Emission method of control channel in LTE (Long Term Evolution) system

Abstract

The invention provides an emission method of a control channel in an LTE (Long Term Evolution) system. The method comprises the steps that every two pairs of dual polarized antennas are divided into one group in an LTE base station which is based on the dual polarized antennas; when signals of the control channel are emitted, antenna units in the same group emit identical signals, a relative time delay T exists between the emitted signals of the two pairs of the dual polarized antennas in the group, and the signals are emitted from the same antenna port; and SFBC (space frequency block code) treatment is carried out on the signals between two groups on two antenna ports and the signals are sent. According to the method disclosed by the invention, broadcast weighting is not needed, the covering power of the control channel is enhanced, and the influence brought by antenna rank reduction can be reduced.

Description

technical field [0001] The invention relates to a signal transmission technology of a wireless communication system, in particular to a transmission method of a control channel in an LTE system. Background technique [0002] The downlink transmission channels of the LTE system are divided into cell-level and user-level. For cell-level channels, commonly known as control channels, including PDCCH, PHICH, PCFICH, PBCH and synchronization signals (PSS and SSS), it is necessary to transmit signals corresponding to beams for cell-level coverage. According to the usual network deployment scheme, the beam at the cell level is generally 65 degrees. [0003] Considering that the number of wireless communication systems will increase in the future, site selection will become more and more difficult. Therefore, multi-system common antenna feed will be a development trend, which requires antennas to be broadband. At present, considering the wideband dual-polarization antenna (FAD ante...

AI Technical Summary

Problems solved by technology

For the F-band and A-band of the FAD antenna, because its unit beam is 90 degrees, the efficiency of its broadcast weight is high (more than 60%), and for the D-band, because its unit beam width is only 65 degrees, its broadcast The efficiency of the weight is only about 40%, which will have a great impact on the coverage of the control channel

At the same time, the formation of the broadcast beam has high requirements for antenna calibration, and once the antenna rank is reduced, it will have a great impact on the broadcast beam, so this solution has certain limitations from the perspective of practical application

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