orthogonal frequency division multiplexing for wireless communications

... friend Mona Alsayigh for her assistance Not forgetting also, my examiners and all committee members for their helpful suggestions iv ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) ... INTERPOLATION METHOD FOR CHANNEL ESTIMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM USING PILOT SIGNALS AHMED NOORI HUMMADI THESIS SUBMITTED IN FULFILMENT FOR THE DEGREE OF ... performance based on QPSK Modulation 83 4.4 The OFDM systems performance based on DBPSK Modulation 85 4.5 The OFDM systems performance based on DQPSK Modulation 87 4.6 The OFDM systems performance

Ngày tải lên: 26/05/2013, 21:28

... EURASIP Journal on Wireless Communications and Networking Volume 2006, Article ID 91329, Pages 1–12 DOI 10.1155/WCN/2006/91329 High-Speed Turbo-TCM-Coded Orthogonal Frequency- Division Multiplexing ... channel using orthogonal frequency division multiplexing, ” IEEE Transactions on Communications, vol 33, no 7, pp 665– 675, 1985 [5] A Batra, et al., “Multi-band OFDM physical layer proposal for IEEE ... (ISI) caused by multipath channels are equalization and orthogonal frequency- division multiplexing (OFDM) [4] OFDM is a promising solution for efficiently capturing multipath energy in highly dispersive

Ngày tải lên: 22/06/2014, 22:20

... Pietikäinen Communications Laboratory / HUT S-72.333 Postgraduate Course in Radio Communications Kari Pietikäinen Communications Laboratory / HUT S-72.333 Postgraduate Course in Radio Communications Orthogonal ... Communications Orthogonal Frequency Division Multiplexing Kari Pietikäinen kari.pietikainen@hut.fi Postgraduate Course in Radio Communications 30.11. Kari Pietikäinen Communications Laboratory ... components • Pilots are designed for easy detection • Pilots are used for channel estimation – Frequency and phase offsets – Can be used for synchronization Kari Pietikäinen Communications Laboratory

Ngày tải lên: 11/07/2014, 20:21

... thiết kế phần cứng 2.2 Sự khác nhau giữa OFDM và FDM (Frequency Division Multiplexing) Kỹ thuật ghép kênh theo tần số FDM (Frequency Division Multiplexing) làtruyền đồng thời các tín hiệu nhánh ... hóa, kinh tế, chính trị, khoa học kỹ thuật rất đa dạng và phong phú Kỹ thuật OFDM (Orthogonal Frequency Division Multiplexing) đã từng là một bước đột phá quan trọng trong lĩnh vực truyền dẫn dữ ... như truyền hình vệ tinh 1.4 Tương lai phát triển của kỹ thuật OFDMCông nghệ OFDM (Orthogonal Frequency Division Multiplexing) đã và đang chứng minh vai trò quan trọng trong việc truyền dẫn dữ liệu

Ngày tải lên: 20/08/2024, 15:07

... television Coded Orthogonal Frequency Division Multiplexing • Need for a good transmission technique • Explanation of the different parts • Coded • Frequency Division Multiplexing • Orthogonal ... Mb/s in 7 MHz • Developed for 8 MHz channels – A 7 MHz variant has been produced and tested • Can use single frequency networks - SFNs • New technology with scope for continued improvement ... receiver bandwidths proposed. – 500 kHz portable / mobile for sound and data – 5.6 MHz fixed / mobile for SDTV and LDTV – 5.6 MHz fixed for HDTV • Individual band segments can be allocated to

Ngày tải lên: 09/07/2014, 08:16

... Lab Wireless Access Tech Lab Frequency Division Multiple Access (FDMA) (2) Allocation of separate channels to FDMA signals CCU Wireless Access Tech Lab Wireless Access Tech Lab Frequency Division ... a forward time slot and a reverse time slot to facilitate bidirectional communication CCU Wireless Access Tech Lab Wireless Access Tech Lab Introduction (4) CCU Wireless Access Tech Lab Wireless ... Techniques for Wireless Communications 2005/07/06 Weng Chien-Erh Wireless Access Tech Lab Table of Contents(1) Introduction FDMA TDMA CDMA SS (Spread Spectrum)  FHSS  DSSS  Hybrid CCU Wireless

