space division multiple access for wireless local area networks

... the Outage-Constrained Capacity Regionof Space-Division Multiple-Access Radio Systems Haipeng Jin Center for Wireless Communications, University of California, San Diego, 9500 Gilman Drive, La ... MIMO multiple-access channel The ergodic capacity region for MIMO multiple-access channel with covariance feedback has been studied in [13] In this paper, we consider the outage capacity region for ... cases with multiple users The outage capacity issue for single-user multiple-input multiple-output (MIMO) case was studied extensively In [1], the authors characterized the outage capacity for a point-to-point

Ngày tải lên: 23/06/2014, 01:20

... decided to merge the work onRadio Local Loop and Radio LANs through the formation of Broadband Radio AccessNetworks (BRAN) This project aims to specify standards for Wireless ATM (HIPERLANTypes 2, ... the uncabled area tothe organization’s wired network This application area of WLANs is referred to as LANextension.Another area of WLAN application is nomadic access It provides wireless connectivitybetween ... were designed forwire-based networks Most of these protocols degrade significantly when used over a wirelesslink TCP for example was designed to provide reliable connections over wired networks Itsefficiency,

Ngày tải lên: 29/09/2013, 21:20

... networks became more crowded A solution to the problem was necessary Figure 2 Hub-Based Twisted Pair Ethernet Ted Rohling, Global Knowledge Instructor, CISSP The Case for Virtual Local Area Networks ... architecture using an access method known as Carrier Sense Multiple Access with Collision Detection or CSAM/CD A simple contention protocol, CSMA/CD required that stations “listen” for transmissions ... Trang 1The Case for Virtual Local Area Networks (VLANs) Expert Reference Series of White Papers Trang 2In the history of Ethernet,

Ngày tải lên: 17/01/2014, 06:20

... As wireless networking grows in popularity, various radio access technologies have been developed to provide bet-ter environment for user data service Most of all, IEEE 802.11 Wireless Local Area ... 2009 Recommended by Naveen Chilamkurti We propose a MAC layer handoff mechanism for IEEE 802.11 Wireless Local Area Networks (WLAN) to give benefit to bandwidth-greedy applications at STAs The proposed ... IEEE 802.11 Wireless Local Area Networks SungHoon Seo,1JooSeok Song,1Haitao Wu,2and Yongguang Zhang2 1 Department of Computer Science, Yonsei University, Seoul 120-749, South Korea 2 Wireless and

Ngày tải lên: 21/06/2014, 23:20

... AWARE RF TRANSCEIVER FOR WIRELESS BODY AREA NETWORKS (WBAN) M.KUMARASAMY RAJA NATIONAL UNIVERSITY OF SINGAPORE 2011 Trang 2ENERGY AWARE RF TRANSCEIVER FOR WIRELESS BODY AREA NETWORKS (WBAN) ... Publications 109 BIBLIOGRAPHY 110 Trang 7SUMMARY Transceivers for wireless body area networks (WBAN) are expected to consume low power for long battery life or to operate from other limited power ... Characterizing PCB for the OOK transmitter Right side is for characterizing the test chip 1 and the left portion is for characterizing the rest of the two test chips Components are populated for only the

Ngày tải lên: 09/09/2015, 18:49

... define new wireless standards Physical (PHY) and Medium Access Control (MAC) layers for WBAN The IEEE 802.15 Task Group 6 defines a MAC layer and a few supporting PHY layers for Body Area Networks ... Intrabody Communication System for Wireless Body Area Networks Zibo Cai College of Engineering and Science Victoria University Submitted in Fulfillment of the Requirements For the Degree of Master ... power consumption and interference with other wireless networks Another option for achieving high data rate is to wisely choose modulation and multiple access techniques Communication system design

Ngày tải lên: 28/11/2015, 14:02

... Control ProtocolTDMA Time Division Multiple AccessTPC Transmit Power Control TX TransmitterWLAN Wireless Local Area NetworkWPAN Wireless Personal Area Network WM Wireless Media Trang 24List of SymbolsSee ... WiMAX(Wireless Microwave Access) This group develops Wireless MetropolitanArea Networks (WMANs) which were in the beginning designed for thewireless interconnection of buildings and stationary wireless ... Management Methods for Wireless Local Area Networks, DOI 10.1007/978-3-8348-9738-1_2, © Vieweg+Teubner Verlag | Springer Fachmedien Wiesbaden GmbH 2010 Trang 33• 802.16 Broadband Wireless Access This

