Interference reduction in a radio communications system

摘要

Method for transmitting signals over an air interface in a radio telecommunication system with a TDD frame structure, wherein the air interface is arranged between at least one access point (AP) of the radio telecommunication system and at least one user terminal (MT), and within traffic channels bursts in a downlink (DL) direction consist only of data symbols without a preamble and/or pilot symbols. In the specific case of an OFDM system based on TDD (Time Division Duplex), cochannel interference would arise when more than one MTs use the same subcarrier frequency at a specific timeslot. The basic feature of the proposed air interface is the employment of interference reduction techniques for improving the spectrum efficiency and capacity. It is possible to eliminte the interference among the MTs served by different APs in a service area by jointly processing the received signals and transmitted signals of all APs in a single CU. Joint transmission (JT) can be used in the downlink and the downlink bursts consist only of data symbols offering high data rates. <IMAGE>