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基于動態(tài)反饋與功率分配的干擾對齊方法

李世寶,  賀昌,  劉建航,  王宜馨

李世寶, 賀昌, 劉建航, 王宜馨. 基于動態(tài)反饋與功率分配的干擾對齊方法[J]. 電子與信息學報, 2018, 40(3): 728-733. doi: 10.11999/JEIT170505
引用本文: 李世寶, 賀昌, 劉建航, 王宜馨. 基于動態(tài)反饋與功率分配的干擾對齊方法[J]. 電子與信息學報, 2018, 40(3): 728-733. doi: 10.11999/JEIT170505
LI Shibao, HE Chang, LIU Jianhang, WANG Yixin. Novel Interference Alignment Scheme Based on Dynamic Feedback and Power Allocation[J]. Journal of Electronics & Information Technology, 2018, 40(3): 728-733. doi: 10.11999/JEIT170505
Citation: LI Shibao, HE Chang, LIU Jianhang, WANG Yixin. Novel Interference Alignment Scheme Based on Dynamic Feedback and Power Allocation[J]. Journal of Electronics & Information Technology, 2018, 40(3): 728-733. doi: 10.11999/JEIT170505

基于動態(tài)反饋與功率分配的干擾對齊方法

doi: 10.11999/JEIT170505
基金項目: 

國家自然科學基金青年基金(61601519)，山東省自然科學基金(ZR2014FM017, ZR2016FL02)，中央高?；究蒲袠I(yè)務(wù)費專項資金資助項目(18CX02134A, 18CX02137A)

Novel Interference Alignment Scheme Based on Dynamic Feedback and Power Allocation

Funds: 

The National Natural Science Foundation of China (61601519), The Shandong Provincial Natural Science Foundation (ZR2014FM017, ZR2016FL02), The Fundamental Research Funds for the Central Universities (18CX02134A, 18CX02137A)

  • 摘要: 在多用戶MIMO系統(tǒng)中，信道狀態(tài)的精確性嚴重影響干擾對齊技術(shù)的性能。該文針對信道狀態(tài)信息(CSI)有限反饋導(dǎo)致的干擾泄露問題，提出一種基于動態(tài)反饋與功率分配的干擾對齊方法。首先從理論上分析了系統(tǒng)和速率與信道狀態(tài)反饋比特分配和功率分配之間的關(guān)系，得到了在動態(tài)反饋和功率分配條件下系統(tǒng)和速率的解析表達式；在此基礎(chǔ)上，以系統(tǒng)容量提升為目標，對反饋比特分配和功率分配優(yōu)化問題進行建模；并根據(jù)信道的準靜態(tài)特性利用庫恩塔克條件(KKT)對該問題進行求解，得到功率和反饋比特分配方案。仿真結(jié)果表明，與單獨考慮信道狀態(tài)動態(tài)反饋條件下的干擾對齊技術(shù)相比，提出的方法能夠有效減少干擾泄漏強度，提高系統(tǒng)和速率。
    Abstract: In multi-user MIMO systems, the accuracy of the Channel State Information (CSI) has a sufficient effect on performance of interference alignment scheme. To solve the problem of interference leakage caused by limited feedback of CSI, a novel method for interference alignment based on dynamic feedback and power allocation is proposed. First, the relationship between system sum rate and the allocation for channel state feedback bits and transmitting power is analyzed theoretically, and the formula of sum rate of the system considering dynamic feedback and power allocation is derived. Based on the above analysis, the model of optimizing allocation for feedback bits and power problem is set to improve the throughput of system. Then, a low-complexity solution to the problem is raised on the basis of channel quasi-static characteristic, and the feedback bit and power allocation scheme are obtained by the Karush-Kuhn-Tucker (KKT) condition. Simulation results show that the proposed method can effectively reduce the interference leakage and improve the system sum rate compared with the interference alignment scheme that just dynamically feedbacks channel state.
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出版歷程
  • 收稿日期:  2017-05-26
  • 修回日期:  2017-11-29
  • 刊出日期:  2018-03-19

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