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Massive MIMO is a key technique for next generation wireless networks due to its potential for significant capacity improvement. To achieve good performance, accurate channel state information (CSI) is needed, especially at the transmitter, to calculate the beamforming matrices. This problem exists for traditional MIMO systems and becomes more challenging for Massive MIMO as the number of antennas...
Small cell networks (SCN) and massive MIMO are both promising techniques for improving the network capacity. In this paper, we consider applying both concepts for indoor communications based on a radio-over-fiber (RoF) infrastructure. We give a comparison of the achievable sum-rates using the same system configurations which include the same set of active antennas and the same power constraints. The...
In 802.11 standard, meager effort has been invested towards devising energy efficient WLAN communication. Especially with the massive deployment of centralized enterprise WLAN (CE-WLAN), in indoor networks, a lot of access points (APs) are densely packed for increasing the capacity offered. But most of the APs deployed are idle for a larger period of time over a day. This paper proposes to use a centralized...
The 60 GHz unlicensed frequency band has been adopted to support high data rate WLAN applications. The problem of this frequency band is that the wireless signal is vulnerable to the shadowing of objects. Especially in indoor scenarios, humans may frequently block the signal paths that cause disconnections of devices. This problem can be mitigated by using multiple antennas that can create rich signal...
Large MIMO is a new and promising technique for boosting wireless link capacity. Currently, the research of large MIMO focuses on the theoretical aspects while work on the practical implementations and analysis are very limited. In this paper, we present some critical investigations on the behaviors of large MIMO in real propagation environment based on extensive channel measurements. On the one hand,...
Radio over Fiber (RoF) based IEEE 802.11x (where x can be a, b, g, n, ac) Fiber Wireless (Fi-Wi) LANs are being thought of as a better solution towards deployment of Enterprise WLAN. It provides optimized load distribution among Access Points (APs) and also better efficient power management of the overall network. In most of the existing works about WLAN deployments, the classical models characterizing...
As more bandwidth hogging applications like video streaming or video conferencing are entering the telecom market, indoor networks need to be more efficient, failure-resilient and flexible. WiFi have predominantly been the most ubiquitous indoor wireless technology. WiFi Access Points (APs) are placed progressively in indoor locations resulting in highly congested ISM spectrum bands. Thus users are...
Indoor downlink communication contributes to a large part of the data traffic generated in today's world. The demand for high rate wireless indoor coverage while providing complete support to the existing wireless technologies is a big challenge. The future proof centralized optical fiber indoor back haul for efficient indoor coverage is gaining a lot of attention recently. Physical layer techniques...
Radio-over-fiber (RoF) technology is a promising candidate to provide high data rates and ubiquitous coverage by distributing small cells over the service area. For wireless LAN (WLAN) application in RoF systems, an access points (AP) can be shared among multiple small cells. The medium access mechanisms in the distributed coordination function (DCF) under this context encounter some issues due to...
Indoor downlink communication contributes to a large part of the data traffic generated in today's world. Enormous high data rate supporting devices are entering todays market. They demand for high rate wireless indoor coverage for their uninterrupted service. The main challenge lies in working with the existing wireless technologies while providing a future proof centralized optical fiber indoor...
Successive Interference Cancellation (SIC) is a well-known technique for enhancing wireless channel efficiency by allowing concurrent transmissions from multiple users. This multiuser detection technique is usually used in cellular systems. In this paper we adapt it to Radio-over-Fiber (RoF) system for the same purpose. Due to the similarity to using SIC in typical cellular networks, we mainly focus...
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