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| 1 | A Precoding Scheme to Reduce the Effect of Channel Correlation for MIMO-PLC System显示文摘MIMO technique can provide higher information throughput and transmission reliability for the PLC system.However,the MIMO-PLC system based on three-conductor cable has a high correlation among its sub-channels.Spatial multiplexing technology will be affected by the spatial correlation between MIMO-PLC sub-channels.To reduce the system bit error rate caused by MIMO-PLC correlation among sub-channels,this paper proposed a phase rotation precoding scheme for the 2×2 closed-loop MIMO-PLC system.According to the channel transfer function of high correlation MIMO-PLC system,the phase rotation precoding matrix F is calculated,and the transmission signal matrix S is modulated with the F,the code distance at the receiving point with smallest code distance is increased by phase rotation.Simulation results show that the scheme can effectively reduce the bit error rate of the 2×2 MIMO-PLC system based on ML detection,and significantly improve the system performance. | Wangbin Cao Hui Kang Xiaolin Liang Zhiyuan Xie Xiongwen Zhao | 2023 | China Communications2023，20，2： | 0 |
| 2 | Characteristics and modeling of UAV-vehicle MIMO wideband channels显示文摘A geometry-based stochastic model(GBSM) for unmanned aerial vehicle to vehicle(UAV-V) multiple-input multiple-output(MIMO) wideband channel is proposed to investigate the characteristics of UAV-V channel. Based on the proposed model, a three-dimensional(3D) wideband channel matrix regarding channel numbers, time and delay is constructed. And some important channel characteristics parameters, such as power delay profile(PDP), root mean square(RMS) delay spread, RMS Doppler spread, channel gain and Doppler power spectral density(PSD) are investigated with different vehicle velocities. It is much simpler and clearer compared with the complex analytical derivations. The results are compared with validated analysis to confirm the theoretical analysis. | Liang Xiaolin Ma Jiaxu Cao Wangbin Xu Jianpeng Liu Shuaiqi Zhao Xiongwen | 2023 | The Journal of China Universities of Posts and Telecommunications2023，30，6： | 0 |
| 3 | Fairness optimization and power allocation in cognitive NOMA/OMA V2V network with imperfect SIC显示文摘In order to improve the reliability and resource utilization efficiency of vehicle-to-vehicle(V2V)communication system,in this paper,the fairness optimization and power allocation for the cognitive V2V network that takes into account the realistic three-dimensional(3D)channel are investigated.Large-scale and small-scale fading are considered in the proposed channel model.An adaptive non-orthogonal multiple access(NOMA)/orthogonal multiple access(OMA)scheme is proposed to reduce the complexity of successive-interference-cancellation(SIC)in decoding and improve spectrum utilization.Also,a fairness index that takes into account each user's requirements is proposed to indicate the optimal point clearly.In the imperfect SIC,the optimization problem of maximizing user fairness is formulated.Then,a subgradient descent method is proposed to solve the optimization problem with customizable precision.And the computational complexity of the proposed method is analyzed.The achievable rate,outage probability and user fairness are analyzed.The results show that the proposed adaptive NOMA/OMA(A-NOMA/OMA)outperforms both NOMA and OMA.The simulation results are compared with validated analysis to confirm the theoretical analysis. | Liang Xiaolin Liu Qianlong Cao Wangbin Liu Shuaiqi Zhao Shuhuan Zhao Xiongwen | 2023 | The Journal of China Universities of Posts and Telecommunications2023，30，6： | 0 |
| 4 | Performance analysis of different coding schemes for wideband vehicle-to-vehicle MIMO systems显示文摘The signal is subjected to lots of interferences in vehicle-to-vehicle(V2V)channel propagation,resulting in receiving error codes.Two-dimensional(2D)and three-dimensional(3D)geometrical channel models are used to depict the wideband V2V multiple-input multiple-output(MIMO)channels.Using the channel model,Turbo code and low-density parity-check(LDPC)code are investigated for wideband V2V MIMO system,and the encoding and the decoding schemes are investigated.The bit error rate(BER),channel capacity and outage probability of wideband V2V MIMO system using Turbo code and LDPC code are analyzed at different typical speeds.The results show that the performance of wideband V2V MIMO system using Turbo code outperform that using LDPC code.The performance is affected by transmitting and receiving speeds with the same coding scheme.And the channel capacity of the 3D channel is larger than that of 2D channel. | Liang Xiaolin Rong Zhanyi Cao Wangbin Liu Shuaiqi Zhao Xiongwen | 2023 | The Journal of China Universities of Posts and Telecommunications2023，30，6： | 0 |
| 5 | Modeling and realization of mobile-to-mobile wideband MIMO channels based on the geometrical multi-ring and multi-ellipse stochastic scattering model显示文摘A geometry-based stochastic scattering model( GBSSM) based on geometrical multiple rings and ellipses is proposed for wideband multiple-input multiple-output( MIMO) mobile-to-mobile( M2 M) fading channels. The proposed GBSSM is deployed with cross-polarized antennas and can be applied for the line-of-sight( LOS) and nonLOS( NLOS) scenarios by considering the single-bounced( SB) and double-bounced( DB) components. The channel realization is much more straightforward and concise to study the channel characteristics compared with the too complicated analytical solutions available so far. Based on the proposed GBSSM and realized channel,the channel characteristics and parameters at 2 GHz and 5 GHz with 100 MHz bandwidth are further investigated. The results can be used in the link and system level simulations in M2 M radio systems. | Liang Xiaolin Cao Wangbin Zhao Xiongwen | 2018 | The Journal of China Universities of Posts and Telecommunications2018，25，5： | 0 |
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