Multi-antenna transmission process and system and relative mobile terminal

摘要

A multi-antenna transmission process provides down-link radio coverage through a transmission system. The transmission system includes at least one multi-radiator transmitting antenna, directed towards a mobile terminal, at least one database associated with at least one coverage cell and a position of the mobile terminal, a processor cooperating with the at least one multi-radiator transmitting antenna and the at least one database to associate a transmission direction with the position of the mobile terminal by detecting a position of the mobile terminal, storing the position into the at least one database, and determining at least one transmission direction from the at least one multi-radiator transmitting antenna to the mobile terminal depending on the position stored in the at least one database, wherein at least one of the transmission parameters set in order to transmit in the transmission direction is associated with the stored position of the mobile terminal.

主权项

1. A multi-antenna transmission process for providing down-link radio coverage from a radio base station to a mobile terminal in a network for radio mobile communications through a transmission system comprising:
at least one multi-radiator transmitting antenna comprising a plurality of M radiating elements each transmitting a plurality of N signals on one same carrier, each one of the N signals being transmitted M times, the overall transmission requiring N×M parameters forming a precoding matrix, each multi-radiator transmitting antenna being directed towards at least one mobile terminal; at least one database associated with at least one coverage cell of said mobile communications network and containing information about a position of said mobile terminal; a processor cooperating with said at least one multi-radiator transmitting antenna and said at least one database, said processor being adapted to associate a transmission direction with said position of said mobile terminal, wherein said transmission direction is suitable for reaching said mobile terminal and said transmission direction depends on a portion of said parameters that determines a phase of the carrier in a direction of maximum radiation, comprising the steps of:
a) detecting a position of said mobile terminal;b) storing said position into said at least one database;c) determining at least one transmission direction of at least one transmission beam from said at least one multi-radiator transmitting antenna to said mobile terminalwherein said at least one transmission direction is determined based on at least a portion of the transmission parameters of the precoding matrix required for transmitting in said transmission direction that has been stored by said processor in said database in association with a stored position of said mobile terminal, andwherein some of the remaining parameters of the precoding matrix are stored by the processor in said database as values of relative phase displacement with respect to said portion of parameters determining the phase of the carrier in the direction of maximum radiation.