Today's demands on wireless ad hoc and peer-to-peer communications have
motivated a variety of relay-assisted wireless network configurations, such as
networks with single or multiple relay(s), source(s) and destination(s), as
well as unidirectional and bidirectional communications. We are particularly
interested in two scenarios: (1) When there are plenty of relay nodes such
that one source-destination pair is assisted by parallel relay channels. In
this scenario, we proposed the distributed relay selection and power
allocation algorithms. (2) When there are many users wishing to exchange
information and potentially having to share intermediate relay(s). In this
scenario, when CDMA is employed, we designed the multiuser two-way relaying
scheme allowing each pair of partners share a common spreading signature,
solved the interference management problem by constructing the iterative power
control and receiver updates that converge to the corresponding unique
optimum, and achieved significant power savings and user capacity improvement;
when orthogonal channels are available for each user pair, we investigated the 
optimum relay power allocation problem for various relay forwarding mechanisms 
to maximize the arbitrary weighted sum rate of all users.