Analog Interference Cancellation for Full-Duplex Broadband Power Line Communications

In this seminar, an all-analog echo cancellation solution to achieve in-band full-duplex (IBFD) operation in broadband power line communications (BB-PLC) is presented. The performance of active digital interference cancellation, as proposed previously for IBFD BB-PLC, is limited by distortion and quantization noise introduced by the analog-to-digital converter (ADC). Hence, analog interference cancellation (AIC) solutions to reduce the power of the signal entering the ADC are explored. Various AIC solutions for other communication media known from the literature are considered, and it is shown that a direct implementation of any of these solutions to a BB-PLC system renders an expensive and/or ineffective realization. Acknowledging the specific challenges encountered in BB-PLC, a novel AIC mechanism is presented that not only eliminates the effects of ADC distortion and quantization noise, but also provides sufficient echo cancellation gain (ECG) to function without an active digital interference cancellation module. Through simulation results, it is demonstrated that the proposed solution provides over 80 dB of ECG, which is sufficient to reduce the echo power down to the minimum power line noise floor.