China Telecom and Anhui Mobile Communication Co. | Date: 2015-03-25
A bi-polarized broadband annular radiation unit, for being installed on a metal reflective plate thus constituting a communication antenna and defining an annular construction by two pairs of orthogonally polarized dipoles, includes two pairs of orthogonally polarized dipoles, each dipole comprising two symmetrical unit arms of a single line sheet shape, one end of a unit arm being facing to a corresponding end of the other unit arm, and a distal end of each unit arm of at least one pair of dipoles is provided with a loading line; and a plurality of balun arms feeding power to and supporting respective dipoles, each balun arm including two parallel balun lines, and the top ends of the two balun lines being connected with corresponding ends of the two unit arms of a corresponding dipole. Each unit arm and the balun line and/or loading line connected to the same unit arm are made by sheet metal stamping forming process or casting process.
Ran Y.,China Telecom
IEEE Communications Magazine | Year: 2011
This article, by analyzing the damage on the communication network caused by the Wenchuan Earthquake, and the priorities of the communication restoration construction, points out that in the future emphasis shall be laid on construction of the emergency communication capability by providing priority service functions for the public switched telephone network, and attaching importance to wireless communications. It also proposes the priorities of the postdisaster network planning and construction, as well as a study on the future-oriented disaster countermeasures of networks and technologies. An earthquake measuring 8 on the Richter scale struck Wenchuan County of Aba Prefecture of Sichuan Province at 2:28:04 pm of May 12, 2008. The terrible catastrophe posed an allround test to China in terms of disaster management, a test not only on the emergency response capability of all government departments, but also on the abilities of the whole society and ordinary citizens to deal with a catastrophe. It especially put the emergency capability and fast response capability of the communication sector, the Life Line, to a severe test. © 2006 IEEE.
China Telecom | Date: 2015-08-19
A multi-antenna array for a LTE MIMO communication system is provided in an embodiment of this invention, comprising a reflection plate and a power feed network disposed on the back of the reflection plate, a plurality of power distribution plates being arranged on the back of the reflection plate for controlling power distribution for antenna radiation units in different polarization manners respectively, the plurality of power distribution plates being disposed in upper and lower layers and are located at the geometrical center of a parallel plane of the reflection plate. The embodiment of this invention may prevent the scrambled arrangement of the power feed network in a multi-antenna array adopted in a LTE MIMO communication system, simplify power feed manner of antenna radiation units in different polarization manners, reduce complexity and the rate of errors in mass production of multi-antenna arrays of LTE MIMO communication systems, and facilitate locating faults and replacing feed circuits.
China Telecom | Date: 2015-05-13
The present disclosure provides a quadri-polarized antenna oscillator, a quadri-polarized antenna and a quadri-polarized multi-antenna array. The quadri-polarized antenna oscillator comprises four polarized oscillators, wherein midpoints of the four polarized oscillators are coincident, a polarization direction of a first polarized oscillator is a horizontal direction, a polarization direction of a second polarized oscillator is perpendicular to the horizontal direction, a polarization direction of a third polarized oscillator has a 45 angle with the horizontal direction; and a polarization direction of a fourth polarized oscillator has a -45 angle with the horizontal direction. By integrating four polarized oscillators having different polarization directions into one antenna oscillator, the width of the MIMO multi-antenna is reduced and the horizontal space between two columns of dual-polarized antennas is not required any more, thus the deployment of LTE and 4G networks are favourably implemented without extra space requirement to the top surface of a base station.
China Telecom | Date: 2014-01-30
This invention discloses a multi-mode antenna and a base station, the multi-mode antenna comprising a CDMA dual-polarized antenna for CDMA radio frequency signals and two MIMO dual-polarized antennas for LTE radio frequency signals with a plurality of linearly arranged radiation elements; the two MIMO dual-polarized antennas are respectfully vertically stacked right above and right below the centre radiation element of the CDMA dual-polarized antenna; and the radiation elements in the two MIMO dual-polarized antennas are nested in or inserted between the radiation elements of the CDMA dual-polarized antenna according to the distance between the radiation elements of the CDMA dual-polarized antenna and the distance between the radiation elements of each MIMO dual-polarized antenna. The present invention combines the technologies of nested antenna radiation elements and vertical isolation separation of MIMO antennas so as to integrate a CDMA dual-polarized antenna and two MIMO dual-polarized antennas into one physical antenna.
