Receiver desensitization in Envelope Tracking PA based FDD LTE transceivers

This paper analyses the issue of receiver desensitization, due to the interaction with the transmitter in Envelope Tracking (ET) based FDD transceivers. The purpose of the study is to assess the possible trade-offs between the several system parameters, the implementation constraints and the system performance. The data reported in the paper consider an accurate model of the ET-PA obtained by a previous research, and a combination of data-flow and envelope simulations. The test signal adopted as case study is a legacy LTE10 for up-link user equipments. The paper shows that a best trade-off between the DAC ENOB in the envelope modulation path, and the shaping function discretization, consists respectively in 9 bit and 2^6 byte.