wireless communication systems and channel characteristics

... function for user k s channel be M Wk (Z) = αk,i Z −τk,i (1) i=1 As we can see from (1), the number of paths is M and the channel gain and delay for ith channel path are αk,i and τk,i , respectively ... packer systems with random signature sequences,” IEEE Transactions on Communications, vol 37, no 10, pp 1052–1061, 1989 [35] J C Liberti Jr and T S Rappaport, Smart Antennas for Wireless Communications: ... DS-CDMA systems, ” in Proceedings of the International Conference on Communications (ICC ’01), pp 1172–1176, Helsinki, Finland, June 2000 [26] A Papoulis and S U Pillai, Probability, Random Variables...

Ngày tải lên: 21/06/2014, 05:20

... targeted for low-cost and lowpower 60 GHz communications systems and are evaluated and compared by considering the effects of front end nonideality The authors found that OQPSK with FDE and nonfractional ... 2 EURASIP Journal on Wireless Communications and Networking system is used to compare the BER performance of both measured and modeled channels The authors conclude that the ... heterodyne architecture can enable the compact and low-cost millimeter-wave receivers for the future wireless communications systems such as the IEEE 802.15.3c wireless personal area networks (WPAN)...

Ngày tải lên: 22/06/2014, 19:20

... technology and the current state of the art in detection techniques for optical storage On the other hand, in wireless communication systems, the channel characteristics are not known a priori, and ... estimation of channel coefficients is highly important in wireless communication systems Therefore, we focus on developing channel estimation techniques for wireless communication systems The application ... other wireless communication systems Therefore, the first generation WLAN systems does not perform well because of strong interferences coming from other wireless communication systems 2.4 GHz Band...

Ngày tải lên: 14/09/2015, 14:12

... 180o narrowband and broadband baluns 20 Fig Simulated and measured output ports phase difference comparison between the 180o narrowband and broadband baluns Fig shows the simulated and measured ... broadband balun (~45%), and novel 90o broadband baluns (Type I) (~57.5%) and (Type II) (~72.46%), with wide operating bandwidths, are compared with the conventional 180o narrowband balun (~10%) and ... 180o narrowband balun 18 Fig Schematics of the proposed 180o broadband balun 19 Fig Simulated and measured input port return loss comparison between the 180o narrowband and broadband baluns 19...

Ngày tải lên: 02/10/2015, 12:56

... không liệu(lossless) Việc nén hình ảnh JPEG kỹ thuật nén liệu(lossy) số thông tin bị Kênh mã hóa (Channel coder): phải giải mã thông tin xác, lỗi phát sinh môi trường, cần phải đặt số bit bổ sung ... trường Bộ giải điều chế(Demodulator): giải điều chế thực hoạt động nghịch đảo điều chế Kênh giải mã (Channel decoder): kênh giải mã phân tích luồng bít nhận phát sửa lỗi, có, cách sử dụng liệu bổ sung ... thức, entropy H = 4.07 bit/ký hiệu Lưu ý: Hãy xem xét câu sau: "I not knw wheter this is undrstandble." Mặc dù thực tế số chữ tích câu bạn làm câu văn Nói cách khác, có nhiều khả dự phòng văn...

Ngày tải lên: 18/09/2012, 10:13

... radio systems and has been adopted by the wireless telecommunication industry for many years Driven by consumer demand for different services, the development and emergence of new wireless communication ... model where current systems such as Bluetooth, Zigbee, WiFi (IEEE 802.11b/g) and WiMAX systems operate and coexist in this band [7] Radio systems operating in the unlicensed bands are required ... imminent problem for the development of future wireless communication systems DSA will revolutionize the design of future wireless communication systems and the manner in which the radios operate...

Ngày tải lên: 11/09/2015, 09:09

... circuits, wireless communication systems have been experiencing an explosive growth in the past decades Cellular systems and Wireless Local Area Network (WLAN) are the most successful wireless ... Allocation (RRA) in wireless communication systems These techniques involve strategies and algorithms for controlling transmit power, channel allocation, modulation scheme, and error coding The ... layer performance of modern wireless communication systems as compared with single-antenna systems [17] In MIMO systems, multiple antennas are used at both the transmitter and receiver to utilize...

