Theory and applications of ofdm and cdma wideband wireless communications phần 3 ppt

... 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 T...

Ngày tải lên: 09/08/2014, 19:22

... fluctuations of the received time signal for ν max = 50 Hz, corresponding for example, to a transmit signal at 900 MHz for a vehicle Theory and Applications of OFDM and CDMA Henrik Schulze and Christian ... function of the signal-to-noise ratio. The bit error probabilities of Equations (1.95) are depicted in Figure 1.18. For high values of E b /N 0 , 16-QAM shows BASICS...

Ngày tải lên: 09/08/2014, 19:22

... 0, 1, 2, 3, 4, 5, 6 is defined by the addition table + 1 234 56 1 234 560 2 34 5601 3 456012 4 5601 23 5 601 234 6 01 234 5 and the multiplication table 1 234 56 246 135 36 2514 4152 63 531 642 65 432 1 Note ... 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 Schulze...

Ngày tải lên: 09/08/2014, 19:22

... (1.17) Theory and Applications of OFDM and CDMA Wideband Wireless Communications Henrik Schulze and Christian L ¨ uders Both of Fachhochschule S¨udwestfalen Meschede, Germany x PREFACE and modulation. ... 131 3. 3.2 Galoisfieldarithmetics 133 3. 3 .3 Construction of Reed–Solomon codes . . . . . . . . . . . . . . . . 135 3. 3.4 Decoding of Reed–Solomon codes ....

Ngày tải lên: 09/08/2014, 19:22

... curves of the channel coding and modulation scheme. −5 −4 3 −2 −1 0 1 2 3 4 5 −4 3 −2 −1 0 1 2 3 4 I Q Figure 4 .33 16-QAM for OFDM with frequency offset given by δ = δf · T = 0.01. OFDM 195 However, ... spectra of an OFDM for K = 48, 96, 38 4, 1 536 . the side lobes of the complete OFDM spectrum show a steeper decay and the spec- trum comes closer to a rectangular s...

Ngày tải lên: 09/08/2014, 19:22

... 2 K = 1 536 , 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 carrie...

Ngày tải lên: 09/08/2014, 19:22

... very serious candidate and, at the end of the project, an OFDM system was standardized in 19 93 (see (EN300401 2001a) for a recent update of the standard). An exhaustive treatment of the DAB system ... pseudonoise (PN) sequences or code signals. We Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L ¨ uders  2005 John Wiley & Sons, Ltd 266 C...

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 s...

Ngày tải lên: 09/08/2014, 19:22

... 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 the Wideband CDMA (WCDMA), ... While the WCDMA and TD -CDMA- based modes use a chip rate of 3. 84 Mchip/s and a carrier separation of about 5 MHz, the chip rate for the TD-SCDMA mode is 1.28 Mchip...

Ngày tải lên: 09/08/2014, 19:22

... 35 6 Capacity, 290, 295 CDMA, 1,265 cdma2 000, 38 6 cdmaOne, 38 0 Cell search, 37 1, 37 8, 38 4, 39 1 Channel coding, 93, 245 Theory and Applications of OFDM and CDMA Henrik Schulze and Christian L ¨ uders  ... (SUMF) receiver, 31 5, 31 6 SISO decoder, 1 13 Slotted mode, 299, 37 5 Smart antennas, 30 1, 36 9 Smoothing window, 165 SNR, 39 , 40, 159 Soft capacity...

Ngày tải lên: 09/08/2014, 19:22