B. P. Lathi, Zhi Ding - Modern Digital and Analog Communication Systems-Oxford University Press (2009)

664 SPREAD SPECTRUM COMMUNICATIONS
4. http://www.bluetooth.com.
5. http://www.physics.princeton.edu(trothman/Broertjes_patent.pdf.
6. David Wa1lace, "Hedy Lamarr," Lost Magazine, October 2006.
7. J. S. Lehnert, "An Efficient Technique for Evaluating Direct-Sequence Spread-Spectrum Communications,"
IEEE Trans. on Commun., vol. 37, pp. 851-858, August 1989.
8. R. Lupas and S. Verdu, "Near-Far Resistance of Multiuser Detectors in Asynchronous Channels,"
IEEE Trans. Commun., vol. COM-38, no. 4, pp. 496-508, April 1990.
9. S. Verdu, Multiuser Detection. Cambridge University Press, New York. 1998.
10. S. Verd(1, "Optimum Multiuser Asymptotic Efficiency," IEEE Trans. Commun., vol. COM-34, no.
9, pp. 890-897, Sept. 1986.
11. R. Lu pas and S. Verdu, "Linear Multiuser Detectors for Synchronous Code-Division Multiple-Access
Channel," IEEE Trans. Inform. Theory, vol. 35, pp. 123-136, Jan. 1989.
12. Z. Xie, R. T. Short, and C. K. Rushforth, "A Family of Suboptimum Detectors for Coherent Multiuser
Communications," IEEE Journal on Selected Areas of Communications, vol. 8, pp. 683-690,
May 1990.
13. M. K. Varanasi and B. Aazhang. "Near-Optimum Detection in Synchronous Code-Division Multiple­
Access Systems," IEEE Trans. Commun., vol. 39, pp. 825-836. May 1991.
14. A. J. Viterbi, "Very Low Rate Convolutional Codes for Maximum Theoretical Performance of Spread­
Spectrum Multiple-Access Channels," IEEE J. Select. Areas Commun., vol. 8, no 4, May 1990,
pp. 641-649.
15. R. Kohno, H. Imai, M. Hatori, and S. Pasupathy, "Combination of an Adaptive Array Antenna and
a Canceler of Interference for Direct-Sequence Spread-Spectrum Multiple-Access System,"
IEEE J. Select. Areas Commun., vol. 8, no. 4. May 1990, pp. 675-682.
16. Juha Korhonen, Introduction to 3G Mobile Communications, Artech House, Boston, 2001.
17. S. C. Yang, 3G CDMA2000 Wireless System Engineering, Artech House, Boston, 2004.
18. Keiji Tachikawa, ed. W- CDMA Mobile Communications System, Wiley, 2002.
19. 3rd Generation Partnership Project 2, "Physical Layer Standard for cdma2000 Spread Spectrum
Systems," 3GGP2 C. S0002-D, Version 1.0, Feb. 13, 2004.
PROBLEMS
11.1-1 Considera fast hopping binary ASK system. The AWGN spectrum equals Sn (f) = 10-6 and the
binary signal amplitudes are O and 2 V, respectively. The ASK uses a data rate of 100 kbit/s and
is detected noncoherently. The ASK requires 100 kHz bandwidth for transmission. However, the
frequency hopping is over 12 equal ASK bands with bandwidth totaling 1.2 MHz. The partial
band jammer can generate a strong Gaussian noise-like interference with total power of 27 dBm.
(a) If a partial band jammer randomly jams one of the 12 FH channels, derive the BER of the
FH-ASK if the ASK signal hops 6 bands per bit period.
(b) If a partial band jammer randomly jams two of the 12 FH channels, derive the BER of the
FH-ASK if the ASK signal hops 6 bands per bit period.
(c) If a partial band jammer jams all 12 FH channels, derive the BER of the FH-ASK if the
ASK signal hops 6 bands per bit period.
11.1-2 Repeat Prob. 11.1-1 if the ASK signal hops 12 bands per bit period.
11.1-3 Repeat Prob. 11.1-1 if the ASK signal hops one band per bit period.
11.2-1 In a multiuser FHSS system that applies BFSK for each user transmission, consider each interfering
user as a partial band jammer. There are M users and L total signal bands for synchronous
frequency hopping. The desired user under consideration hops Lh bands within each bit period.