Ngày tải lên: 11/07/2014, 21:20

... fourth 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 ... Fourier transform (DFT)-spread OFDMA The data is passed through a DFT block before being input to the Nhóm OFDMA module USE OF OFDMA IN WIMAX AND LTE USE OF FREQUENCY DIVERSITY subcarriers for OFDM ... Orthogonal Frequency Division Multiple Access in WiMAX and LTE: A Comparison S Srikanth and P A Murugesa Pandian,

Ngày tải lên: 24/07/2015, 22:26

... 1024 sóng mang 1/3 ( khơng có bảo vệ sóng mang con) sử dụng cho truyền dẫn preamble Performance Bounds For Syschronization and Channel Estimation Thông thường, ước lượng kênh WiMax sử dụng preamble ... hiệu suất kịch Cả LTE WiMAX có nhấn mạnh vào việc sử dụng kỹ thuật HARQ để xử lí điều kiện kênh wireless [1, 2] Sử dụng phân tập đa người dùng Trong kịch điển hình, người dùng sử dụng tần số chọn ... nghệ Tuy nhiên, tài sản mạng lưới khối lượng sản phẩm đóng vai trị quan trọng lựa chọn hệ thông wireless 4G nhà khai thác mạng Như đề cập trước đó, hầu hết nhà khai thác mạng ưu thích LTE WiMAX

Ngày tải lên: 24/07/2015, 22:27

... station CDMA code division multiple access MSE mean square error CFO carrier frequency offset OFDM orthogonal frequency division multiplexing CP cyclic prefix OFDMA orthogonal frequency division multiple ... time division multiple access MF matched filtering WiMAX worldwide interoperability microwave access viii Summary In current broadband evolution of wireless communications, Orthogonal Frequency Division ... DFT discrete 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

Ngày tải lên: 14/09/2015, 14:03

... SPECTRUM EFFICIENCY FOR WIRELESS COMMUNICATIONS FROM SOURCE TO MEDIA-BASED MODULATION (INVITED PAPER) Tran Xuan Nam* Abstract: Spectrum is a scarce resource for wireless communications During ... ubiquitous wireless networks Increase in wireless networks and devices would result in a scarcity of carrier frequencies for transmission due to limited frequency spectrum Various efforts have ... diversity technique for wireless communications, " IEEE J on Select Areas in Commun., Vol 16, No.8 (1998), pp 1451-1458 [7] D J Love, R.W Heath, and T Strohmer "Grassmannian beamforming for multipleinput

Ngày tải lên: 10/02/2020, 02:52

... Monolithic Technology for Wireless Communications: GaN MMIC Power Amplifiers For Microwave Radios Vittorio Camarchia *, Marco Pirola and Roberto Quaglia Department of Electronics and Telecommunications, ... lower band (7 GHz): the best performance in the upper band is measured at 14.9 GHz At GHz, a frequency shift of the center frequency is experienced, and the best performance is measured at 7.7 GHz ... state-of-the art performance at device level and for discrete transistors, but monolithic implementations are still limited to few examples [4] However, GaN on SiC is dedicated to high-performance applications,

Ngày tải lên: 24/11/2022, 17:57

... Delay Diversity CDMA Code Division Multiple Access DFT Discrete Fourier Transform FDE Frequency Domain Equalizer FDMA Frequency Division Multiple Access FEC Forward Error Correcting ... TDMA/FDMA based Global System for Mobile Communications (GSM), which was first... systems, multiple access technologies based on orthogonal frequency division multiplexing (OFDM) air interface ... the popular orthogonal frequency division multiple access (OFDMA) is chosen while single carrier frequency division multiple access (SC-FDMA), which uses similar wireless air

Ngày tải lên: 08/09/2015, 18:24

... implementation 6 Emerging Communications for Wireless Sensor Networks Opportunistic wireless links: In the formation of abstract wireless links, both the occupied spectrum and participating wireless nodes ... Emerging Communications for Wireless Sensor Networks Edited by Anna Förster and Alexander Förster Emerging Communications for Wireless Sensor Networks Edited by Anna ... Hardware/SDK based on EWI Emerging Communications for Wireless Sensor Networks An implementation of the EWI architecture for wireless sensor networks, including hardware platform and SDK (Software Development

