نتایج جستجو برای: wireless fdma network

تعداد نتایج: 731874  

2009
Syed S. Rizvi Khaled M. Elleithy Aasia Riasat

In the present scenario, improvement in the data rate, network capacity, scalability, and the network throughput are some of the most serious issues in wireless mesh networks (WMN). Specifically, a major obstacle that hinders the widespread adoption of WMN is the severe limits on throughput and the network capacity. This chapter presents a discussion on the potential use of a combined orthogona...

Journal: :CoRR 2013
Nadeem Javaid I. Israr Mahmood Ashraf Khan Akmal Javaid Safdar Hussain Bouk Zahoor Ali Khan

This paper presents comparison of Access Techniques used in Medium Access Control (MAC) protocol for Wireless Body Area Networks (WBANs). Comparison is performed between Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), Pure ALOHA and Slotted ALOHA (S-ALOHA). Performance metrics used for comparison ...

Journal: :Computer Networks 2016
Eirini-Eleni Tsiropoulou Aggelos Kapoukakis Symeon Papavassiliou

SC-FDMA has been selected by the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) and LTE Advanced (LTE-A), as the primary multiple access scheme for the uplink of the 4 G wireless communication systems. This article surveys the different stateof-the-art resource allocation algorithms developed to allocate system’s subcarriers and users’ transmission powers in the uplink of...

2007
A. Wilzeck Q. Cai M. Schiewer T. Kaiser

SC-FDMA with dynamic bandwidth assignment was chosen as uplink transmission scheme for the Long Term Evolution (LTE) of the 3GPP UMTS standard [1]. In this contribution we focus on the extension of the Single-Carrier Frequency Division Multiple Access (SC-FDMA) scheme to a MultipleInput Multiple-Output (MIMO) SC-FDMA scheme employing spatial multiplexing and dynamic bandwidth assignment. In the...

Journal: :IEEE Internet of Things Journal 2023

This paper investigates the information freshness of Industrial Internet Things (IIoT) systems, where each IoT device makes a partial observation common target and transmits update to central receiver recover complete observation. We consider age collection (AoC) performance as measure freshness. Unlike conventional (AoI) metric, instantaneous AoC decreases only when all cooperative packets for...

2017
Wei Peng Fumiyuki Adachi

The target data rate for the next generation wireless communication network will be around 1Gbps. To realize such a high data rate transmission, broadband transmission has been used in the current wireless communication network and it is also going to be employed by the next generation network. Due to the multi-path fading with large delay spread, broadband wireless channel is characterized by ...

Nowadays wireless networks are becoming important in personal and public communication andgrowing very rapidly. Similarly, Software Dened Network (SDN) is an emerging approach to over-come challenges of traditional networks. In this paper, a new SDN-based framework is proposedto ne-grained control of 802.11 Wireless LANs. This work describes the benets of programmableAcc...

2011
Jaswinder Singh

Fiber-optic CDMA is an emerging technology with far more advantages than the conventional TDMA and FDMA techniques. The only limitation of FO-CDMA is the multiple access interference among the users simultaneously accessing the network. This paper reviews the techniques proposed in the literature for the reduction of multiple access interference (MAI) between the users simultaneously accessing ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1390

استفاده از شبکه های ارتباطی بیسیم به جای سیم کشی نقطه به نقطه، در سال های اخیر بسیار مورد توجه قرار گرفته است. دسته ای از پژوهش ها و کاربردهای صنعتی بکارگیری شبکه های بیسیم را برای جمع آوری داده های سنسوری (data aggregation) و پایش (monitoring) وضعیت فرآیند توسعه داده اند و از آن با عنوان "شبکه حسگر بیسیم" (wireless sensor network) یا به اختصار wsn یاد می کنند. امروزه مفهوم "شبکه حسگر- عملگر بی...

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