Full-duplex wireless communication networks need to deal with echo signals in order to obtain good performance, which could be achieved by using an echo canceller. By using multiple transmitters and receivers to relay the desired signal, dynamic ranges are reduced. This improvement will allow echo cancellation be effective. In this thesis, a single antenna, low-power full-duplex communication network architecture that is enabled to be used in a co-operative communication network is proposed. In addition to co-operative communication and echo cancellation, spread spectrum is also used to obtain high robustness against noise and interference. This network architecture is expected to work in 5.775 GHz ISM band with a 150 MHz bandwidth, with the requirement that spreading sequences for the proposed system must have both good autocorrelation and cross correlation properties. In regards to the above requirement, Gold sequences exhibit the best performance comparing to Frank-Heimiller sequences and m sequences. This network architecture is originally designed for an urban residential network. However, it could be applied to different fields and combined with different technologies.
This research was supported by the University of New Brunswick,