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中文摘要：
为保证异构密集网中多个窃听者联合窃听时宏基站用户的下行通信安全,该文提出一种抗多窃听者的协作安全波束成形方案。该方案通过联合设计宏基站和微基站的最优协作波束成形矢量,使保密信息传输速率提升的同时,其他用户的下行信号进一步干扰窃听者,从而最大化系统安全速率。为获得最优的协作波束成形矢量,在考虑其他合法用户的服务质量及基站功率限制时,对该安全速率最大化问题进行建模。采用半定松弛技术及Lagrange对偶理论将原始的非凸优化问题转化为一系列的半定规划问题进行求解。仿真结果验证了所提方案的有效性和安全性。
英文摘要：
To guarantee the secrecy of downlink confidential information sent to marcocell user when there were multiple colluding eavesdroppers in dense heterogenons networks, a cooperative secrecy beamforming scheme re- sistant to multi-eavesdroppers is proposed in the paper. The transmission rate of confidential information is improved and eavesdroppers are jammed by jointly optimizing the beamforming vectors at macrocell base station and femtoceU base stations. To obtain the optimal beamforming vectors, the problem of maximizing the secrecy rate is modeled under the limitations of quality of service and base station power. The secrecy rate maximization problem is non-convex. Due to the intractability, this problem is recast into a series of SemiDefinite Programs （SDP） using the SemiDefinite Relaxation （SDR） technique and the Lagrange duality. Simulation results validate the efficacy and the secrecy of the proposed scheme.
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