基于泊松點過程分布的多蜂窩協(xié)作系統(tǒng)中干擾對齊技術(shù)研究
doi: 10.11999/JEIT140986 cstr: 32379.14.JEIT140986
基金項目:
國家自然科學(xué)基金(61401165, 61372101, 61271018)，國家科技重大專項(2012ZX03004-005-003, 2011ZX03003-003-03)，中國博士后科學(xué)基金(2013M541588)，江蘇省科技計劃(BE2012167, BK2011019)和教育部博士點新教師基金(20100092110010)資助課題
Research on Interference Alignment Technique in Multi-cell Cooperative Systems Based on Poisson Point Process
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摘要: 在多蜂窩MIMO(Multiple-Input Multiple-Output)協(xié)作通信系統(tǒng)中，該文研究了基站站點服從泊松點過程(PPP)分布時，協(xié)作基站(BSs)和用戶對采用干擾對齊技術(shù)的中斷概率和網(wǎng)絡(luò)吞吐量性能，推導(dǎo)了完全信道狀態(tài)信息(CSI)和部分CSI兩種情況下的上述性能的解析表達式，并分析了系統(tǒng)性能與協(xié)作參數(shù)的單調(diào)關(guān)系。仿真分析發(fā)現(xiàn)：在完全CSI情況下，網(wǎng)絡(luò)吞吐量隨著基站密度、協(xié)作基站數(shù)、天線數(shù)的增加而增加；在部分CSI情況下，由于綜合考慮了信道訓(xùn)練和有限反饋帶來的資源開銷以及量化CSI引入的信道失真，存在一個使網(wǎng)絡(luò)吞吐量最大的最優(yōu)協(xié)作基站數(shù)，當天線數(shù)較少或用戶移動速度較小時，應(yīng)有較多的基站參與協(xié)作，當天線數(shù)較多或用戶移動速度較大時，應(yīng)適當減少協(xié)作基站數(shù)。
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關(guān)鍵詞:
- 多蜂窩協(xié)作系統(tǒng) /
- 干擾對齊 /
- 泊松點過程分布 /
- 中斷概率 /
- 網(wǎng)絡(luò)吞吐量
Abstract: In the multi-cell MIMO (Multiple-Input Multiple-Output) cooperative communication system, the performances of outage probability and network throughput of interference alignment applied by the cooperative Base Stations (BSs) and users are investigated when the locations of the BSs follow Poisson Point Process (PPP) distribution, and the analytical expressions of the above performances are derived under the conditions of perfect Channel State Information (CSI) and imperfect CSI, respectively. The monotonic relationships between the system performances and the cooperation parameters are also analyzed. The simulation analyses reveal that, under the condition of perfect CSI, the network throughput improves with the increase of BS density, the number of cooperative BSs and the number of antennas; under the condition of imperfect CSI, considering both the resource overhead of channel training and limited feedback and the channel distortion induced by quantized CSI, there exists an optimal number of BSs which can maximize the network throughput. When the number of antenna is small or the velocity of mobile user is not so high, more BSs are expected to participate into the cooperation, and when the number of antenna or the velocity of mobile user is large, the number of cooperative BSs should be appropriately reduced. -
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