摘要
The paper mainly studies the sum-rate performance of limited feedback （LFB） block-diagonalization （BD） in multi-user distributed antenna system （DAS）. As the channel state information （CSI） fed back to base station （BS） is limited, multi-user interference （MUI） is caused inevitably because of the quantization error. Considering the influence of the MUI to the capacity of DAS, we propose a parameter of effective sum-rate ratio （ESRR） to denote the capacity offset under the condition of the BS can get perfect CSI and limited CSI first, then we confirm that the approximated ESRR is very close to actual ESRR got through simulations. After that, based on the approximated ESRR, an adaptive minimum bit feedback scheme which can effectively reduce the overhead of feedback channel and the complexity of the system is proposed. Simulation results show the effectiveness of the proposed scheme.
The paper mainly studies the sum-rate performance of limited feedback （LFB） block-diagonalization （BD） in multi-user distributed antenna system （DAS）. As the channel state information （CSI） fed back to base station （BS） is limited, multi-user interference （MUI） is caused inevitably because of the quantization error. Considering the influence of the MUI to the capacity of DAS, we propose a parameter of effective sum-rate ratio （ESRR） to denote the capacity offset under the condition of the BS can get perfect CSI and limited CSI first, then we confirm that the approximated ESRR is very close to actual ESRR got through simulations. After that, based on the approximated ESRR, an adaptive minimum bit feedback scheme which can effectively reduce the overhead of feedback channel and the complexity of the system is proposed. Simulation results show the effectiveness of the proposed scheme.
基金
supported by the National Natural Science Foundation of China(61271182)
the National Science Foundation for Young Scientists of China(61001115)
the Ministry of Industry and Information Technology of the People's Republic of China(2011ZX03001-007-03)
