Hybrid Multi-Carrier CDMA Modulation based on VLSI

  • Madhusudhanan R
Keywords: Baseband receiver, code-division multiple access (CDMA), multi-carrier modulation.

Abstract

CDMA is a multiple access technique, which is based on spread spectrum modulation scheme. It allows a multiple users to access the channel simultaneously, with each user’s data being multiplied by a unique and orthogonal pseudo-random code sequence. Spread spectrum, as the name suggests, modulates the narrow band data and spreads it over a much wider bandwidth, thus transmitted data has a very low power spectral density. Moreover the inherent interference rejection capability of CDMA makes it suited to radio frequency environment. CDMA is interference limited, due to the multiple access interference of multiple users. Although orthogonal codes could result in no multiple access interference (MAI), in flat fading channels, the orthogonality will not be guaranteed in frequency selective fading channels because of inter-chip interference, which will cause MAI and degrade the system performance. One approach to suppress the effect of inter-chip interference in frequency selective fading channels is the combination of CDMA and multi- carrier modulation, such as OFDM that can achieve high spectral efficiency because the spectrum of successive sub- carriers is allowed. The combined CDMA system with OFDM is mainly categorized into MC/DS-CDMA and MCCDMA.

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Author Biography

Madhusudhanan R

Research scholar, Sathyabama University, Chennai, India.

References

1. Technical Specification Group Radio Access Network, Feasibility study for orthogonal frequency division multiplexing (OFDM) for UTRAN Enhancement, 3GPP, TR 25.892, V6.0.0, Jun. 2004.

2. Hara, S, and R. Prasad, “Overview of multicarrier CDMA”, IEEE Commun, Mag, vol. 35, no. 12, pp. 126–133, 1997.

3. 4MORE modem test and demonstration specification IST–4 More, Grenoble, France, 2004 [Online]. Available: http://www.ist- 4more.org

4. Physical layer simulation chain description IST–Matrice, , , 2002 [Online].Available: http://www.ist-matrice.org

5. Thomson, J., et al., “An Integrated 802.11a baseband and MAC processor”, in Dig. Tech. Papers ISSCC, 2002, pp. 92–93.

6. Eberle, W., et al., “80-Mb/s QPSK and 72-Mb/s 64-QAM flexible and scalable digital OFDM transceiver ASICs for wireless local area networks in the 5-GHz band,” IEEE J. Solid-State Circuits, vol. 36, no. 11, pp. 1829–1838, 2001.

7. Tsai, P. Y., H. Y. Kang, and T. D. Chiueh, “Design of a baseband transceiver for multi-carrier CDMA communication”, EURASIP J. Appl. Signal Process, no. 11, pp. 1645–1655, 2005.

8. Tsai, P. Y, and T. D. Chiueh, “A 1.1-V 9.9-mW MC-CDMA downlink baseband receiver IC for next-generation cellular communication systems”, in Proc. Asian Solid-State Circuits Conf., pp. 489–492, 2005.

9. Technical Specification Group (TSG) RAN WG4, Deployment Aspects, 3GPP, TR 25.943 V1.2.0.

10. Digital Audio Broadcasting (DAB); Guidelines and rules for implementation and operation; Part 3: Broadcast network, ETSI TR 101 496-3 V1.1.1, 2000.

11. Russel, M, and G. L. Stuber, “Interchannel interference analysis of OFDM in a mobile environment”, in Proc. IEEE VTC’95, Jul. 1995, vol. 2, pp. 820–824.

12.Spreading and Modulation (FDD), 3G TR 25.213 v3.3.0, 3GPP TSG RAN WG1, 1999.

13. Fazel, K, and L. Papke, “On the performance of convolutionally coded CDMA/OFDM for mobile communication system”, Proc. IEEE PIMRC’93, pp. 468– 472, 1993.

14. Schmidl, T. M, and D. C. Cox, “Robust frequency and timing synchronization for OFDM”, IEEE Trans. Commun., vol. 45, pp. 1613–1621, 1997.

15. Kim, Y. H., I. Song, S. Yoon, and S. R. Park, “An efficient frequency offset estimator for OFDM systems and its performance characteristics”, IEEE Trans. Vehic, Technol., vol. 50, no. 9, pp. 1307–1312, 2001.

16. Kim, Y., S. Choi, C. You, and D. Hong, “BER Computation of an MC-CDMA System with carrier frequency offset”, in Proc. 1999 IEEE Int. Conf. Acoust., Speech, Signal Process., Phoenix, AZ, pp. 2555–2558, 1999.

17. Fujisawa, T., et al., “A single-chip 802.11a MAC/PHY with a 32-b RISC processor”, IEEE J. Solid-State Circuits, vol. 38, no. 11, pp. 2001–2009, 2003.
Published
2009-12-20
Section
Articles