Channel assignment with transmission power optimization method for high throughput in multi-access point WLAN

2015 ◽  
Author(s):  
Amit Kachroo ◽  
Junhyuk Park ◽  
HyungWon Kim
Keyword(s):  
High Throughput ◽  
Channel Assignment ◽  
Power Optimization ◽  
Access Point ◽  
Optimization Method ◽  
Transmission Power ◽  
Multi Access

Transmission Power Optimization of Concurrently Communicating Two Access Points in Wireless Local Area Network

2020 ◽  
Vol 11 (4) ◽  
pp. 1-25
Author(s):  
Hendy Briantoro ◽  
Nobuo Funabiki ◽  
Minoru Kuribayashi ◽  
Kwenga Ismael Munene ◽  
Rahardhita Widyatra Sudibyo ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Power Optimization ◽  
Local Area Network ◽  
Access Point ◽  
Local Area ◽  
Raspberry Pi ◽  
Area Network ◽  
Transmission Power ◽  
Wireless Internet ◽  
Coverage Area

Currently, the IEEE 802.11 wireless local-area network (WLAN) has been prevalent around the world due to the advantages of mobility, flexibility, and scalability. WLAN offers the wireless internet-access method through an access-point (AP) at homes, schools, or offices. When multiple APs are deployed in the network field, the proper transmission power of each AP is essential to improve the performance, considering the coverage area, transmission capacity, and interference. In this paper, the authors study the transmission power optimization of concurrently communicating two APs in WLAN. Based on extensive experiment results, the authors propose a method of selecting the best power for each AP from the signal-to-noise ratio (SNR) of receiving signal strength (RSS). For evaluations, the authors implemented the proposed method on the elastic WLAN system testbed using Raspberry Pi for APs and conducted experiments for nine network topologies in two buildings at Okayama University. The results show that the proposal always selects the best power in any topology.

Lightbeam Configuration Method and Interference Elimination Resource Scheduling for Indoor Multibeam VLC Networks

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Cong-Nam Tran ◽  
Nam-Hoang Nguyen ◽  
Trong-Minh Hoang
Keyword(s):  
Transmission Rate ◽  
Resource Scheduling ◽  
Packet Delay ◽  
Access Point ◽  
Visible Light Communications ◽  
Resource Allocation Algorithm ◽  
Downlink Transmission ◽  
High Data ◽  
Interference Elimination ◽  
Multi Access

AbstractVisible light communications (VLC) is considered as an alternative communications technology for providing indoor wireless services. VLC systems are expected to offer high data transmission rate and seamless coverage. In order to achieve these requirements, VLC systems utilizing multi-lightbeam access points (multibeam VLC-AP) for downlink transmission have been proposed recently. In this paper, we present a lightbeam configuration method and an interference elimination resource scheduling mechanism (IERS) for indoor multibeam multi-access point VLC systems. The proposed lightbeam configuration method ensures seamless connectivity between user equipment and VLC-AP. The proposed IERS mechanism consists of a beam assignment algorithm and a resource allocation algorithm for eliminating co-channel interference as well as improving system performance. Performance results obtained by computer simulation indicate that there are significant improvements in terms of downlink signal to interference plus noise ratio, user throughput and packet delay when the proposed IERS mechanism is deployed.

Automated seeding for the optimization of crystal quality

2010 ◽  
Vol 43 (4) ◽  
pp. 752-756 ◽  
Author(s):  
Sahir Khurshid ◽  
Lesley F. Haire ◽  
Naomi E. Chayen
Keyword(s):  
High Throughput ◽  
Structural Genomics ◽  
Optimization Method ◽  
Crystal Quality ◽  
Routine Manner

With the advent of structural genomics a variety of crystallization techniques have been automated and applied to high-throughput pipelines, yet seeding, which is the most common and successful optimization method, is still being performed predominantly manually. The aim of this study was to devise simple automated seeding techniques that can be applied in a routine manner using existing robots and not requiring special tools. Two alternative protocols for automated seeding experiments are described. One involves the delivery of microcrystals from stock to target wells using the robot dispensing tip as a seeding tool. The second harnesses an animal whisker as the seeding tool. Larger and better ordered crystals were obtained using both techniques.

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