Hybrid precoding and combining have been considered as a promising technology, which can provide a compromise between hardware complexity and system performance in millimeter wave multiple-input multiple-output system...Hybrid precoding and combining have been considered as a promising technology, which can provide a compromise between hardware complexity and system performance in millimeter wave multiple-input multiple-output systems. However, most existing hybrid precoder and combiner designs generally assume that infinite resolution phase shifters(PSs) are used to produce the analog beamformers. In a practical scene, the design with accurate PSs can lead to high hardware cost and power consumption. In this paper, we investigate the hybrid precoder and combiner design with finite resolution PSs in millimeter wave systems. We employ alternate optimization as the main strategy to jointly design analog precoder and combiner. In addition, we propose a low complexity algorithm, where the analog beamformers are implemented only by finite resolution PSs to maximize spectral efficiency. Then, the digital precoder and combiner are designed based on the obtained analog beamformers to improve the spectral efficiency. Finally, simulation results and mathematical analysis show that the proposed algorithm with low-resolution PSs can achieve near-optimal performance and have low complexity.展开更多
In the case of legal disputes,litigation can be costly,confrontational,and take years to complete.Today more than ever,businesses are more likely to operate on a global scale,and are increasingly partial to alternativ...In the case of legal disputes,litigation can be costly,confrontational,and take years to complete.Today more than ever,businesses are more likely to operate on a global scale,and are increasingly partial to alternative dispute resolution(ADR)processes.ADR can result in quicker,non-adversarial outcomes that are enforceable in multiple jurisdictions.The use of ADR has been on the rise,particularly in Asia,with its maturing markets and growing sophistication of businesses.展开更多
基金supported by NSFC (No. 61571055)fund of SKL of MMW (No. K201815)Important National Science & Technology Specific Projects (2017ZX03001028)
文摘Hybrid precoding and combining have been considered as a promising technology, which can provide a compromise between hardware complexity and system performance in millimeter wave multiple-input multiple-output systems. However, most existing hybrid precoder and combiner designs generally assume that infinite resolution phase shifters(PSs) are used to produce the analog beamformers. In a practical scene, the design with accurate PSs can lead to high hardware cost and power consumption. In this paper, we investigate the hybrid precoder and combiner design with finite resolution PSs in millimeter wave systems. We employ alternate optimization as the main strategy to jointly design analog precoder and combiner. In addition, we propose a low complexity algorithm, where the analog beamformers are implemented only by finite resolution PSs to maximize spectral efficiency. Then, the digital precoder and combiner are designed based on the obtained analog beamformers to improve the spectral efficiency. Finally, simulation results and mathematical analysis show that the proposed algorithm with low-resolution PSs can achieve near-optimal performance and have low complexity.
文摘In the case of legal disputes,litigation can be costly,confrontational,and take years to complete.Today more than ever,businesses are more likely to operate on a global scale,and are increasingly partial to alternative dispute resolution(ADR)processes.ADR can result in quicker,non-adversarial outcomes that are enforceable in multiple jurisdictions.The use of ADR has been on the rise,particularly in Asia,with its maturing markets and growing sophistication of businesses.
