基于動(dòng)態(tài)反饋與功率分配的干擾對(duì)齊方法

李世寶; 賀昌; 劉建航; 王宜馨

doi:10.11999/JEIT170505

基于動(dòng)態(tài)反饋與功率分配的干擾對(duì)齊方法

doi: 10.11999/JEIT170505 cstr: 32379.14.JEIT170505

基金項(xiàng)目:

國(guó)家自然科學(xué)基金青年基金(61601519)，山東省自然科學(xué)基金(ZR2014FM017, ZR2016FL02)，中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(18CX02134A, 18CX02137A)

計(jì)量
- 文章訪問(wèn)數(shù): 1264
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- 被引次數(shù): 0
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

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

摘要: 在多用戶MIMO系統(tǒng)中，信道狀態(tài)的精確性嚴(yán)重影響干擾對(duì)齊技術(shù)的性能。該文針對(duì)信道狀態(tài)信息(CSI)有限反饋導(dǎo)致的干擾泄露問(wèn)題，提出一種基于動(dòng)態(tài)反饋與功率分配的干擾對(duì)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(dòng)態(tài)反饋和功率分配條件下系統(tǒng)和速率的解析表達(dá)式；在此基礎(chǔ)上，以系統(tǒng)容量提升為目標(biāo)，對(duì)反饋比特分配和功率分配優(yōu)化問(wèn)題進(jìn)行建模；并根據(jù)信道的準(zhǔn)靜態(tài)特性利用庫(kù)恩塔克條件(KKT)對(duì)該問(wèn)題進(jìn)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(dú)考慮信道狀態(tài)動(dòng)態(tài)反饋條件下的干擾對(duì)齊技術(shù)相比，提出的方法能夠有效減少干擾泄漏強(qiáng)度，提高系統(tǒng)和速率。
- MIMO /
- 干擾對(duì)齊 /
- 有限反饋 /
- 動(dòng)態(tài)反饋 /
- 功率分配
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.
- MIMO /
- Interference alignment /
- Limited feedback /
- Dynamic feedback /
- Power allocation

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參考文獻(xiàn)(20)

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