spread spectrum communications handbook

... của nó; Có thể dùng cho thông tin vệ tinh trong CDMA. Trải phổ nhảy tần Frequency Hopping Spread Spectrum  Frequency Hopping Spread Spectrum (FHSS)  Được phát minh bởi nữ diễn viên Hollywood ... Mhz phổ thành 79 kênh , mỗi kênh 1Mhz công tác tại tần số 900Mhz, tốc độ nhảy tần khoảng 2,5 hops/s (US) Ví dụ Công nghệ trải phổ  Công nghệ trải phổ cho phép truyề...

Ngày tải lên: 13/09/2012, 11:16

... Milliseconds (ms) 200 40 0 600 800 1000 1200 140 0 1600 2 .40 1 2 .47 9 Transmission Frequency (GHz) Divided into 79 1 MHz Channels Frequency Hopping Spread Spectrum An Example of a Co-located Frequency ... 52 sub-channels with each sub-channel 300 KHz each. ☛ 48 Sub-channels are used to transmit data ☛ 4 sub-channels are used as Pilot carriers to monitor the channel 8 Channels 5...

Ngày tải lên: 13/09/2012, 11:16

... multi-carrier spread spectrum systems. We hope that this book will contribute to a better understanding of the principles of multi-carrier and spread spectrum and may motivate further investigation into and development ... Multi-Carrier and Spread Spectrum Systems xiv Preface and DLR on the design of a future broadband air interface or the EU-IST MATRICE, 4MORE...

Ngày tải lên: 02/03/2013, 16:58

Ngày tải lên: 29/09/2013, 20:20

... requiring spread spectrum modulation: DSSS (Direct Sequence Spread Spectrum) and FHSS (Frequency Hopping Spread Spectrum) . Only the RF transmission has significant presence in the market. 1Mbps Spreading d t pn t DBPSK 11 ... Sint-Katelijne-Waver Belgium www.denayer.be Spread Spectrum (SS) applications ir. J. Meel jme@denayer.wenk.be Studiedag Spread Spectrum 6 okt. ’99...

Ngày tải lên: 13/12/2013, 00:15

... as In terms of this distribution, (1-110) becomes PRINCIPLES OF SPREAD-SPECTRUM COMMUNICATION SYSTEMS 32 CHAPTER 1. CHANNEL CODES For coherent PSK signals over an AWGN channel and soft decisions, ... exploiting the potential capabilities of spread- spectrum communication systems. Although direct-sequence systems greatly suppress interference, practical systems require ch...

Ngày tải lên: 20/01/2014, 06:20

Ngày tải lên: 19/02/2014, 14:20

... Co-existence. A spread- spectrum system is less susceptible to interfer- ence than other non -spread- spectrum systems. In addition, with proper de- signing of pseudo-random sequences, multiple spread- spectrum ... signal differently from other forms of digital radio. In spread- spectrum operation, the radio signal is spread across a great bandwidth with the use of a spread-...

Ngày tải lên: 08/06/2014, 20:17

... pair Fourier Fourier, the spread spectrum technique allows to reduce the number of measurements for perfect recovery close to this optimal value. 16 Universal and efficient compressed sensing by spread ... Application to realistic Fourier imaging In this section, we discuss the application of the spread spectrum technique to realistic analog Fourier...

Ngày tải lên: 20/06/2014, 20:20

... the conventional schemes. 7. Conclusion In this paper, we proposed a collusion-resistant finger- printing scheme based on the CDMA technique. In the proposed scheme, each user’s fingerprint consists ... feature contributes on the reduction of the false positive probability as well as the computational complexity at the detection. 6. Simulation Results For the evaluat...

Ngày tải lên: 21/06/2014, 05:20

... Application to realistic Fourier imaging In this section, we discuss the application of the spread spectrum technique to realistic analog Fourier imaging such as radio interferometric imaging or ... [31]. In general, spread spectrum techniques are used for their robustness to narrowband interference and also to establish secure communications. 2 Compressed...

Ngày tải lên: 21/06/2014, 17:20

... appeared upon acceptance. Fully formatted PDF and full text (HTML) versions will be made available soon. Sparse correlation matching-based spectrum sensing for open spectrum communications EURASIP ... reproduction in any medium, provided the original work is properly cited. Sparse correlation matching-based spectrum sensing for open spectrum communications Eva...

Ngày tải lên: 21/06/2014, 17:20

... rate −10 −8 −6 −4 −20246810 SNR (dB) No interference No excision (single interference) No excision (multiple interference) Single interference excised Multiple interference excised Figure 7: Chip ... used since the sys- tem can suppress the interference partly without interference excision prior to despreading. In systems proposed by other researchers [8], the excision...

Ngày tải lên: 22/06/2014, 19:20

... Processing Volume 2007, Article ID 20542, 13 pages doi:10.1155/2007/20542 Research Article Resource Allocation with Adaptive Spread Spectrum OFDM Using 2D Spreading for Power Line Communications Jean-Yves ... principles to an spread spectrum OFDM (SS -OFDM) waveform which i s a multicarrier system using 2D spreading in the time and frequency domains...

Ngày tải lên: 22/06/2014, 19:20

... Part 1 INTRODUCTION TO SPREAD- SPECTRUM COMMUNICATION Source: SPREAD SPECTRUM COMMUNICATIONS HANDBOOK Downloaded from Digital Engineering Library @ McGraw-Hill ... to the Terms of Use as given at the website. Chapter 1 A SPREAD- SPECTRUM OVERVIEW Over thirty years have passed since the terms spread- spectrum (SS) and noise modulation and correlation (NOMAC) ... of dimension a...

Ngày tải lên: 26/10/2014, 14:31