For multi-user cooperative Distributed MIMO (D-MIMO) systems, a low-complexity Remote Radio Unit (RRU) selection and adaptive bit partition algorithm is proposed to maximize the transmission Signal-to-Interference-Noi...For multi-user cooperative Distributed MIMO (D-MIMO) systems, a low-complexity Remote Radio Unit (RRU) selection and adaptive bit partition algorithm is proposed to maximize the transmission Signal-to-Interference-Noise Ratio (SINR). Considering limited feedback, each user can adaptively select an RRU cluster to maintain the best communication quality. Under this condition, only one codebook is utilized for quantizing the Channel State Information (CSI) with variable dimensions, which effectively reduces the codebook storage amount. Furthermore, we propose an adaptive bit partition algorithm, which separately allocates bits to quantize the desired channels and interference channels. The optimal solution is achieved through an optimization theory to minimize the effect of inter-cell interference. Simulation results show that the proposed algorithm substantially improves the performance compared to other non-adaptive schemes.展开更多
Narrowband Internet of Things(NB-IoT)has been proposed to support deep coverage(in building)and extended geographic coverage of IoT.In this paper,a power control scheme for maximizing energy efficiency(EE)of narrowban...Narrowband Internet of Things(NB-IoT)has been proposed to support deep coverage(in building)and extended geographic coverage of IoT.In this paper,a power control scheme for maximizing energy efficiency(EE)of narrowband physical uplink shared channel(NPUSCH)with the guard band is proposed.First,we form the optimization problem based on the signal model with the interferences of narrowband physical random access channel(NPRACH)which are caused by the non-orthogonality of NPUSCH and NPRACH.Then,a method of reserving guard bands is proposed to reduce these interferences.Based on it,an efficient iterative power control algorithm is derived to solve the optimization problem,which adopts fractional programming.Numerical simulation results show that NPUSCH with the guard band has better performance in EE than that without the guard band.展开更多
基金supported partially by Important National Science&Technology Specific Projects under Grant No.2010ZX03005-001-0National High Technology Research and Development of China(863 Program)under Grant No.2006AA01Z272New Century Excellent Talents in University (NCET) under Grant No.NCET-11-0593
文摘For multi-user cooperative Distributed MIMO (D-MIMO) systems, a low-complexity Remote Radio Unit (RRU) selection and adaptive bit partition algorithm is proposed to maximize the transmission Signal-to-Interference-Noise Ratio (SINR). Considering limited feedback, each user can adaptively select an RRU cluster to maintain the best communication quality. Under this condition, only one codebook is utilized for quantizing the Channel State Information (CSI) with variable dimensions, which effectively reduces the codebook storage amount. Furthermore, we propose an adaptive bit partition algorithm, which separately allocates bits to quantize the desired channels and interference channels. The optimal solution is achieved through an optimization theory to minimize the effect of inter-cell interference. Simulation results show that the proposed algorithm substantially improves the performance compared to other non-adaptive schemes.
基金supported by the National Natural Science Foundation of China under Grant No.61501056National Science and Technology Major Project of China under Grant No.2016ZX03001012ZTE IndustryAcademia-Research Cooperation Funds
文摘Narrowband Internet of Things(NB-IoT)has been proposed to support deep coverage(in building)and extended geographic coverage of IoT.In this paper,a power control scheme for maximizing energy efficiency(EE)of narrowband physical uplink shared channel(NPUSCH)with the guard band is proposed.First,we form the optimization problem based on the signal model with the interferences of narrowband physical random access channel(NPRACH)which are caused by the non-orthogonality of NPUSCH and NPRACH.Then,a method of reserving guard bands is proposed to reduce these interferences.Based on it,an efficient iterative power control algorithm is derived to solve the optimization problem,which adopts fractional programming.Numerical simulation results show that NPUSCH with the guard band has better performance in EE than that without the guard band.
