Communication terminal, interference cancellation method and device thereof, and data demodulation method

Abstract

A method and a communication terminal for reducing or cancelling inter-cell interference in a multicarrier communication system, where multicarrier symbols are received that include pilot data from interface stations not in communication with the communication terminal. Subcarrier data of the subcarriers that contain the pilot data are retrieved and used to reduce interference in the received multicarrier symbols.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a communication terminal, an interference cancellation method and device thereof, and a data demodulation method. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is Orthogonal Frequency Division Multiplexing technology. In fact, OFDM is a kind of multi-carrier modulation (MCM, Multi-Carrier Modulation). Its main idea is to divide the channel into several orthogonal sub-channels, Convert high-speed data signals into parallel low-speed sub-data streams, modulated to transmit on each sub-channel. Orthogonal signals can be separated by adopting a correlation technique at the receiving end, which can reduce mutual interference (ICI, Inter Channel Interference) between sub-channels. The signal bandwidth on each sub-channel is smaller than the correlation bandwidth of the channel, so each sub-channel can be regarded as flat fading, so th...

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Problems solved by technology

[0004] In LTE system networking, including Time Division Duplex (TDD, Time Division Duplex) LTE or Frequency Division Duplex (FDD, Frequency Division Duplex) LTE, due to limited spectrum resources, it is difficult to achieve no Interference from other same-frequency cells, when the same-frequency neighbor cell interference is serious at the edge of the LTE cell, will affect the service performance of the communication terminal (UE, User Equipment) at the edge of the cell and reduce the throughput rate of UE receiving data

[0005] Since the LTE system is an OFDM system, in a common OFDM system, it is difficult to eliminate co-channel interference through interference cancellation or MMSE (Minimum Mean Square Error) equalization. Generally, in the OFDM system (including FDD or TDD LTE), the interference of the same-frequency cell is treated as pure noise interference, and the system performance is improved by the redundancy of the codec system, but the redundancy of the coding system is improved. The margin will reduce the throughput of the system and reduce the resource utilization of the cell

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