|
|
|
| Limited Feedback Precoding System Based on Hierarchical Codebook with Linear Receiver |
| Zhu Jun; Huang Yong-ming; Yang Lu-xi |
| School of Information Science and Engineering, Southeast University, Nanjing 210096, China |
|
|
|
|
Abstract The performance loss of conventional Grassmannian codebook is analyzed. According to the analysis of unitary perturbation’s effects on channel capacity as well as the BER, a novel hierarchical codebook consisting of a Grassmannian main-codebook and a perturbation subcodebook proposed for multi-antenna systems with linear receivers is established, and corresponds with the two-step codeword selection scheme that uses the product of two codewords respectively selected from the main-codebook and the sub one as the ultimate precoder. Specifically to the design of subcodebook, two schemes is brought forward: rotation-based and householder transformation-based, and the superiority of the proposed codebook in terms of both the channel capacity and BER is further confirmed by computer simulations.
|
|
Received: 10 October 2008
|
|
|
|
|
|
|
|
|
2009, Vol. 31 