Ngày tải lên: 15/01/2018, 11:08

... keying (QPSK) Sophisticated multiple access technology like frequencydivision multiple access (FDMA), time division multiple access (TDMA) andcode division multiple access (CDMA) also gained prominent ... CDMA Code Division Multiple Access DFT Discrete Fourier Transform FDE Frequency Domain Equalizer FDMA Frequency Division Multiple Access FEC Forward Error Correcting FFT Fast Fourier Transform FSTD ... Performance Comparison for ZF QRD and MMSE QRD 46 2.9 BER Performance Comparison for Varying M 47 2.10 BER Performance for P = 8 . 49 2.11 BER Performance for P = 16 . 49 2.12 BER Performance

Ngày tải lên: 08/09/2015, 18:24

... ĐẠI HỌC BÁCH KHOA HÀ NỘI KHOA ĐIỆN TỬ VIỄN THÔNG ––––––––––––––––– Computer Networks Seminar Đề tài: Wireless Local Area Network Sinh viên thực hiện : ĐỖ VIỆT THANH LÝ HOÀI NAM Lớp : ... CỦA WLAN 5 CÔNG NGHỆ TRONG WLAN Trang 31 TỔNG QUAN Mạng LAN không dây viết tắt là WLAN (Wireless Local Area Network), là một mạng dùng để kết nối hai hay nhiều máy tính với nhau mà không sử dụng ... Institute of Electrical and Electronic Engineers (IEEE) phác thảo chuẩn 802.11 cho WLANs (Wireless Local Area Networking) WLAN là mạng cục bộ không dây cho phép kết nối không dây ethernet hoạt

Ngày tải lên: 01/09/2013, 10:30

... to the case without MAI We therefore obtain a quasiorthogonal multiple access without the need for orthogonal design—even for frequency-selective fading channels For convenience, we refer to some ... following results for perfect channel knowledge As observed before, the bit error performance again im-proves for higher fading rates Note that the bit error perfor-mance degrades for higher pilot-layer ... with-out the need for spreading sequences has been proposed In this technique, data separation is based on chip-level interleavers Therefore we refer to it as interleave-division multiple access (IDMA)

Ngày tải lên: 22/06/2014, 23:20

... signal, performance is essentially unaffected Trang 370 CODE DIVISION MULTIPLE ACCESS (CDMA)10 − 3 10 − 2 10 − 1 10 0 Users Upper bound Lower bound Simulated FIGURE 2.33: System performance for FHMA ... 2SPREAD SPECTRUM TECHNIQUES FOR CODE DIVISION MULTIPLE ACCESS 69where P2is the probability of any two users hopping to the same frequency in the same symbol duration For independent random hop ... desired signal due to fading) The performance of a wireless link can be viewed in terms of either its average BER value or Trang 8CELLULAR CODE DIVISION MULTIPLE ACCESS 75the probability that the

Ngày tải lên: 07/08/2014, 21:20

... spectrum waveforms are also used in distributed packet networks Such networks tend to use random access or other contention-based protocols for channel access Spread spectrum can benefit such networks ... enhanced multiple access capabilities Additionally, in distributed packet networks, spread spectrum also offers an advantage over narrowband systems by providing the capture effect, which allows for ... should be noted that when spread spectrum waveforms are used in such networks, the technique is typically referred to as spread spectrum multiple access (SSMA) as opposed to CDMA [1] As the chapter

Ngày tải lên: 07/08/2014, 21:20

... the capacity of CDMA systems As a result, capacities for single-cell CDMA systems can be substantially lower than those fororthogonal multiple access techniques such as TDMA or FDMA In addition, ... the performance advantage of the optimal receiver compared to the conventional matchedfilter in such a scenario? that maximizes (5.17) for every bit interval A closed form expression for the ... treats multiple accessinterference (MAI), which is inherent in CDMA, as if it were additive noise because, afterdespreading, the MAI tends toward a Gaussian distribution (see Chapter 2 for details)

