On degrees of freedom of the cellular network

In this paper, we consider the capacity limits of the cellular network by modeling it as consisting of two mutually interfering multiple access channels with multiple antennas at each receiver （e.g., base station）. By developing a tight outerbound as well as an achievable scheme which exploits the i...

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Bibliographic Details
Published in:Science China. Information sciences 2010-05, Vol.53 (5), p.1034-1043
Main Authors: Sun, Jun, Liu, YingZhuang, Zhu, GuangXi
Format: Article
Language:English
Subjects:
Antenna gain
Antennas
Cellular
Cellular communication
Channels
Computer Science
Degrees of freedom
Gain
Information Systems and Communication Service
Interference
Mathematical analysis
Receivers
Receivers & amplifiers
Research Papers
Stations
天线增益
容量限制
接入信道
接收天线
模拟蜂窝网络
用户数量
相互干扰
自由度
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Summary:In this paper, we consider the capacity limits of the cellular network by modeling it as consisting of two mutually interfering multiple access channels with multiple antennas at each receiver （e.g., base station）. By developing a tight outerbound as well as an achievable scheme which exploits the idea of interference alignment, we are able to exactly characterize the sum degrees of freedom （DoF） of the network when the channel coefficients are timeor frequency-varying, which equals KM K＋min（M,K） （where M and K denote the number of receiver antennas and number of users in per cell, respectively） per cell. From the DoF result, it can be observed that in addition to the multi-user gain which has been reported for the network with single-antenna BSs, there also exists the multi-antenna gain in the cellular network. In particular, when the number of users is large, we can nearly achieve the interference-free DoF of a cellular network with multiple-antenna BSs, which is a somewhat surprising result.
ISSN:1674-733X
1869-1919
DOI:10.1007/s11432-010-0085-x