Counter-Intermodulation Cancellation in Wireless Transmitters

The patent applies the principle of converting harm into benefit by using the counter-intermodulation products generated by the transmitter to create corresponding cancellation signals. The same non-linearity that produces harmful CIM products is exploited to generate equal and opposite cancellation components, which are then injected back into the transmission path to neutralize the original distortion. This transforms the harmful effect into a useful cancellation mechanism.

The patent introduces an intermediary signal processing stage that generates distortion cancellation signals. These cancellation signals act as intermediaries between the transmitter and the received signal, mediating the interaction to neutralize the counter-intermodulation products. The cancellation signals are processed through additional baseband and RF stages to create the appropriate cancellation components that counteract the original CIM products.

The patent implements feedback mechanisms where the distortion cancellation signals are generated based on monitoring and measurement of the actual counter-intermodulation products. The system continuously measures the CIM products, processes this information to generate appropriate cancellation signals, and injects them back into the transmission path. This closed-loop feedback approach enables automatic adaptation to varying transmission conditions and maintains optimal signal quality.

The patent applies self-service by having the transmitter system generate its own distortion cancellation signals using its inherent non-linearity. Rather than requiring external correction systems, the transmitter exploits its own counter-intermodulation products to create the cancellation signals needed to neutralize the distortion. This self-correcting mechanism reduces the need for separate, complex correction hardware.