基于DBF的星—地异构共存认知MIMO系统的干扰减缓

doi:10.3969/j.issn.1000-436x.2014.10.006

Abstract

Abstract:

For the coexistence and increasing interference of satellite-terrestrial network and terrestrial wireless network,a typical scenario where the geostationary earth orbit (GEO) satellite-terrestrial network and the 4G mobile communication network coexist heterogeneously was analyzed.Besides,a multi-user cognitive system model that secondary satellite terminals interfere the primary multiple input multiple output (MIMO) 4G based stations was also proposed,with whose general signal processing was deduced.Meanwhile,digital beam forming (DBF) technology in 4G based station system was adopted to minimize the cognitive interference caused by multi-antennas and multi-users.And an optimal beam weight based on fixed azimuth interference (OBW-FAI) was proposed.Weight vector was only related to the azimuth of the interferences,thus the proposed algorithm does not need real-time and repeat calculations,and had small complexity.Finally,the numerical simulation results verify that the proposed system and algorithm can effectively reduce interference between satellite-terrestrial network and terrestrial wireless network to a certain extent.

Key words: satellite-terrestrial heterogeneous coexistence, cognitive network, multi-user multiple input multiple output;digital beam forming, interference mitigation

Yong LIAO,Tao WANG,Huan CHEN,Xin ZHOU,Yu-feng LI. Interference mitigation for satellite-terrestrial heterogeneous coexistence cognitive MIMO system based on DBF[J]. Journal on Communications, 2014, 35(10): 42-49.

Figures/Tables 9

References 26

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参数	数值
卫星经度	115.5°E
覆盖的纬度范围	3°N～53°N
覆盖的经度范围	73°E～135°E
载波频率	2.3 GHz

参数	数值
VSAT发射功率	30 dBm
VSAT天线增益	42.7 dB
VSAT EIRP	72.7 dBm
VSAT天线口径	1.2 m
VSAT和BS之间的距离	130 m
路径损耗	36.42 dB
BS天线增益	10 dB
噪声功率(8 MHz)	?104.956 dBm

参数	数值
目标用户发射功率	20 dBm
目标用户天线增益	10 dB
目标用户和BS之间的距离	0.05°5 km
路径损耗范围	48.08°68.08 dB
BS天线增益	10 dB
噪声功率(8 MHz)	?104.956 dBm

Interference mitigation for satellite-terrestrial heterogeneous coexistence cognitive MIMO system based on DBF

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