Block diagonalization assisted robust transceiver design method in multi-cell MIMO system

Abstract

The invention provides a block diagonalization assisted robust transceiver design method in a multi-cell MIMO system. The method comprises the following steps: step 1: setting an operation mode of the multi-cell MIMO system; step 2: defining a signal to interference plus noise ratio (SINR) of a single user or receiver, and calculating the signal to interference plus noise ratio of the k user or receiver; step 3: performing block diagonalization precoding by each transmitter according to a local estimation channel; step 4: calculating a lower bound value of the signal to interference plus noise ratio when the channel has a bounded error; step 5: using the lower bound value of the signal to interference plus noise ratio as the signal to interference plus noise ratio of the worst case, importing a slack variable, and transforming to solve a beam forming vector problem of the transmitters or receivers by using a convex optimization method; and step 6: obtaining a robust beam forming vector by using an alternate optimization method. According to the block diagonalization assisted robust transceiver design method provided by the invention, the robustness for the bounded error is relatively high, and each transmitter only uses the local CSI to perform the block diagonalization precoding, thereby reducing the feedback cost and guaranteeing the minimum SINR performance.

Description

technical field [0001] The invention relates to a method in the technical field of wireless communication, in particular to a robust transceiver design method assisted by block diagonalization in a multi-cell MIMO system. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the requirements of large traffic volume, high speed and high spectral efficiency of wireless communication have become increasingly urgent. In future wireless communication systems, all transmitters adopt full frequency multiplexing, which makes inter-cell interference in a multiple-input multiple-output (MIMO) system more complicated. As a key technology for suppressing inter-cell interference in a multi-cell MIMO system, the joint transceiver design method of multiple base stations cooperation has become one of the research hotspots. According to the number of users in a cell, from the perspective of information theory, a multi-cell MIMO syste...

AI Technical Summary

Problems solved by technology

As we all know, the algorithm based on interference alignment has certain limitations, such as high requirements on the dimension of the transmitting antenna, and it is only optimal in the case of high signal-to-noise ratio.

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