多輸入多輸出系統(tǒng)信道容量研究
On Channel Capacity of MIMO Systems
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摘要: 該文研究接收端采用均圓陣天線陣放置空間有限的條件下，存在相關(guān)衰落時(shí)MIMO系統(tǒng)的信道容量。建立了衰落相關(guān)模型，分析了散射角大小及天線數(shù)對(duì)信道容量的影響，采用隨機(jī)理論推導(dǎo)了MN的MIMO系統(tǒng)信道容量的閉式解。分析結(jié)果表明，MIMO系統(tǒng)信道容量主要由衰落相關(guān)矩陣的特征值決定。仿真結(jié)果表明，在接收端空間有限的情況下，天線數(shù)增大到一定程度時(shí)，信道容量達(dá)到飽和，再增加天線數(shù)，對(duì)信道容量的影響很小。
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關(guān)鍵詞:
- 移動(dòng)通信;MIMO;信道容量
Abstract: The paper studies the capacity of a Multiple Input Multiple Output (MIMO) system with correlated fading under the constrain of fixed space for the receiver UCA antennas. The fading correlation model is established and the impacts of the number of antennas and scattering angle on the channel system capacity are investigated. Based on the random theory, a closed-form expression for the channel capacity of an M by N MIMO system is derived. Analysis shows that the channel capacity of a MIMO system is mainly determined by eigenvalues of the fading correlated matrix. Simulation shows that the channel capacity is saturated when the number of antennas increases to a certain point. -
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