(i) Explain the frequency division duplexing (FDD) and time division duplexing (TDD). In which of these two duplexing based systems, will the uplink channel and the downlink channel be reciprocal? Explain why. (ii) With FDD or TDD, a mobile user requires two resource blocks (two frequency slots or two time slots) to achieve full duplexing, namely, one resource block for transmitting and the other for receiving. Name the duplexing scheme that is capable of achieving full duplexing with only single resource block. Explain how this full duplexing scheme works with the aid of a system block diagram