Ngày tải lên: 11/09/2015, 10:15

... 3.4.1 Example 1: × system with fixed channel and fixed offset 35 3.4.2 Example 2: × system, fading channel and fixed offset 40 3.4.3 Example 3: fading channel and random offset 42 Summary ... frequency offset information, channel and frequency offset estimation has become a critical component in modern wireless communication systems In conventional MIMO systems, the transmit/receive ... t=1 • hk,l and wk,l are the channel coefficient and frequency offset between the lth transmit antenna and the k th receive antenna, respectively hk,l and wk,l are assumed to be unknown and constant...

Ngày tải lên: 12/09/2015, 08:19

... to the communication distance between the transmitter and the receiver, we can classify the wireless network standards into Wide Area Network (WAN), Wireless Local Area Network (WLAN) and Wireless ... AWGN channel Figure 2.6 Bluetooth BER under fading channels Figure 2.7 Bluetooth BER under interference and AWGN channel Figure 2.8 Bluetooth BER performance under interference and fading channels ... DBPSK, DQPSK and CCK employed in Bluetooth and IEEE 802.11b systems are introduced Then the performance of these modulations in the two systems is evaluated under AWGN, fading channel and interference...

Ngày tải lên: 12/09/2015, 10:21

... Switzerland a e-mail: marc-alexandre.dubois@csem.ch; claude.muller@csem.ch C.C Enz and A Kaiser (eds.), MEMS-based Circuits and Systems for Wireless Communication, Integrated Circuits and Systems, ... 333, USA e-mail: piazza@ece.cmu.edu C.C Enz and A Kaiser (eds.), MEMS-based Circuits and Systems for Wireless Communication, Integrated Circuits and Systems, DOI 10.1007/978-1-4419-8798-3 2, © ... 207 St´ phane Razafimandimby, Cyrille Tilhac, Andreia Cathelin, e and Andreas Kaiser vii viii Contents Part III MEMS-Based Systems A MEMS-Enabled Two-Receiver Chipset for...

Ngày tải lên: 30/03/2014, 07:20

... SISO and real × MIMO systems For the MIMO case, the antenna spacing was and cm (half- and one wavelength at GHz), and two array orientations (TX-x/RX-x (endfire) EURASIP Journal on Wireless Communications ... motion along the y-axis and AS = 1.0 λ Figure 13: Channel autocorrelation and Doppler spectrum for fD = 31 Hz of 2×2 MIMO channels EURASIP Journal on Wireless Communications and Networking x1 s1 ... measured channel data, we examine received power in Section and channel autocorrelation and Doppler spectrum in Section for both SISO and MIMO cases To investigate the performance of MIMO E-SDM systems...

Ngày tải lên: 21/06/2014, 18:20

... E2213-03: Standard Specification for Telecommunications and Information Exchange Between Roadside and Vehicle Systems- 5 GHz Band Dedicated Short Range Communications Medium Access Control and Physical ... frequency selectivity of the wireless multipath fading channel [3, 4] In wireless fading channel, since the envelope and phase of signal vary in time and frequency domain, channel estimation process ... 0.74) scheme and frequency offset estimation scheme for existing OFDM-based wireless packet communication system such as IEEE802.11a and future generation OFDM-based wireless packet communication...

Ngày tải lên: 21/06/2014, 23:20

... 32 [83], symbol scrambling codes, and so on 2.2.3 Channel estimation for OFDM systems For wide-band wireless communication systems, the channel is time varying and dispersive fading, which will ... for Rayleigh fading channel and Ricean fading channel, by computer simulation and numerical method 166 x Chapter 1: Introduction The research on wireless communication systems with high data ... thesis studies channel estimation for OFDM systems over time varying and frequency dispersive fading channels With the increasing number of mobile phone users and higher demands for wireless services,...