China Telecom | Date: 2015-12-09
A feeding network is realized by dielectric phase shifting module. The module includes a dielectric device into which interlayer space is defined, a first conductor and a second conductor disposed side by side into the interlayer space and a third conductor located outside of the interlayer space and connected, at different locations, to one end, located at a same side, of each of the first and second conductors. Another end of the first conductor is defined as an input end, while another end of the second conductor and any end of the third conductor are all defined as output ends. The dielectric device is configured to slide along a longitudinal direction of the first and second conductors under external force so as to change phase of signals fed in from the input end and fed out from the output ends. Two dielectric phase-shift modules constitute a phase-shift unit thereof.
China Telecom | Date: 2015-06-24
A resource allocation method and base station. The resource allocation method comprises: within a current scheduling period, determining priorities of users in a cell for subcarriers in available frequency resources, and among the available frequency resources of the cell, allocating a corresponding available frequency resource for each user in the cell according to the priorities of all users for the subcarriers, so that the frequency resources that can be used by the edge users cover all available frequency ranges of the cell. Therefore, when frequency selectivity fading occurs in the channel, a decline in communication quality caused by allocating carrier resources for the edge users in the limited frequency resources is avoided, the probability that the edge users use deeply fading frequency resources is reduced, and interruption in the communication process is decreased, thereby improving system throughput.
China Telecom | Date: 2015-10-07
Disclosed is a multi-frequency array antenna, which comprises: a reflective metal plate, a low-frequency radiation element which is arranged on the reflective metal plate and operating in a first frequency band range, and a high-frequency radiation column element operating in a second frequency band range. The low-frequency radiation column element comprises several low-frequency radiation units arranged at an equal first distance in the axial direction of a first reference axis. The high-frequency radiation column element comprises several high-frequency radiation units arranged at an equal second distance in the axial direction of the first reference axis. The first distance is 2.5 times the second distance. At least one of the low-frequency radiation units is nested with one high-frequency radiation unit locationally corresponding thereto, and at least one of the low-frequency radiation units is axially located between two adjacent high-frequency radiation units close to the low-frequency radiation unit. The present invention realizes the optimal setting of the distances between the radiation units of the low-frequency radiation column element and the high-frequency radiation column element, thereby realizing the optimization of the electrical performance in each frequency band.
China Telecom | Date: 2015-08-05
An array antenna and a base station are provided. The array antenna comprises a plurality of linear arrays, uplink-downlink duplexers, and beam-forming networks. Each linear array is a dual-polarized linear array. An input end of the beam-forming network is coupled with a downlink signal output end of a RF(Radio Frequency) unit, and two output ends of the beam-forming network are respectively coupled with downlink signal transmitting ends of two uplink-downlink duplexers; transceiving ends shared by two uplink-downlink duplexers are respectively coupled with arrays having the same polarization direction of two adjacent linear arrays, and the two arrays having the same polarization direction form a beam with 65-degree beamwidth on the downlink through the beam-forming network; uplink signal output ends of the two uplink-downlink duplexers are coupled with uplink signal input ends of the RF unit; linear arrays uncoupled with uplink-downlink duplexers in the plurality of linear arrays are all coupled with the uplink signal input ends of the RF unit respectively. Thereby, a beam with 65-degree beamwidth may be formed by a transmitting antenna on a downlink.
China Telecom | Date: 2014-12-31
A quadri-polarized antenna oscillator, a quadri-polarized antenna, and a quadri-polarized multi-antenna array are provided. The quadri-polarized antenna oscillator comprises four polarized oscillators, wherein midpoints of the four polarized oscillators are coincident; a polarization direction of a first polarized oscillator is a horizontal direction; a polarization direction of a second polarized oscillator is perpendicular to the horizontal direction; a polarization direction of a third polarized oscillator has a 45 angle with the horizontal direction; and a polarization direction of a fourth polarized oscillator has a 45 angle with the horizontal direction. By integrating four polarized oscillators having different polarization directions into one antenna oscillator, the width of the MIMO multi-antenna is reduced, and the horizontal space between two columns of dual-polarized antennas is not required any more, thus the deployment of LTE and 4G networks are favourably implemented without extra space requirement to the top surface of a base station.