Development of Array Antenna for LTE Small Cell Base Stations
نویسندگان
چکیده
Mobile service providers in recent years have been facing rapid increases in data traffic, so have much interest in small cell base stations such as picocells and femtocells. However, these small cell base stations are recognized as potential causes of inter-cell interference, since it is highly probable that they will be deployed using the same radio frequency as used by macrocells, due to the scarcity of available radio frequencies. To address this problem, we have developed an interference suppression array antenna for Long Term Evolution (LTE) uplinks, to provide directivity based on a minimum mean square error (MMSE) algorithm. This paper proposes a new method for calculating MMSE weighting factors at the LTE resource block (RB) level. Furthermore, we indicate that this method is excellent in that it requires neither the resource assignment information of the adjacent cells nor the scheduling information used by higher layers. Lastly, this paper shows that the proposed method is suitable for the latest softwaredefined radio technology, as proven through implementation on a system-on-chip (SoC) consisting of a multicore digital signal processor and an ARM processor.
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