Ngày tải lên: 20/11/2012, 11:28

Ngày tải lên: 08/04/2014, 10:02

... Generation Wireless Systems and Networks Hsiao-Hwa Chen and Mohsen Guizani  2006 John Wiley & Sons, Ltd 20 FUNDAMENTALS OF WIRELESS COMMUNICATIONS and modern wireless networks and communications ... frequency dispersive channel 30 FUNDAMENTALS OF WIRELESS COMMUNICATIONS 2.1.4 Wideband and Time-Domain Characteristics After the discussion on narrowband characteristics of a wireless channel, as given ... on (a) wireless networking, (b) wireless communication systems, (c) 3G mobile cellular communications, (d) B3G wireless communications, and (e) emerging wireless communication technologies INTRODUCTION...

Ngày tải lên: 03/06/2014, 01:05

... Personal Access Communications Systems (PACS), and Personal Handyphone System (PHS) [25, 32] CT2 and DECT primarily are used as wireless extensions of residential or office telephones PACS and PHS, on ... Scientific, and Medical (ISM) radio frequency bands In the United States, the ISM bands include the 900-MHz band (902 –928 MHz), 2.4-GHz band (2400 – 2483.5 MHz), and the 5.7-GHz band (5725 – ... signaling and session control needed to support real-time and multimedia applications in IP networks and in the IP Multimedia Subsystems (IMS) defined by 3GPP and 3GPP2 Chapters 4, 5, and discuss...

Ngày tải lên: 03/06/2014, 01:45

... of interchannel interference in digital communication systems, in Proceedings of IEEE Radio and Wireless Symposium, pp 118–121 (Phoenix, AZ, 2011) [5] M Abramowitz, IA Stegun (eds.), Handbook ... protocols that coexist in many 3G smartphones and mobile hotspots, is presented in “Impulsive interference in communication channels and its mitigation by SPART and other nonlinear filters” by AV Nikitin, ... (separately for the in-phase and the quadrature traces I/Q) and frequency domains The incoming signal represents a communication signal with the total bandwidth of MHz, affected by a bandlimited mixture...

Ngày tải lên: 18/06/2014, 22:20

... of interchannel interference in digital communication systems, in Proceedings of IEEE Radio and Wireless Symposium, pp 118–121 (Phoenix, AZ, 2011) [5] M Abramowitz, IA Stegun (eds.), Handbook ... protocols that coexist in many 3G smartphones and mobile hotspots, is presented in “Impulsive interference in communication channels and its mitigation by SPART and other nonlinear filters” by AV Nikitin, ... (separately for the in-phase and the quadrature traces I/Q) and frequency domains The incoming signal represents a communication signal with the total bandwidth of MHz, affected by a bandlimited mixture...

Ngày tải lên: 20/06/2014, 04:20

... et al.: An occupancy-based and channelaware multi-level adaptive scheme for video communications over wireless channels EURASIP Journal on Wireless Communications and Networking 2011 2011:199 ... difficulties in wireless channels Scalable video coding was integrated with adaptive modulation and channel coding A per-frame rate control technique was implemented based on the channel condition and the ... correctable bits and Sp is the packet size including the FEC bits Let C be the error-free channel bitrate for binary phase shift keying and let Ci be the effective channel bit rate when the channel is...

Ngày tải lên: 20/06/2014, 21:20

... nature of interchannel interference in digital communication systems, in Proceedings of IEEE Radio and Wireless Symposium, Phoenix, AZ, pp 118–121 (2011) Abramowitz M, Stegun IA (eds.), Handbook of ... (separately for the in-phase and the quadrature traces I/Q) and frequency domains The incoming signal represents a communication signal with the total bandwidth of MHz, affected by a bandlimited mixture ... the channel bandwidth The incoming signal is filtered by (i) an RC integrator with the time constant τ = 16 ns (black lines in the lefthand panels) and (ii) a DoL circuit with the same τ and...

Ngày tải lên: 20/06/2014, 21:20