Theory and applications of ofdm and cdma wideband wireless communications phần 9 pot

... 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

... = 80 OFDM with 16- QAM and R c = 0.5 Figure 4.74 Simulation of narrowband OFDM for a slow and flat channel. 240 OFDM The complex QAM symbols will be processed blockwise by an IFFT device of FFT ... 1536, 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 c...

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... 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 ... Figure 5.17. CDMA 299 2 3 4 5 6 7 8 9 10 0 0.5 1 1.5 2 2.5 H SHO [dB] B = 40 dB B = 30 dB Fraction of connections in SHO mode Mean number of BSs per connections Figure 5.23 S...

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... (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. ... examples of CDMA applications we discuss the most important systems already mentioned, namely, GPS, cdmaOne (IS -95 ), cdma2 000 and UMTS with its two tran...

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... fluctuations of the received time signal for ν max = 50 Hz, corresponding for example, to a transmit signal at 90 0 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 BA...

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... 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 ... probability 0 .99 9 (approximately), and an LLR value of −30 dB means that the random bit equals one with a probability 0 .99 9 (approximately). Using Equation (3.8), the prob...

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... in great parts by Hagenauer and coworkers (Hagenauer 198 8, 199 5; Hagenauer and Hoeher 198 9; Hagenauer et al. 199 6). It is interesting to note that the concept of soft-output decoding introduced ... 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 and Christia...

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... 0.2 0.001 0.003 0.01 0.02 0.05 0.10 0.25 0.50 0.75 0 .90 0 .95 0 .98 0 .99 0 .99 7 0 .99 9 0.001 0.003 0.01 0.02 0.05 0.10 0.25 0.50 0.75 0 .90 0 .95 0 .98 0 .99 0 .99 7 0 .99 9 0.001 0.003 0.01 0.02 0.05 0.10 0.25 0.50 0.75 0 .90 0 .95 0 .98 0 .99 0 .99 7 0 .99 9 Interferer ... 0.2 0.001 0.003 0.01 0.02 0.05 0.10 0.25 0.50 0.75 0 .90 0 .95 0 .98 0 .99 0 .99 7 0 .99 9 0.001 0....

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... pa- rameters for OFDM, modulation and channel coding. The corresponding IEEE 802.11a standard (IEEE 802.11a 199 9) and HIPERLAN/2 standard (EN101475 2001) were released in 199 9 and 2000, respectively. The ... very serious candidate and, at the end of the project, an OFDM system was standardized in 199 3 (see (EN300401 2001a) for a recent update of the standard). An exhaustive t...

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... 113 Slotted mode, 299 , 375 Smart antennas, 301, 3 69 Smoothing window, 165 SNR, 39, 40, 1 59 Soft capacity planning, 293 Soft handover, 270, 295 , 374, 3 79, 386 Softer handover, 296 SOVA, 124 Spectrum ... derived. 406 INDEX Nyquist base, 9 criterion, 10 pulse, 9 OFDM, 1, 145 OFDM and nonlinearities, 166 symbol, 1 59 OFDM with convolutional coding, 208, 213 OFDM with QAM, 2...

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