Ngày tải lên: 20/06/2014, 06:20

... Antennas for Cellular Coverage from a High Altitude Platform IEEE Transactions on Wireless Communications, 2, No 3, 484-492 Tozer, T C., & Grace, D (2001) High-Altitude Platforms for Wireless Communications ... Protocols for Wireless Sensor Networks: A Survey IEEE Communications Magazine Elabdin, Z., Elshaikh, O., Islam, R., Ismail, A P., & Khalifa, O O (2006) High Altitude Platform for Wireless Communications ... M., & Miura, R (2008) Advanced Communications Techniques and Applications for High-Altitude Platforms Editorial for a Special Issue, EURASIP Journal on Wireless Communications and Networking,

Ngày tải lên: 20/06/2014, 06:20

... driven code 64 Emerging Communications for Wireless Sensor Networks generation is used to furthermore... wake-up scheme 72 Emerging Communications for Wireless Sensor Networks ... Emerging Communications for Wireless Sensor Networks A Survey of Low Duty Cycle MAC Protocols in Wireless Sensor Networks. .. Sankarasubramaniam, Y & Cayirci, E (2002) Wireless ... hypotheses. Actually, information can be gathered by adding log actions to the test case model, which logs the Emerging Communications for Wireless Sensor Networks54 needed information. Thus, we

Ngày tải lên: 20/06/2014, 06:20

... cluster-based [...]... Architecture for Wireless Microsensor Network, IEEE Journal on Wireless Communications, Vol 1 Hill, J & Culler, D (2002) A Wireless Platform for Deeply Embedded Networks ... MAC for Wireless Sensor. .. Performance Analysis of IEEE 802. 15. 4 and Zigbee for Large-scale Wireless Sensor Network Applications, Proceedings of ACM International Workshop on Performance ... Protocols and Architectures for Wireless Sensor Networks, pp 111-148, John Wiley & Sons, 978-0-470-0 951 0-2, West Sussex, England 90 Emerging Communications for Wireless Sensor Networks

Ngày tải lên: 20/06/2014, 06:20

... Energy-Saving MAC for Wireless Body Sensor Networks in Healthcare Systems, IEEE Journal on Selected Areas in Communications (JSAC) - Wireless and Pervasive Communications for Healthcare, June ... qp is straightforward In Figure 6 we report qp , q1 , q2 , q3 , q4 130 Emerging Communications for Wireless Sensor Networks ¯ As for qM... , n Instead, sensors are uniformly and randomly ... Random Access Protocol) for local wireless communications, Proceedings of Wireless& apos;93, pp. 625-635, Calgary, Canada, July 1993. Mendel, J.M. (1995). Fuzzy Logic Systems for Engineering: A Tutorial,

Ngày tải lên: 20/06/2014, 06:20

... Emerging Communications for Wireless Sensor Networks156 However, first of all we should update (29) to incorporate to the formula the information ob- tained from neighboring nodes and thus, define a formula ... worth Emerging Communications for Wireless Sensor Networks158 re-stressing that we are not proposing a new routing algorithm but a forwarding scheme with a selective mechanism and therefore, this ... Selective Communications in Sensor Networks 157 However, first of all we should update (29) to incorporate to the formula the information ob- tained from neighboring nodes and thus, define a formula

Ngày tải lên: 20/06/2014, 06:20

... spatial relationships as well. Space -Frequency Transform Map For a static channel, we may extend the time -frequency transform map in Figure 2.9 for the space -frequency relationships shown in Figure ... capacity for data transmission of current wireless systems is still tiny when compared to wired forms of communications. But wireless data rates continue to increase. To understand the push for higher ... these definitions. |h( )|f ~ frequency, f f c B c Frequency Selectivity V 0 Figure 2.6: Example of a frequency- varying channel. The loss of frequency coherence in a wireless communications system is...

Ngày tải lên: 20/11/2012, 11:36

... ground fixed/mobile platform, and (3) the space platform. 4 RF MEMS Circuit Design for Wireless Communications Information  Voice  Broadband data  Messaging  Navigation  DBS  Internet  Video Wireless ... Design for Wireless Communications 86% 11% 3% 2000 81% 15% 4% 2001 75% 20% 5% 2002 70% 25% 5% 2003 Phone line Power line Wireless Figure 1.4 Distribution of interconnection media usage for home ... microwave circuit design. Chapter 1 of RF MEMS Circuit Design for Wireless Communications starts by clearly stating the ubiquitous wireless communications problem, in particular, as it relates to the...

Ngày tải lên: 19/01/2014, 20:20