Abstract
Multiple access is the ability of many users to communicate with each other while sharing a common transmission medium. Wireless multiple-access communications are facilitated if the transmitted signals are orthogonal or separable in some sense. Signals may be separated in time (time-division multiple access or TDMA), frequency (frequency-division multiple access or FDMA), or code (code-division multiple access or CDMA). This chapter presents the general characteristics of direct-sequence CDMA (DS-CDMA) and frequency-hopping CDMA (FH-CDMA) systems. The use of spread-spectrum modulation with CDMA allows the simultaneous transmission of signals from multiple users in the same frequency band. All signals use the entire allocated spectrum, but the spreading sequences or frequency-hopping patterns differ. Information theory indicates that in an isolated cell, CDMA systems achieve the same spectral efficiency as TDMA or FDMA systems only if optimal multiuser detection is used. However, even with single-user detection, CDMA has advantages for mobile communication networks because it eliminates the need for frequency and time-slot coordination, allows carrier-frequency reuse in adjacent cells, imposes no sharp upper bound on the number of users, and provides resistance to interference and interception. In this chapter, the vast potential and practical difficulties of spread-spectrum multiuser detectors, such as optimal, decorrelating, minimum mean-square error, or adaptive detectors, are described and assessed. The tradeoffs and design issues of direct-sequence multiple-input multiple-output with spatial multiplexing or beamforming are determined.
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References
F. Adachi, M. Sawahashi, and K. Okawa, “Tree-structured Generation of Orthogonal Spreading Codes with Different Lengths for Forward Link of DS-CDMA Mobile Radio,” IEE Electronics Letters, vol. 33, pp. 27–28, Jan. 1997.
J. R. Barry, E. A. Lee, and D. G. Messerschmitt, Digital Communication, 3rd ed., Kluwer Academic, 2004.
H. Cai, Y. Yang, Z. Zhou, and X. Tang, “Strictly Optimal Frequency-Hopping Sequence Sets With Optimal Family Sizes,” IEEE Trans. Inf. Theory, vol. 62, pp. 1087–1093, Feb. 2016.
T. M. Cover and J. M. Thomas, Elements of Information Theory, 2nd ed., Wiley, 2006.
S. Emami, “UWB Communication Systems: Conventional and 60 GHz: Principles, Design, and Standards,” Springer, 2013.
Y. Fang, G. Han, P. Chen, F. C. M. Lau, G. Chen, and L. Wang, “A Survey on DCSK-based Communication Systems and Their Application to UWB Scenarios,” IEEE Commun. Surveys Tut.,vol. 18, pp. 1804–1837, fourth quarter, 2016.
M. Goresky and A. Klapper, Algebraic Shift Register Sequences, Cambridge Univ. Press, 2012.
A. R. Hammons and P. V. Kumar, “On a Recent 4-Phase Sequence Design for CDMA,” IEICE Trans. Commun., vol. E76-B, pp. 804–813, Aug. 1993.
V. Kuhn, Wireless Communications over MIMO Channels, Wiley, 2006.
T. G. Macdonald and M. B. Pursley, “The Performance of Direct-Sequence Spread Spectrum with Complex Processing and Quaternary Data Modulation,” IEEE J. Select. Areas Commun., vol. 18, pp. 1408–1417, Aug. 2000.
D. Peng and P. Fan, “Lower bounds on the Hamming auto- and cross correlations of frequency-hopping sequences,” IEEE Trans. Inf.Theory, vol. 50, pp. 2149–2154, Sept. 2004.
J. G. Proakis and M. Salehi, Digital Communications, 5th ed., McGraw-Hill, 2008.
M. B. Pursley, “Spread-Spectrum Multiple-Access Communications,” in Multi-User Communications Systems, G. Longo, ed., Springer-Verlag, 1981.
M. B. Pursley, D. V. Sarwate, and W. E. Stark, “Error Probability for Direct-Sequence Spread-Spectrum Multiple-Access Communications—Part 1: Upper and Lower Bounds,” IEEE Trans. Commun., vol. 30, pp. 975–984, May 1982.
D. S. Saini and M. Upadhyay, “Multiple Rake Combiners and Performance Improvement in 3G and Beyond WCDMA Systems,” IEEE Trans. Veh. Technol., vol. 58, pp. 3361–3370, Sept. 2009.
M. Sawahashi, K. Higuchi, H. Andoh, and F. Adachi, “Experiments on Pilot Symbol-Assisted Coherent Multistage Interference canceler for DS-CDMA Mobile Radio,” IEEE J. Select. Areas Commun., vol. 20, pp. 433–449, Feb. 2002.
C. Schlegel and A. Grant, Coordinated Multiuser Communications. Springer, 2006.
S-Y. Sun, H.-H. Chen, and W.-X. Meng, “A Survey on Complementary-Coded MIMO CDMA Wireless Communications,” IEEE Commun. Surveys Tut., vol. 17, pp. 52–69, first quarter, 2015.
W. M. Tam, F. C. M. Lau, and C. K. Tse, Digital Communications with Chaos: Multiple Access Techniques and Performance Evaluation,Oxford, U. K.: Elsevier, 2007.
X. Tan and J. M. Shea, “An EM Approach to Multiple-Access interference Mitigation in Asynchronous Slow FHSS Systems,” IEEE Trans. Wireless Commun., vol. 7, pp. 2661–2670, July 2008.
D. Torrieri, “Performance of Direct-Sequence Systems with Long Pseudonoise Sequences,” IEEE J. Select. Areas Commun., vol. 10, pp. 770–781, May 1992.
S. Verdu, Multiuser Detection,Cambridge Univ. Press, 1998.
S. P. Weber, J. G. Andrews, X. Yang, and G. de Veciana, “Transmission Capacity of Wireless Ad Hoc Networks with Successive Interference Cancellation,” IEEE Trans. Inf. Theory, vol. 53,pp. 2799–2812, Aug. 2007.
S. Xie and S. Rahardja, “Performance Evaluation for Quaternary DS-SSMA Communications with Complex Signature Sequences over Rayleigh-fading Channels,” IEEE Trans. Wireless Commun., vol. 4, pp. 266–77, Jan. 2005.
Z. Zhou, X. Tang, X. Niu, and U. Parampalli, “New Classes of Frequency-Hopping Sequences With Optimal Partial Correlation,” IEEE Trans. Inf. Theory,, vol. 58, pp.453–458, Jan. 2012.
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Torrieri, D. (2018). Code-Division Multiple Access. In: Principles of Spread-Spectrum Communication Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-70569-9_7
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DOI: https://doi.org/10.1007/978-3-319-70569-9_7
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