- Research Article
- Open Access
Resource Allocation with Adaptive Spread Spectrum OFDM Using 2D Spreading for Power Line Communications
EURASIP Journal on Advances in Signal Processing volume 2007, Article number: 020542 (2007)
Bit-loading techniques based on orthogonal frequency division mutiplexing (OFDM) are frequently used over wireline channels. In the power line context, channel state information can reasonably be obtained at both transmitter and receiver sides, and adaptive loading can advantageously be carried out. In this paper, we propose to apply loading principles to an spread spectrum OFDM (SS-OFDM) waveform which is a multicarrier system using 2D spreading in the time and frequency domains. The presented algorithm handles the subcarriers, spreading codes, bits and energies assignment in order to maximize the data rate and the range of the communication system. The optimization is realized at a target symbol error rate and under spectral mask constraint as usually imposed. The analytical study shows that the merging principle realized by the spreading code improves the rate and the range of the discrete multitone (DMT) system in single and multiuser contexts. Simulations have been run over measured power line communication (PLC) channel responses and highlight that the proposed system is all the more interesting than the received signal-to-noise ratio (SNR) is low.
Lampe LH-J, Huber JB: Bandwidth efficient power line communications based on OFDM. International Journal of Electronics and Communications 2000,54(1):2-12.
Del Re E, Fantacci R, Morosi S, Seravalle R: Comparison of CDMA and OFDM techniques for downstream power-line communications on low voltage grid. IEEE Transactions on Power Delivery 2003,18(4):1104-1109. 10.1109/TPWRD.2003.817517
Cioffi J: A multicarrier primer. In Tech. Rep. T1E1.4/91–157. ANSI, Washington, DC, USA; committee contribution, 1991
Forney GD Jr., Wei L-F: Multidimensional constellations—part I: Introduction, figures of merit, and generalized cross constellations. IEEE Journal on Selected Areas in Communications 1989,7(6):877-892. 10.1109/49.29611
Isson O, Brossier J-M, Mestdagh D: Multi-carrier bit-rate improvement by carrier merging. Electronics Letters 2002,38(19):1134-1135. 10.1049/el:20020754
Mallier S, Nouvel F, Baudais J-Y, Gardan D, Zeddam A: Multi-carrier CDMA over copper lines—Comparison of performances with the ADSL system. Proceedings of the 1st International Workshop on Electronic Design, Test & Applications (DELTA '02), January 2002, Christchurch, New Zealand 450–452.
Crussière M, Baudais J-Y, Hélard J-F: adaptive linear precoded DMT as an efficient resource allocation scheme for power-line communications. Proceedings of IEEE Global Telecommunications Conference (GLOBECOM '06), November 2006, San Francisco, Calif, USA 1–5.
Crussière M, Baudais J-Y, Hélard J-F: Improved throughput over wirelines with adaptive MC-DS-CDMA. Proceedings of the 9th IEEE International Symposium on Spread Spectrum Techniques and Applications, August 2006, Manaus, Amazon, Brazil 143–147.
Crussière M, Baudais J-Y, Hélard J-F: Adaptive spread-spectrum multicarrier multiple-access over wirelines. IEEE Journal on Selected Areas in Communications 2006,24(7):1377-1388.
Giannakis GB, Anghel PA, Wang Z: Generalized multicarrier CDMA: Unification and linear equalization. EURASIP Journal on Applied Signal Processing 2005,2005(5):743-756. 10.1155/ASP.2005.743
Hedayat AS, Sloane NJA, Stufken J: Orthogonal Arrays: Theory and Applications. Springer, New York, NY, USA; 1999. chapter 7
Hara S, Prasad R: Overview of multicarrier CDMA. IEEE Communications Magazine 1997,35(12):126-133. 10.1109/35.642841
Kondo S, Milstein L: On the use of multicarrier direct sequence spread spectrum systems. Proceedings of IEEE Military Communications Conference (MILCOM '93), October 1993, Boston, Mass, USA 1: 52–56.
Yee N, Linnartz J-P, Fettweis G: Multi-carrier CDMA in indoor wireless radio networks. Proceedings of the International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '93), September 1993, Yokohama, Japan 109–113.
Kaiser S, Fazel K: A flexible spread-spectrum multi-carrier multiple-access system for multi-media applications. Proceedings of the 8th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC '97), September 1997, Helsinki, Finland 1: 100–104.
Wong CY, Cheng RS, Letaief KB, Murch RD: Multiuser OFDM with adaptive subcarrier, bit, and power allocation. IEEE Journal on Selected Areas in Communications 1999,17(10):1747-1758. 10.1109/49.793310
Sartenaer T, Vandendorpe L, Louveaux J: Balanced capacity of wireline multiuser channels. IEEE Transactions on Communications 2005,53(12):2029-2042. 10.1109/TCOMM.2005.860106
Rhee W, Cioffi JM: Increase in capacity of multiuser OFDM system using dynamic subchannel allocation. Proceedings of the 51st IEEE Vehicular Technology Conference (VTC '00), May 2000, Tokyo, Japan 2: 1085–1089.
About this article
Cite this article
Baudais, J., Crussière, M. Resource Allocation with Adaptive Spread Spectrum OFDM Using 2D Spreading for Power Line Communications. EURASIP J. Adv. Signal Process. 2007, 020542 (2007) doi:10.1155/2007/20542
- Channel State
- Channel State Information
- Measure Power
- Receiver Side
- Spreading Code