling different transmission scenarios while avoiding unnecessary computational overhead.
3Reliability
If self-jamming interference is not mitigated, then the device operation is simple, but the received signal quality deteriorates
Solution Approach 1:
The system converts the harmful self-jamming interference into a useful component by generating NLIC signals that model the interference characteristics. These modeled interference signals are then subtracted from the received signal, effectively removing the harmful effect while utilizing information about the interference itself.
Solution Approach 2:
The NLIC process performs preliminary anti-action by generating and subtracting interference cancelation signals before the interference degrades the received signal quality. This proactive approach prevents the harmful effects of self-jamming from manifesting in the final received signal.
Data Source
AI summary
Self-jamming interference associated with a transmitted signal of an aggressor transmitter may affect a received signal of a victim receiver in a communication device. An aggressor transmitter may provide two or more non-linear interference cancelation (NLIC) signals, including a first NLIC signal and a second NLIC signal. A NLIC unit may reconstruct an interference signal based on a selected one of the first NLIC signal or second NLIC signal. Power of the transmitted signal at the aggressor transmitter may be used to select either the first interference cancelation signal or the second interference cancelation signal. The first and second NLIC signals may differ by the use of digital pre-distortion (DPD) at the aggressor transmitter.