Real-Time Digital Predistortion with Reduced Feedback Complexity for Millimeter-Wave Phased Array in Handset Applications

This paper presents a real-time digital predistortion with reduced feedback complexity in handset application. The method utilizes the mutual coupling between antenna elements and employs both of the coupling and isolation ports of couplers for feedback, thereby reducing the overall number of couplers required. A new basic function is introduced to mitigate the effects of coupling channel. The measured results show that the proposed method can effectively realize the linearization for the millimeter-wave phased array, proving the feasibility in handset application.