The thesis examines the problem of joint receive and transmit beamforming for a wireless
network which consists of one relay node equipped with multiple antennas. The
transmitter and the receiver are single antenna systems. The communication system
consists of two phases. In the first phase the transmitter sends the information symbol
to the relay while in the second phase, the relay re-transmits a linearly transformed
version of the vector of its received signals. The concept of general-rank beamforming
is applied to this communication scheme for the case of the uplink (transmitter-relay)
and downlink (relay-receiver) channel vectors being statistically independent and statistically
dependent. In the general-rank beamforming approach, the multi-antenna
relay multiplies the received signal vector with a general-rank complex weight matrix
and re-transmits each entry of the output vector on the corresponding antenna. The
thesis presents a closed form solution to the general-rank beamforming power minimization
problem with proof that for statistically independent uplink and downlink
channels, the general-rank beamforming approach results in a rank-one solution for
the beamforming matrix. The simulation results have shown that when the generalrank
beamformer is applied to the case of statistically dependent uplink and downlink
channels, the general-rank beamforming technique significantly outperforms the separable
receive and transmit beamforming method. / UOIT
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OOSHDU.10155/66 |
| Date | 01 November 2009 |
| Creators | D'Souza, Olaf Manuel |
| Contributors | Grami, Ali, Shahbazpanahi, Shahram |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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