In this paper,we propose a sub-6GHz channel assisted hybrid beamforming(HBF)for mmWave system under both line-of-sight(LOS)and non-line-of-sight(NLOS)scenarios without mmWave channel estimation.Meanwhile,we resort to ...In this paper,we propose a sub-6GHz channel assisted hybrid beamforming(HBF)for mmWave system under both line-of-sight(LOS)and non-line-of-sight(NLOS)scenarios without mmWave channel estimation.Meanwhile,we resort to the selfsupervised approach to eliminate the need for labels,thus avoiding the accompanied high cost of data collection and annotation.We first construct the dense connection network(DCnet)with three modules:the feature extraction module for extracting channel characteristic from a large amount of channel data,the feature fusion module for combining multidimensional features,and the prediction module for generating the HBF matrices.Next,we establish a lightweight network architecture,named as LDnet,to reduce the number of model parameters and computational complexity.The proposed sub-6GHz assisted approach eliminates mmWave pilot resources compared to the method using mmWave channel information directly.The simulation results indicate that the proposed DCnet and LDnet can achieve the spectral efficiency that is superior to the traditional orthogonal matching pursuit(OMP)algorithm by 13.66% and 10.44% under LOS scenarios and by 32.35% and 27.75% under NLOS scenarios,respectively.Moreover,the LDnet achieves 98.52% reduction in the number of model parameters and 22.93% reduction in computational complexity compared to DCnet.展开更多
The 300 GHz band is located between millimeter wave and terahertz wave,and has abundant spectrum resources,which provides the possibility for realizing high-speed,large-capacity and low-latency wireless communication....The 300 GHz band is located between millimeter wave and terahertz wave,and has abundant spectrum resources,which provides the possibility for realizing high-speed,large-capacity and low-latency wireless communication.However,300 GHz long-distance wireless communication also faces many technical challenges,such as serious signal propagation loss,susceptibility to atmospheric environment,and high difficulty in antenna design and manufacturing.Starting from the overview of 300 GHz long-distance wireless communication,this paper reveals the channel estimation algorithm in 300 GHz long-distance wireless communication system,and analyzes the transmitter,receiver,channel coding and decoding technologies,hoping to provide some reference for the development and innovation of wireless communication technology.展开更多
基金supported in part by the National Natural Science Foundation of China under Grants 62325107,62341107,62261160650,and U23A20272in part by the Beijing Natural Science Foundation under Grant L222002.
文摘In this paper,we propose a sub-6GHz channel assisted hybrid beamforming(HBF)for mmWave system under both line-of-sight(LOS)and non-line-of-sight(NLOS)scenarios without mmWave channel estimation.Meanwhile,we resort to the selfsupervised approach to eliminate the need for labels,thus avoiding the accompanied high cost of data collection and annotation.We first construct the dense connection network(DCnet)with three modules:the feature extraction module for extracting channel characteristic from a large amount of channel data,the feature fusion module for combining multidimensional features,and the prediction module for generating the HBF matrices.Next,we establish a lightweight network architecture,named as LDnet,to reduce the number of model parameters and computational complexity.The proposed sub-6GHz assisted approach eliminates mmWave pilot resources compared to the method using mmWave channel information directly.The simulation results indicate that the proposed DCnet and LDnet can achieve the spectral efficiency that is superior to the traditional orthogonal matching pursuit(OMP)algorithm by 13.66% and 10.44% under LOS scenarios and by 32.35% and 27.75% under NLOS scenarios,respectively.Moreover,the LDnet achieves 98.52% reduction in the number of model parameters and 22.93% reduction in computational complexity compared to DCnet.
文摘The 300 GHz band is located between millimeter wave and terahertz wave,and has abundant spectrum resources,which provides the possibility for realizing high-speed,large-capacity and low-latency wireless communication.However,300 GHz long-distance wireless communication also faces many technical challenges,such as serious signal propagation loss,susceptibility to atmospheric environment,and high difficulty in antenna design and manufacturing.Starting from the overview of 300 GHz long-distance wireless communication,this paper reveals the channel estimation algorithm in 300 GHz long-distance wireless communication system,and analyzes the transmitter,receiver,channel coding and decoding technologies,hoping to provide some reference for the development and innovation of wireless communication technology.
