Theory and applications of ofdm and cdma wideband wireless communications phần 7 ppsx

... Polytechnic Institute and State University Blacksburg, Virginia Multi-Carrier Digital Communications: Theory and Applications of OFDM Ahmad R. S. Bahai and Burton R. Saltzberg Principles of Digital Transmission: ... requirement of an equalizer in a typical single carrier implementation for wireline applications. Multi-Carrier Digital Communications Theory...

Ngày tải lên: 02/03/2013, 16:58

... catering (including vending machines) and the food and drink children bring into school, the taught curriculum (including PE), school travel plans and provision for cycling, and policies relating ... Section 3 on pages 59 and 60 has links to tools to help with implementing the recommendations, meeting training needs, evaluating the impact of action and working...

Ngày tải lên: 21/02/2014, 11:20

... evidence of effectiveness, including cost effectiveness. They include recommendations on the clinical management of overweight and obesity in the NHS, and advice on the prevention of overweight and ... overweight and obesity in adults and children in England and Wales. The guidance aims to: ã stem the rising prevalence of obesity...

Ngày tải lên: 22/03/2014, 09:20

... symbols to OFDM symbols such that The linear mapping can be represented in matrix form as: 17 Multi-Carrier Digital Communications Theory and Applications of OFDM Ahmad R. S. Bahai and Burton ... TECHNIQUES FOR WIRELESS LAN OFDM FOR W IRELESS LAN RECEIVER STRUCTURE 175 181 182 187 Multi-Carrier Digital Communications Theory and Applications of...

Ngày tải lên: 27/06/2014, 15:20

... BibliographicalNotes 14 2 3.5 Problems 14 3 4 OFDM 14 5 4 .1 GeneralPrinciples 14 5 4 .1. 1 Theconceptofmulticarriertransmission 14 5 4 .1. 2 OFDMasmulticarriertransmission 14 9 4 .1. 3 ImplementationbyFFT 15 3 4 .1. 4 OFDMwithguardinterval ... by the signal s(t) = K  k =1 s k g k (t). (1. 17) Theory and Applications of OFDM and CDMA Wideband Wireless Communica...

Ngày tải lên: 09/08/2014, 19:22

... gain | c(t) | 2 of the channel can be calculated as | c(t) | 2 = a 2 1 + a 2 2 + 2a 1 a 2 cos ( 2 ( ν 1 − ν 2 ) t +θ 1 − θ 2 ) . Figure 2. 4 shows | c(t) | 2 for a 1 = 0.75 and a 2 = √ 7/4. The ... gain | H(f) | 2 of the channel can be calculated as | H(f) | 2 = a 2 1 + a 2 2 + 2a 1 a 2 cos ( 2 f ( τ 1 − τ 2 ) + θ 2 − θ 1 ) . The picture is similar to...

Ngày tải lên: 09/08/2014, 19:22

... is often convenient to work with code words of finite length, but it is not necessary, and the length is not determined by the code. Theory and Applications of OFDM and CDMA Henrik Schulze and ... modulo 2 addition of more than two random bits and write L ≈ K  i=1 sign ( L i ) · min ( | L 1 | , , | L K | ) . (3. 14) 3 Channel Coding 3. 1 General Principles 3. 1.1...

Ngày tải lên: 09/08/2014, 19:22

... 0, 1, 2, 3, 4, 5, 6 is defined by the addition table + 12 345 6 1 2 345 60 2 345 601 3 45 6012 4 560123 5 6012 34 6 012 345 and the multiplication table 12 345 6 246 135 3625 14 415263 531 642 6 543 21 Note that ... duration that is matched to the channel and parallelize the given data stream in an appropriate way. Theory and Applications of OFDM and CDMA Henrik Schul...

Ngày tải lên: 09/08/2014, 19:22

... 162 OFDM 0 50 100 150 200 250 300 350 400 450 50 0 50 –40 –30 –20 (a) ( b ) –10 0 10 Normalized frequency fT Power spectrum (linear) 0 50 100 150 200 250 300 350 400 450 50 0 50 –40 –30 –20 –10 0 10 Normalized ... (b) and the amplitude (c) of an OFDM signal of average power one. –3 –2 .5 –2 –1 .5 –1 –0 .5 0 0 .5 1 1 .5 2 0.001 0.003 0.01 0.02 0. 05 0.10 0. 25 0 .50 0...

Ngày tải lên: 09/08/2014, 19:22

... 2 K = 15 36, L = 80 OFDM with 16- QAM and R c = 0.5 CE ideal CE real Figure 4 .67 Simulation of a wideband OFDM system with 16- QAM for a moderately fast and frequency nonselective channel. OFDM 241 0 ... function of E b /N 0 for such a channel and 16- QAM transmission with code rate R c = 1/2 and a huge time and frequency interleaving over the bandwidth of K = 768 ca...

Ngày tải lên: 09/08/2014, 19:22

... multiplication of the data symbols by a spreading sequence of pseudoran- dom signs. These sequences are called pseudonoise (PN) sequences or code signals. We Theory and Applications of OFDM and CDMA Henrik ... definition of wideband is the same as that introduced in Chapter 4 for OFDM. Furthermore, it should not be confused with one transmission mode of UMTS, which is...

Ngày tải lên: 09/08/2014, 19:22

... number of base stations involved in a soft handover should be kept small. To illustrate this soft handover effort, Figure 5.23 shows the fraction of connections involved in a soft (or softer) handover ... difference of the local mean levels of both signals has been set to 0, 3and6 dB. In Figure 5.22, the corresponding probability functions of the signal levels with and without sof...

Ngày tải lên: 09/08/2014, 19:22

... Subsection 4.6.3 – use OFDM to handle data rates of up to 54 Mbit/s. More details on the IEEE 802.11 standard can be found, for example, in (O’Hara and Petrick 199 9). 350 CDMA Since v l = h † l r ... using pure CDMA and a time division duplex (TDD) mode using a combination of CDMA and TDMA as the multiple access scheme. The FDD mode is based on a proposal originally called...

Ngày tải lên: 09/08/2014, 19:22

... INDEX Nyquist base, 9 criterion, 10 pulse, 9 OFDM, 1, 145 OFDM and nonlinearities, 166 symbol, 159 OFDM with convolutional coding, 208, 213 OFDM with QAM, 213 OFDM with QPSK, 208 Omni cell, 270 Open-loop ... 384, 391 Channel coding, 93, 245 Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L ă uders 2005 John Wiley & Sons, Ltd Channel codi...

Ngày tải lên: 09/08/2014, 19:22

... is the reality of teaching and learning speaking skill in Viet Bac high school? What are the attitudes of students and teachers towards pair and group work in a speaking lesson there? Whether ... the attitudes of teachers and 11 th grade students at Viet Bac high school towards the application of pair and groupwork in teachin...

Ngày tải lên: 28/03/2015, 09:41