{"title":"Energy Efficient Transmission of Image over DWT-OFDM System","authors":"Lakshmi Pujitha Dachuri, Nalini Uppala","volume":81,"journal":"International Journal of Electrical and Computer Engineering","pagesStart":1264,"pagesEnd":1271,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/17353","abstract":"
In many applications retransmissions of lost packets are not permitted. OFDM is a multi-carrier modulation scheme having excellent performance which allows overlapping in frequency domain. With OFDM there is a simple way of dealing with multipath relatively simple DSP algorithms.<\/p>\r\n\r\n
In this paper, an image frame is compressed using DWT, and the compressed data is arranged in data vectors, each with equal number of coefficients. These vectors are quantized and binary coded to get the bit steams, which are then packetized and intelligently mapped to the OFDM system. Based on one-bit channel state information at the transmitter, the descriptions in order of descending priority are assigned to the currently good channels such that poorer sub-channels can only affect the lesser important data vectors. We consider only one-bit channel state information available at the transmitter, informing only about the sub-channels to be good or bad. For a good sub-channel, instantaneous received power should be greater than a threshold Pth<\/sub>. Otherwise, the sub-channel is in fading state and considered bad for that batch of coefficients. In order to reduce the system power consumption, the mapped descriptions onto the bad sub channels are dropped at the transmitter. The binary channel state information gives an opportunity to map the bit streams intelligently and to save a reasonable amount of power. By using MAT LAB simulation we can analysis the performance of our proposed scheme, in terms of system energy saving without compromising the received quality in terms of peak signal-noise ratio.<\/p>\r\n","references":" [1] Y. Li and G. L. Stueber, Orthogonal frequency division multiplexing for Wireless Communications, Springer, 2005.\r\n[2] S.Weinstein and P. Ebert,\u2016 Data transmission by frequency-division multiplexing using the discrete Fourier transform\u2016, IEEE Transactions on Communication Technology, vol. 19, no. 5, pp. 628\u2013634, October 1971.\r\n[3] M. K. Lakshmanan and H. Nikookar, \u201cA review of wavelets for digital wireless communication,\u201d Journal on Wireless Personal Communication, vol. 37, no.3-4, pp. 387-420, Springer, May 2006.\r\n[4] C. Christopoulos, A. Skodras, and T. Ebrahimi, \u201cThe JPEG2000 still image coding system: An overview,\u201d IEEE Trans. Consumer Electron, vol. 46, no. 4, pp. 1103\u2013127, Nov. 2000.\r\n[5] Kiani, A.; Baghersalimi, G.; Zanj, B., \"Performance assessment of DFT-OFDM and DWT-OFDM systems in the presence of the HPA nonlinearity,\" Telecommunications (ConTEL), Proceedings of the 2011 11th International Conference on, vol., no., pp.273, 278, 15-17 June 2011.\r\n[6] Al-Hinai, N.; Neville, K.; Sadik, A.Z.; Hussain, Z.M., \"Compressed image transmission over FFT-OFDM: A comparative study,\" Telecommunication Networks and Applications Conference, 2007. ATNAC 2007. Australasian, vol., no., pp.465, 469, 2-5 Dec. 2007,doi: 10.1109\/ATNAC.2007.4665272 .\r\n[7] Y. Li, \u201cPilot-symbol-aided channel estimation for OFDM in wireless systems,\u201d IEEE Trans. Veh. Techn, vol. 49, no. 4, pp. 1207\u2013215, June 2000.\r\n[8] Sharma, A.; De, S.; Gupta, H.M., \"Energy-efficient transmission of DWT image over OFDM fading channel,\" Communication Systems and Networks (COMSNETS), 2011 Third International Conference on , vol., no., pp.1,7, 4-8 Jan. 2011.\r\n[9] Y. S. Chan, P. C. Cosman, and L. B. Milstein, \u201cA cross-layer diversity technique for multi-carrier OFDM multimedia networks,\u201d IEEE Trans. Image Proc., vol. 15, no. 4, pp. 833\u2013847, Apr. 2006.\r\n[10] J. McEliece and W. E. Stark, \u201cChannels with block interference,\u201d IEEE Trans. info. Theory, vol. 30, no. 1, pp. 44\u201353, Jan. 1984.\r\n[11] T.S.Gagandeep* et al. \/ (IJAEST) International Journal of Advanced Engineering Sciences and Technologie Vol No. 9, Issue No. 1, 061 \u2013 067.\r\n[12] R. Knopp and P. A. Humblet, \u201cOn coding for block fading channels,\u201d IEEE Trans. info. Theory, vol. 46, no. 1, pp. 189\u2013205, Jan. 2000.<\/p>\r\n","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 81, 2013"}