Interruption relaxation alignment method based on multi-point multi-user coordination downlink

Abstract

The invention discloses an interruption relaxation alignment method based on multi-point multi-user coordination downlink. The method specially comprises the following steps: (1) completing channel estimation at a sending end by using a corresponding channel estimation technique according to that different performances and transmission modes are required by communication systems to obtain channel matrix parameters; (2) establishing an optimized equation consisting of constraint conditions and a target function, wherein the constraint conditions are formed after relaxed interruption and alignment are carried out on constraint conditions by a relaxation factor lambda; (3) solving the optimized equation; (4) respectively performing premultiplication on a sending signal by various receiving ends with a solved wave beam formation matrix so as to complete pretreatment; and (5) carrying out conjugated transposition premultiplication of the received signal by various receiving ends with a solved interruption elimination matrix so as to complete post-treatment. The method has the advantages that a wave beam formation matrix set and an interruption elimination matrix set which are used for inhibiting multi-user interruption can be rapidly solved, and the pre-treatment and post-treatment are respectively carried out by the sending end and receiving ends so as to inhibit the multi-user interruption.

Description

technical field [0001] The present invention belongs to the field of communication technology, and further relates to the field of multi-point multi-user cooperative downlink communication technology. Based on the interference alignment technology, the interference relaxation technology is used to pre-process the signal at the sending end and post-process the received signal at the receiving end, so that The multi-user interference generated during multi-point multi-user cooperative downlink communication is suppressed. Background technique [0002] In the downlink of the multi-point multi-user cooperative communication system, multiple transmission points transmit information to multiple users at the same time in a cooperative manner. Any user will receive signals from other transmission points while receiving useful signals, which may cause multi-user interference. In order to eliminate interference, the interference alignment technology is mainly used at present to make ...

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Problems solved by technology

Although this method achieves the goal of eliminating multi-user interference through the joint processing of the sending end and the receiving end, there are still shortcomings in this method: when the number of sending ends and the number of receiving ends are both greater than or equal to 3, the solution to the joint beamforming It is a NP-hard (NondeterministicPolynomial-timehard, nondeterministic polynomial time hard) problem, it is difficult to solve the beamforming matrix set and interference cancellation matrix set required by the system to eliminate multi-user interference in polynomial time, resulting in engineering There is no way for the transmitting end and the receiving end to perform joint beamforming in the next step, and interference alignment cannot be achieved to eliminate multi-user interference

Although the iterative solution method can be used to obtain the beamforming matrix set and the interference cancellation matrix set, but at the same time, the multi-user interference is amplified during the operation process, and the effect is very poor in actual operation

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