Patent ID: 8532684

Claim:
An interference reduction apparatus for use in a first cell adapted for a multi-input multi-output (MIMO) network, the MIMO network comprising a second cell and a third cell adjacent to the first cell, the first cell comprising an operation apparatus communicating with the interference reduction apparatus via a first serving channel and estimating the first serving channel, at least one second interfering channel of the second cell and at least one third interfering channel of the third cell to generate a first feedback signal according to a first codebook of the operation apparatus, the first feedback signal comprising first preferred matrix index (PMI) selection information and first combination information, the second cell sharing a second feedback signal comprising second PMI selection information and second combination information with the first cell, the third cell sharing a third feedback signal comprising third PMI selection information and third combination information with the first cell, the interference reduction apparatus comprising: a transceiver, being configured to receive the first feedback signal, the second feedback signal and the third feedback signal; a storage, being configured to store a second codebook; and a processor, being electrically connected to the storage and the transceiver, and being configured to retrieve the first combination information and the first PMI selection information from the first feedback signal, retrieve the second combination information and the second PMI selection information from the second feedback signal, retrieve the third combination information and the third PMI selection information from the third feedback signal, and combine at least one precoding matrix of the second codebook with each other according to the first combination information, the first PMI selection information, the second PMI selection information, the second combination information, the third PMI selection information and the third combination information to generate a combined precoding matrix; wherein the transceiver is further configure to proceed a signal transmission with the operation apparatus according to the combined precoding matrix, and share the first combination information and the first PMI information with the second cell and the third cell.