Interference cancellation method and apparatus

Abstract

An embodiment of the invention provides an interference cancellation method and apparatus, which relate to the field of communication, for reducing the interference in a first communication system under a shared spectrum scene, thereby increasing the throughput of the first communication system. The interference cancellation method is applied to a first cell having a neighboring second cell. The first cell belongs to the first communication system, the second cell belongs to a second communication system, and the first cell and the second cell have a shared spectrum. The method comprises the steps of carrying out, by a base station of the first cell, interference pre-cancellation for a received uplink signal based on a preset strategy to obtain an interference pre-cancellation signal, the uplink signal including a first uplink signal transmitted by user equipment in the first cell and a second uplink signal transmitted by user equipment in the second cell; and eliminating an interference signal in the interference pre-cancellation signal based on a channel response estimated value of the interference pre-cancellation signal. The embodiment of the invention is applied between heterogeneous systems where the shared spectrum is present.

Description

technical field [0001] The embodiments of the present invention relate to the communication field, and in particular, to an interference elimination method and device. Background technique [0002] With the rapid development of the mobile industry, LTE (Long Term Evolution, long-term evolution) system deployment has become a global trend. The 1800MHz spectrum has become the first choice for LTE system deployment due to its excellent coverage. However, 1800MHz spectrum resources are scarce, and are currently mostly used for GSM (Global System for Mobile Communication, Global System for Mobile Communication) system deployment. Since there are still a considerable number of hotspots in many areas of the GSM system at this stage, operators cannot directly re-plan all the 1800MHz spectrum of the GSM system into the 1800MHz spectrum of the LTE system for network-wide deployment. In addition, the 1800M bandwidth of 50% of the operators is 10M~25M, which cannot meet the large band...

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Problems solved by technology

[0005] Since the GSM system is a narrowband signal, under the same level conditions, the signal power of the GSM system is stronger than that of the LTE system. Since the strength of the interference signal power has a greater impact on the accuracy of the interference covariance matrix, the GSM system and LTE In the scenario where the system has a shared spectrum, when IRC technology is used to suppress or eliminate the interference generated by the GSM system, the interference signal cannot be effectively eliminated or suppressed, which may lead to an increase in the bit error rate of the eNodeB (envoled NobeB, evolved base station) in the LTE system , the throughput drops

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