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,提出了随机波束赋形(random beam-forming)技术,高效地解决了智能天线广播信道的赋形问题。这个成果发表在 ”A Random Beamforming Technique for Omni-directional Coverage in Multiple Antenna Systems“, IEEE Trans. Vehi. Tech., No.99 Dec. 2012;
2004-2005年,提出了软频率复用(soft frequency reuse)技术, “Soft frequency reuse scheme for UTRAN LTE", Huawei, R1-050507, 3GPP RAN1 41, May, 2005,解决了长期困扰业界的OFDM的频率复用问题,被广泛研究和应用,成为LTE小区间干扰协调(Inter cell interference coordination)这一领域的事实标准;
2005年,提出"Proposal for the reduced set of DL transmission parameters", R1-050824, 3GPP RAN 1 42, Aug., 2005,统一LTE多种带宽的采样率,并用一个IFFT承载多个载波,提高了LTE产业的规模效应,简化了基站和终端的产品架构,降低了产业成本。