Abstract
Orthogonal Frequency Division Multiplexing (OFDM) is an emerging multicarrier modulation scheme, which has been adapted for several wireless local area network (WLAN) systems and IEEE 802.16a (WIMAX) systems. The quality of service and performance sensitivity of different wireless services varies according to the channel, so the conventional OFDM is unsatisfactory. In this paper, we introduce an adaptive modulation scheme in association with OFDM systems. By using different modulation techniques we can send variable number of bits per symbol depending on the channel quality to achieve better throughput. We also remove the pilot bits from the transmitted data to increases the bandwidth efficiency. We propose a method to estimate the channel quality and Signal-to-Noise ratio (SNR) directly, without using any pilot bits.
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References
Huang, X., Wu, H.-C.: Novel Pilot-Free Adaptive Modulation for Wireless OFDM Systems. IEEE Transactions on Vehicular Technology 57(6) (November 2008)
Wong, C.H., Hanzo, L.: Upper-Bound Performance of a Wide-Band Adaptive Modem. IEEE Transactions on Communications 48(3) (March 2000)
Chow, P.S., Cioffi, J.M., Bingham, J.A.C.: A Practical Discrete Multitone Transceiver Loading Algorithm for Data Transmission over Spectrally Shaped Channels. IEEE Transactions on Communications 43(2/3/4) (February/March/April 1995)
Chung, J.Y., Guo, F., Ng, S.X., Hanzo, L.: Burst-by-burst Adaptive Joint-Detection CDMA/H.26L BasedWireless Video Telephony using TTCM and LDPC Code
Matzner, R., Englberger, F.: An SNR Estiiriatioii -Algorithrn Using Fourth-Order Moments, Institute for Coinmiin. Eugineeiing ET3, Federal Armed Forces University Munich, 85577 Neubiberg, Germany ”Siemens AG, 81359 Munich, Germany
Rappaport, T.S.: Wireless Communications, Principles and Practice, 2nd edn. Prentice–Hall, Englewood Cliffs (2002)
Benedict, T., Soong, T.: The joint estimation of signal and noise from the sum envelope. IEEE Trans. Inf. Theory IT-13(3), 447–454 (1967)
Mood, A.M., Graybill, F.A., Boes, D.C.: Introduction to the theory of statistics. McGraw Hill, New York (1974)
Prashad, R.: OFDM for Wireless Communications Systems. Artech House universal personal communications series (2000)
Haykin, S.: Communication Systems, 4th edn. Wiley, India (2010)
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Vinoth Babu, K., Ramachandra Reddy, G., Gupta, S., Chauhan, P., Patel, P. (2012). Throughput Improvement in Mobile OFDM System with Pilot Free Adaptive Modulation. In: Krishna, P.V., Babu, M.R., Ariwa, E. (eds) Global Trends in Computing and Communication Systems. ObCom 2011. Communications in Computer and Information Science, vol 269. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29219-4_45
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DOI: https://doi.org/10.1007/978-3-642-29219-4_45
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-29218-7
Online ISBN: 978-3-642-29219-4
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