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In this paper, we propose a compact wideband antenna. The operation band of the antenna covers from 3 GHz to 30 GHz with dimensions of 25 mm× 25 mm. The measured antenna S-parameters are in good agreement with the simulated ones. Furthermore, based on the proposed wideband antenna, a two-element multiple-input-multiple-output (MIMO) antenna with high isolation is developed due to its orthogonal polarization...
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...
Exploiting multiple-input–multiple-output (MIMO) techniques by using massive antennas can significantly improve the capacity and reliability of wireless systems and has been considered as one key technique in future fifth-generation mobile communications system. Considering the limitation of antenna panel size, placing the massive antennas in 2-D grid is an effective way for its commercialization,...
Millimeter-wave fifth-generation (5G) systems will extensively leverage massive multiple-input multiple-output (MIMO) architectures to improve their link performance. These array systems will employ many power amplifiers (PAs) operating at moderate output power (Pout), e.g., 16 PAs each with +7dBm Pout [1]. The PA energy efficiency is of paramount importance in MIMO systems for improved battery life...
This paper presents an ultra-broadband ultracompact Butler Matrix design scheme. The design employs stacked transformer based couplers and lumped LC π-network phase shifters for substantial size reduction. As a proof-of-concept design, a 4×4 Butler Matrix is implemented in a standard 130nm bulk CMOS process at a center frequency of 2.0 GHz. Compared with reported fully integrated 2.0 GHz 4×4 Butler...
3D-MIMO, using two dimensional antenna array at base station, demonstrates promising throughput gain over conventional antenna system during recent academic and industry studies. To realize the performance gain, accurate channel state information (CSI) feedback is one essential aspect. However, traditional feedback method, either codebook based or reciprocity based, suffers from overhead and partial...
In this paper, a novel compact high isolation Wireless local area network (WLAN) multiple-input-multiple-output (MIMO) antenna based on composite right-/left-handed (CRLH) is proposed. The antenna performance and field distribution are studied through simulation. The results prove that this new method can realize high isolation between antenna elements with nearly no influence on its radiation performance...
3D-MIMO, using two dimensional antenna array at base station, demonstrates promising throughput gain over conventional antenna system during recent academic and industry studies. To realize the performance gain, accurate channel state information (CSI) feedback is one essential aspect. One effective way to obtain this CSI is taking advantage of channel reciprocity between uplink and downlink in TDD...
In this paper, the design of an ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna based on metamaterial is proposed. The antenna is designed to achieve dual band-notched and high isolation using metamaterials. The traditional split ring resonators (SRRs) are used to achieve the band-notched effect and a new type of SRR is used to reduce the mutual coupling at both 3.1 GHz and 10 GHz...
Multiple-input multiple-output radar uses multiple antennas at both the transmitter and receiver to improve the detection performance. In this paper, the problem of target detection with unknown parameters is considered for MIMO radars. We derive the close-form of the probability of detection and the probability of false alarm for the MIMO radar system with unknown parameters in totally correlated...
Abstract-Single and Multi-layer adaptive eigen based beamforming (EBB) has been proved to be a promising method to achieve the tradeoff between diversity and spatial multiplexing. But the CQI in multi-layer mode is calculated according to the CQI in single-layer mode. Lack of accurate multi-layer CQI will induce performance loss when implementing layer adaptation at eNodeB. In this paper, aiming to...
The virtual MIMO (V-MIMO) and coordinated multipoint transmission (CoMP) are adopted by the LTE system to extend the uplink spectral efficiency. V-MIMO makes use of spatial multiplexing to increase system throughput while CoMP by means of mitigating inter cell interference (ICI) significantly achieve the same effect. In this paper, we present an orthogonality based proportional fair scheduling (OPF)...
In LTE downlink multiple-input multiple-output (MIMO), eigen based beamforming (EBB) is a promising approach for single-user scenario, while block diagonalization based beamforming (BDBF) eliminates intra-cell interferences significantly for multi-user scenario. However, both of them neglect inter-cell interferences which may lead system performance degradation. This paper presents an interference...
Multiple-input multiple-output (MIMO) technology can provide high data rate and substantial diversity. Space time block code (STBC) provides diversity gain and obtains signal of better quality even under bad channel conditions. However, it has no contribution to system average throughput. Vertical-bell laboratory layered space-time (VBLAST) improves peak data rate but leads to higher packet error...
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