Multi carrier and spread spectrum systems phần 2 docx

... −3 0 2. 5 0 0 2 0.1 −4 0 .2 0 0.3 0 0.1 −1.5 3 0 .2 −8 0.5 2 1.0 −3 0.3 −4.5 4 0.3 − 12 1.6 −6 1.6 −5 0.5 −7.5 5 0.4 −16 2. 3 −8 5.0 2 15.0 −8.0 6 0.5 20 5.0 −10 6.6 −4 17 .2 −17.7 Multi- Carrier ... 1-8(b). Spread Spectrum Techniques 31 Table 1 -2 Broadcasting standards DAB and DVB-T Parameter DAB DVB-T Bandwidth 1.5 MHz 8MHz Number of sub-carriers N c 1 92 (25 6 FFT) 38...

Ngày tải lên: 09/08/2014, 19:22

... 16.3 dB 1 /2 8.8 dB 9.6 dB 11 .2 dB 2/ 3 11.1 dB 11.6 dB 14 .2 dB 16-QAM 3/4 12. 5 dB 13.0 dB 16.7 dB 5/6 13.5 dB 14.4 dB 19.3 dB 7/8 13.9 dB 15.0 dB 22 .8 dB 1 /2 14.4 dB 14.7 dB 16.0 dB 2/ 3 16.5 dB ... in multi- carrier systems is shown. To evaluate and optimize the channel estimation, a multi- carrier reference scenario typical for mobile radio systems is defined. The fr...

Ngày tải lên: 09/08/2014, 19:22

... T s T G = 1/ 32 T s α = 0 .25 1 /2 0.66 0.69 0.83 QPSK 3/4 0.99 1.03 1 .25 1 /2 1. 32 1.37 1.67 Channel spacing 1 16-QAM 3/4 1.98 2. 06 2. 50 1 /2 1.98 2. 06 2. 50 64-QAM 3/4 2. 97 3.09 3.75 1 /2 2.63 2. 75 3.33 QPSK 3/4 ... symbols Sub -carrier spacing 1 Sub -carrier spacing 2 Sub -carrier spacing 3 Rectangular 187 0 .20 944 s 0.104 72 s 0.0 523 6 s Nyquist w/o FH 195 0 ....

Ngày tải lên: 09/08/2014, 19:22

... and Practical Guide. Indianapolis: SAMS, 20 02. [27 ] IEEE 8 02. 16ab-01/01, “Air interface for fixed broadband wireless access systems – Part A: Systems between 2 and 11 GHz,” IEEE 8 02. 16, June 20 00. [28 ] ... −1)  1 L L−1  l=0 |G l,l H l,l | 2 −     1 L L−1  l=0 G l,l H l,l     2  + σ 2 2 L−1  l=0 |G l,l | 2 w (k) . (2. 81) When MMSE equalization is use...

Ngày tải lên: 09/08/2014, 19:22

... (ISSSTA 20 02) , Prague, Czech Republic, pp. 118– 122 , Sept. 20 02. [39] Popovic B.M., “Spreading sequences for multicarrier CDMA systems, ” IEEE Transactions on Communi- cations, vol. 47, pp. 918– 926 , ... sub-bands to avoid adjacent Multi- Carrier and Spread Spectrum Systems K. Fazel and S. Kaiser  20 03 John Wiley & Sons, Ltd ISBN: 0-470-84899-5 MC-CDMA 77 024 6...

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... 679–691, April 20 00. Multi- Carrier Modulation and Demodulation 121 Total channel bandwidth Guard band DC sub -carrier (not used) Unused sub-carriers i.e.Virtual sub-carriers Guard band Unused sub-carriers i.e.Virtual ... sin(π l) r(2l +1) = I(2l + 1) cos(π(2l + 1) /2) + Q(2l +1) sin(π(2l +1) /2) (4.14) It is straightforward to show that the desired output I and Q components are re...

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... 178 Implementation Issues 20 21 22 10 −5 10 −4 10 −3 10 2 10 −1 10 0 23 BER 24 E b /N 0 in dB 25 26 27 phase noise without correction phase noise with correction without ... E b /N 0 at BER = 10 −9 (23 ,17)(31 ,25 ) 53 bytes 0.596 4.5 dB (16,15)(64,57) 106 bytes 0.834 6 .2 dB (56,49)( 32, 26) 159 bytes 0.711 3.8 dB (49, 42) ( 32, 31) 159 bytes 0. 827 6.5 dB (43, 42) ( 32, 31)...

Ngày tải lên: 09/08/2014, 19:22

... symbol BPSK 1 /2 1 48 24 BPSK 3/4 1 48 36 QPSK 1 /2 2 96 48 QPSK 3/4 2 96 72 16-QAM 1 /2 4 1 92 96 16-QAM 3/4 4 1 92 144 64-QAM 2/ 3 6 28 8 1 92 64-QAM 3/4 6 28 8 21 6 Tabl e 5-6 Data rates of IEEE 8 02. 11a PHY ... T s (µs) T g (µs) 1.75 128 4 8 16 32 3.5 64 2 4 8 16 7 32 1 2 4 8 14 16 1 /2 1 2 4 28 8 1/4 1 /2 1 2 Cellular Mobile Communications Beyond 3G 199 5 .2....

Ngày tải lên: 09/08/2014, 19:22

... characteristics 20 6 FEC coding and modulation 20 8 20 9 Link budget 20 9 21 0 MAC frame structure 20 6 20 7 IEEE 8 02. 11b 4 IEEE 8 02. 16a 32, 197, 21 0 22 0 FEC coding and modulation 21 6 22 0 Link budget 22 1 MAC ... model 20 HIPERLAN /2 4, 7, 31, 197, 20 5 20 9 Channel model/characteristics 21 , 20 6 FEC coding and modulation 20 8 20 9 Link budget 20 9 21 0 MAC frame...

Ngày tải lên: 09/08/2014, 19:22