A multi-level soft frequency reuse (ML-SFR) scheme and a resource allocation methodology are proposed for wireless communication systems in this letter. In the proposed ML-SFR scheme, there are 2N power density limit levels, achieving better interference pattern and further improving the cell edge and overall data rate, compared to the traditional 2-level SFR scheme. The detailed design of an 8-level SFR scheme is demonstrated. Numeral results show that the cell edge spectrum efficiency is increased to 5 times of that of reuse 1 and the overall spectrum efficiency is improved by 31%. ML-SFR can be utilized in the current 4G system and would be a candidate key technology for future 5G systems.
2003年,提出了隨機波束賦形(random beam-forming)技術,高效地解決了智能天線廣播信道的賦形問題。這個成果發表在 ”A Random Beamforming Technique for Omni-directional Coverage in Multiple Antenna Systems“, IEEE Trans. Vehi. Tech., No.99 Dec. 2012;
2004-2005年,提出了軟頻率復用(soft frequency reuse)技術, “Soft frequency reuse scheme for UTRAN LTE", Huawei, R1-050507, 3GPP RAN1 41, May, 2005,解決了長期困擾業界的OFDM的頻率復用問題,被廣泛研究和應用,成為LTE小區間干擾協調(Inter cell interference coordination)這一領域的事實標準;
2005年,提出"Proposal for the reduced set of DL transmission parameters", R1-050824, 3GPP RAN 1 42, Aug., 2005,統一LTE多種帶寬的采樣率,并用一個IFFT承載多個載波,提高了LTE產業的規模效應,簡化了基站和終端的產品架構,降低了產業成本。