Multi carrier and spread spectrum systems phần 3 ppsx

... generation for one user Multi- Carrier Spread Spectrum 43 data symbols spread data symbols spreading code serial- to- parallel converter 01 • L − 1 sub -carrier f 0 sub -carrier f 1 sub -carrier f N c −1 01 • L ... vol. 30 , pp. 9 13 924, May 1982. [31 ] Kondo S. and Milstein L.B., “On the use of multicarrier direct sequence spread spectrum systems, ” in Proc. IEEE Milit...

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... constellation and FEC scheme but also on the amount of reference and pilot symbols spent to guarantee reliable synchronization and channel estimation. Multi- Carrier and Spread Spectrum Systems K. Fazel and ... 679–691, April 2000. Multi- Carrier Modulation and Demodulation 121 Total channel bandwidth Guard band DC sub -carrier (not used) Unused sub-carriers i.e.Virtu...

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... 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 ) 159 bytes 0.945 ... performance of multi- carrier and multi- carrier CDMA transmission with a high number of sub-carriers in the presence of low cost oscillators with phase noise...

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... Proceedings of the 3rd International Workshop on Multi- Carrier Spread- Spectrum & Related Topics (MC-SS’01). [22] Fazel K. and Kaiser S. (eds), Special Issue on Multi- Carrier Spread Spectrum and Related ... combination of DS-CDMA and multi- carrier modulation was proposed in 19 93 [6][11][19][21] [31 ][45][50]. Two different realizations of multiple access exploit...

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... 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 8 101214 16 18 20 E b /N 0 in dB 10 −5 10 −4 10 3 10 −2 10 −1 10 0 BER MRC EGC ZF MMSE MC-CDMA ... T s = N c T d L .(2. 93) With multi- carrier direct sequence spread spectrum, each data symbol is spread over L multi- ca...

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... 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 17.1 dB 19 .3 dB 64-QAM 3/ 4 18.0 dB 18.6 dB 21.7 dB 5/6 19 .3 dB 20.0 dB 25 .3 dB 7/8 ... 3. 1 dB 3. 6 dB 5.4 dB 2 /3 4.9 dB 5.7 dB 8.4 dB QPSK 3/ 4 5.9 dB 6.8 dB 10.7 dB 5/6 6.9 dB 8.0 dB 13. 1 dB 7/8 7.7 dB 8.7 dB 16 .3 dB 1/2 8.8 dB 9.6 dB 11.2 dB 2 /3 11.1 d...

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... current and future standards (4G) is plotted. The current 2G GSM system provides high mobility but a low data rate. 3G systems provide similar mobility as Multi- Carrier and Spread Spectrum Systems ... pp. 32 8 35 3, March 1980. [ 83] Wang X. and Liu K.J.R., “Adaptive channel estimation using cyclic prefix in multi- carrier modulation system,” IEEE Communications Letters,...

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... 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 ... required symmetrical or asymmetrical transmission capacity, and whether they Multi- Carrier and Spread Spectrum Systems K. Fazel and S. Kaiser ...

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... Multi- Carrier MC-CDMA Multi- Carrier CDMA MC-DS-CDMA Multi- Carrier DS-CDMA MCM Multi- Carrier Modulation MC-SS Multi- Carrier Spread Spectrum MC-TDMA Multi- Carrier TDMA (OFDM and TDMA) MD Multiuser Detection MF ... 33 34 Frequency hopping OFDMA 99 Frequency synchronization 136 – 139 Coarse frequency synchronization 136 – 138 CAZAC/M sequence 137 Schmidl and...

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