Ngày tải lên: 07/08/2014, 21:20

... it plots BER performance averaged over all users. For most of the detectors, the performance of any specific user is equal to the average performance. However, this is not true for the successive ... in complex baseband form (i.e., after demodulation) in Figure 5.7. P1: IML/FFX P2: IML MOBK023-05 MOBK023-Buehrer.cls September 28, 2006 15:56 148 CODE DIVISION MULTIPLE ACCESS (CDMA) r ( t ) ... couldn’t be usedto perform a second round (i.e, stage) of cancellation before making a decision. In fact, cancellation could be performed an arbitrary number of times before a final decision is

Ngày tải lên: 07/08/2014, 21:20

... than subtracted from the combined received signal Cancellation, there-fore, is performed on a PCG-by-PCG basis Before performing cancellation, we must first determine whether or not each user’s ... pp 134–140, September 1990 [11] V Bhargavan, “MACAW: A media access protocol for wireless LAN,” in Proceedings of the Association for Computing Machinery Special Interest Group on Data Communications, ... is performed However, the final decision on voice rate is still not made until after decoding Power control and forward error control (FEC) coding are essential parts of IS-95 It is, therefore,

Ngày tải lên: 07/08/2014, 21:20

... Frequency Division Multiple Access in WiMAX and LTE: A Comparison Group 4 – Trang 2 INTRODUCTION USE OF OFDMA IN WIMAX AND LTE  NETWORK ENTRY STEPS IN WIMAX AND LTE  PERFORMANCE BOUNDS FOR ... IMT-Advanced criterion for 4G wireless systems. WiMAX to WiMAXv2 Base on the IEEE 802.16m standard Forming fixed size physical resource units (PRUs) Forming distributed and contiguous localized resourceunits ... generation (4G) wireless landscape. - Both LTE and WiMAX standards use several common technologies with subtle differences.The main common technology is orthogonal frequency-division multiple access

Ngày tải lên: 24/07/2015, 22:26

... different channelaccess schemes, such as carrier sensing multiple access with collision avoidance(CSMA/CA), ALOHA and time division multiple access (TDMA) Thus it takes 3 Trang 20time for designers ... event-drivensimulator for wireless sensor networks, body area networks and general networks of low-power embedded devices [22] The simulator is developed by Australia’sInformation Communications ... and shorterdata packets with fixed length BLE combines the frequency division multiple access(FDMA) and time division multiple access (TDMA), which makes it more robust tointerference and collisions

Ngày tải lên: 09/09/2015, 08:16

... Typical OFDM-based multiple access techniques include Time Division Multiple Access (OFDM-TDMA), Code Division Multiple Access (OFDM-CDMA or MC-CDMA) and Frequency Division Multiple Access (OFDM-FDMA) ... Fourier transform P/S parallel to sequential FDMA frequency division multiple access QPSK quaternary phase shift keying FFT fast Fourier transform SDMA space division multiple access ICI inter-carrier ... MIMO multiple input multiple output CDMA code division multiple access MSE mean square error CFO carrier frequency offset OFDM orthogonal frequency division multiplexing multiple access

Ngày tải lên: 14/09/2015, 14:03

... ÁNH MÃ SỐ SINH VIÊN: B13DCVT148 LỚP: D13VT4 Trang 2CÁC THIẾT BỊ TRONG MẠNG KHÔNG DÂY WLAN (Wireless Local AreaNetwork) 1 Giới thiệu: - WLAN là hệ thống mạng không dây rất được ưu chuộng bởi cung ... dẫn, cáp - Thiết bị WLAN cơ bản bao gồm các card mạng không dây, các điểm truy cập không dây (Access Point), và WBridge (Bridge không dây) 1.1 Card mạng không dây - Card mạng không dây giao ... hoặc một vị trí nào đó trong phòng - Hình ảnh minh họa: Trang 31.2 Các điểm truy cập không dây (Access Point)- Các điểm truy cập không dây AP (Acsses Point) tạo ra các vùng phủ sóng, nối các

Ngày tải lên: 10/05/2017, 21:20