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感知无线电作为提高频谱使用效率的有效手段而得到研究人员的广泛关注,成为当前无线通信领域研究的热点.基于子空间理论,文中针对感知网络提出了一种能够最大程度地保持用户间正交性、抑制用户间干扰的低复杂度调度算法.在该调度算法的基础上,通过对发送波束成形、调度以及功率分配的联合优化,提出了一套完整的感知网络下行链路解决方案.仿真结果表明,所提出的方案能够在保证对主用户的干扰满足要求的前提下,使感知网络达到较大的吞吐量.同时,该算法还具有良好的健壮性,即使是使用简单而非最优的等功率分配策略,也不会带来明显的性能下降.
Perceived radio has been widely researched by researchers as an effective means to improve the efficiency of spectrum use, and has become a hotspot in the field of wireless communications.According to the theory of subspace, this paper proposes a method that can maximize the orthogonality among users And low complexity scheduling algorithm to suppress inter-user interference.Based on the scheduling algorithm, a complete set of perceptual network downlink solution is proposed through the joint optimization of transmit beamforming, scheduling and power allocation.The simulation results It shows that the proposed scheme can make the perceived network reach more throughput under the premise of ensuring the interference to the primary user.At the same time, the algorithm has good robustness, even if it is easy to use rather than optimal Such as power distribution strategy, it will not bring significant performance degradation.