By Olkkonen H. (ed.)
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V. McCanny, (2002). A mixed cost-function adaptive algorithm for ADSL time-domain equalization, Proc. of the IEEE International Conference on Communication (ICC 2002), Vol. 3, New York, pp. 1798-1802. Yu, W. and Cioffi, J. M. (2001). On Constant Power Water-Filling, IEEE ICC. 0 2 A Scalable Architecture for Discrete Wavelet Transform on FPGA-Based System Xun Zhang Institut Superieur d’Electronique de Paris-ISEP France 1. Mallet, 1999) has been widely used as an alternative to the existing time-frequency representations such as DFT and DCT.
2 (ITU-T, 2003). For fair comparison, two systems are simulated, which are based on DWMT and DMT transceiver using time-domain equalization (TEQ) techniques for ADSL channel in the presence of AWGN and crosstalk noise. The channel is considered to be stationary during symbol duration. MatLab is used for all this simulation purpose and the parameters for simulation are specified in Table 2. 208 MHz Modulation M-QAM (2, 4, 8, 16, 32, 64) M-QAM (2, 4, 8, 16, 32, 64) Cyclic Prefix None 20% FFT size (N) - 512 Wavelet-level 2 - Number of bits/sub-channel 1 to 6 1 to 6 Table 2.
Moreover the MMSE-TEQ technique for DWMT system shows an improvement of 2 dBs in Eb/No over ZF-TEQ technique for DWMT and a 3 dB gain over the ZF-TEQ equalized DMT system, at a BER of 1E-4. Discrete Wavelet Multitone Modulation for ADSL & Equalization Techniques 21 Fig. 18. BER Comparison of DWMT & DMT systems for ADSL channel with AWGN, NEXT & FEXT. 5. Pros & cons of applying DWT in multicarrier modulation techniques DWMT modulation based transceiver, appears to be an interesting choice, when utilizing multi-carrier modulation techniques in wireline systems.