In FDD amplify-and-forward distributed relay network, codebook techniques are utilized
to feedback quantized CSI with limited cost. First, this thesis focuses on the phaseonly
codebook and with-power-control codebook design methods under individual relay
power constraints. Phase-only codebooks can be generated off-line with the Grassmannian
beamforming criterion. Due to non-uniform distribution of the optimal beamforming vector
in the vector space, The Lloyd’s algorithm is proposed for with-power-control codebook
designs. To reduce search complexity, a suboptimal method for the codebook update stage
in the Lloyd’s algorithm is proposed. Its performance is compared to the performance of
the global search method which provides the optimal solution but incurs high computation
complexity. Second, this thesis investigates the performance difference between phaseonly
and with-power-control codebooks. It is found that the power control gain is tightly
related to the relay locations. When the relays are close to the source node, the gain from
power control is negligible and using phase-only codebooks becomes a viable choice for
feedback due to its simple implantation and off-line computation. Finally, the problem of
codebook design extends to the total relay power constraint case, and the Lloyd’s algorithm
with primary eigenvector method is proposed to design a suboptimal codebook. / UOIT
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OOSHDU.10155/221 |
| Date | 01 April 2012 |
| Creators | Zheng, Min |
| Contributors | Dong, Min |
| 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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