Seminar: Graduate Seminar
An All-Digital Cancellation Flow for Mitigating TX Noise, Cross-Modulation, and IP2 Distortion in a Balanced N-Path FDD Transceiver
Date:
November,16,2025
Start Time:
14:30 - 15:30
Location:
1061, Meyer Building
Add to:
Lecturer:
Avi Lax
Research Areas:
| The extended use of frequency division duplex (FDD) in modern wireless communications systems offers significant advantages, such as reduced latency and efficient spectrum utilization. However, it also necessitates robust solutions for managing the inherent self-interference caused by simultaneous transmit (TX) and receive (RX) operations. A fundamental challenge in FDD systems is the impact of the strong TX signal leaking at the RX chain, which can saturate the receiver and significantly increase its noise floor. This degradation is caused by several factors, including high TX noise in the RX band, TX-RX cross-modulation (CM) distortion and second-order intermodulation (IP2) products, and reciprocal mixing (RM) with the receiver local oscillator (LO) phase noise. A conventional solution for FDD system is an external diplexer, which is costly, bulky, and non-tunable. The research overcomes those FDD challenges by using an all-digital self-interference cancellation (SIC) which was tested on a fully integrated filter less FDD transceiver. The proposed set of algorithms targets both linear and nonlinear self-interference cancellation. We use time-synchronized and least squares (LS) estimation, which successfully suppressed these distortion terms to the noise floor with less than 1 dB noise figure penalty without destroying the desired signal’s EVM. M.Sc. student under the supervision of Prof. Emanuel Cohen.
|