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Hybrid analog-digital beamforming is a well-known cost-efficient signal processing method for massive MIMO systems. In this paper, we propose a hybrid beamforming massive MIMO system based on Rotman lens analog beamforming with beam selection and digital beamforming. Rotman lens is a low-cost true-time-delay analog beamforming network supporting wide bandwidth signals, which is thus more attractive...
Multiple-In-Multiple-Out (MIMO) o‚ffers great potential for increasing network capacity by exploiting spatial diversity with multiple antennas. Multiuser MIMO (MU-MIMO) further enables Access Points (APs) with multiple antennas to transmit multiple data streams concurrently to several clients. However, the uplink data transmission (from client to AP) of MU-MIMO is more vulnerable because its wide...
This paper presents a concept of subarray antenna selection in massive MIMO systems, i.e., the whole antenna array is segmented into subarrays and only one antenna is selected in each subarray. The subarray antenna selection can reduce the hardware complexity of the RF switching network, but at the cost of performance degradation due to the introduced selection constraint. We evaluate such performance...
Visible Light Communication (VLC) has become popular for its feasible and reliable speed and anti-jamming features. In fact, the structure of the transmission system for commercial usage has mainly limited the VLC transmission to downlink. To achieve higher transmission rate, a proper design of transmission constellation should be designed according to channel condition. In this work, we develop a...
Antenna selection is a low cost solution to massive MIMO systems. There are two well-known design criteria of antenna selection in MIMO systems, i.e., maximizing MIMO capacity and maximizing post-processed Signal to Noise Ratio (SNR). This paper focuses on the latter one that can be achieved by selecting the largest Minimum Singular Value (MSV) of channel submatrices. A novel antenna selection is...
With the rapid development process of LTE-Advanced standardization, 8 × 8 and even higher transmission mode are proposed to support higher transmission rate and flexible transmission scheme. However, transmission environment for mobile communications is complicated and diversified, that means the spatial gain will not always increase with the increase of antenna numbers. How to make full use of spatial...
With the rapid progress of 3GPP LTE/LTE-A's standardization, research about coordinate multi point reception / transmission (CoMP) is very popular. However, topics about CoMP were freezed in around 2009 by 3GPP, so further research and performance analysis about key techniques in CoMP is very little. In this paper, we studied the dynamic cell selection method which is presented in some proposals [1],...
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