Radio base station and method therein for transforming a data transmission signal

摘要

A method in a radio base station for transforming a data transmission signal in a radio communications network. The radio base station is connected to an active antenna array of a first number of active transmitting antennas, which each active transmitting antenna comprises sub elements. The radio base station comprises a precoder codebook comprising precoders for transmitting signals in a diversified manner for a second number of antenna ports. The radio base station precodes the data transmission signal with a precoder selected from the precoder codebook. The radio base station furthermore transforms, linearly, the precoded data transmission signal by neutralizing a direction of the precoded data transmission signal and then directing the precoded data transmission signal vertically. The precoded data transmission signal is thereby enabled to be vertically adjusted towards a user equipment in the radio communications network.

主权项

1. A method in a radio base station for transforming a data transmission signal in a radio communications network, which radio base station serves a user equipment in the radio communications network, and wherein the radio base station is connected to an active antenna array of a first number of active transmitting antennas, each active transmitting antenna comprising sub elements, and which radio base station comprises a precoder codebook comprising precoders for transmitting signals in a diversified manner for a second number of antenna ports, the method comprising:
precoding the data transmission signal with a precoder selected from the precoder codebook; and transforming, linearly, the precoded data transmission signal by neutralizing a direction of the precoded data transmission signal and then directing the precoded data transmission signal vertically, thereby enabling vertical adjustment of the precoded data transmission signal towards a user equipment.