Electrical balance duplexing enables simultaneous transmit and receive from a single antenna, however the transmit-to-receive isolation depends on the ability of the balancing algorithm to determine the correct balancing impedance. A novel balancing algorithm based on in-situ characterization of the duplexer self-interference channel is proposed. The algorithm requires no a-priori knowledge of the antenna impedance or hybrid junction characteristics, and automatically compensates for circuit imperfections. novel balancing network implementation which uses active signal injection is also proposed. A hardware prototype implementing the proposed balancing algorithm and combining passive and active balancing techniques has achieved 81.5dB isolation over an 80MHz bandwidth.
|Number of pages||5|
|Journal||IEEE Transactions on Circuits and Systems II: Express Briefs|
|Early online date||25 Sep 2015|
|Publication status||Published - Jan 2016|
- Electrical Balance Duplexer
- Self-interference cancellation
- 5G enabling technologies