Multicarrier Modulation Using Perfect Reconstruction DFT Filter Bank Transceivers

Multicarrier modulation techniques such as discrete multitone (DMT) have been used for reliable digital data transmission in various applications, i.e. in digital subscriber line (DSL) and Wi-Fi products. It is a well known fact that the IFFT/FFT pair in DMT provides poor spectral selectivity due to the insufficient sidelobe attenuation of the subchannel frequency response. To remedy this problem, we propose to use perfect reconstruction DFT filter banks (achieving perfect inter-symbol interference cancellation) instead of DMT. In this case, spectral selectivity can be greatly improved. Equalization is performed via a zero-padding technique combined with QR factorization of the channel matrix. Experiments indicate that the proposed transceiver exhibits a significant improvement in terms of achievable bit rates in an environment where narrow band noise dominates