Showing papers by "K.M.M. Prabhu published in 2007"
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TL;DR: This paper presents a class of multi-channel cosine-modulated filter banks satisfying the perfect reconstruction (PR) property using an IIR prototype filter and shows that it is possible to implement this filter bank with much lower number of arithmetic operations when compared to FIR filter banks with comparable performance.
Abstract: This paper presents a class of multi-channel cosine-modulated filter banks satisfying the perfect reconstruction (PR) property using an IIR prototype filter By imposing a suitable structure on the polyphase filter coefficients, we show that it is possible to greatly simplify the PR condition, while preserving the causality and stability of the system We derive closed-form expressions for the synthesis filters and also study the numerical stability of the filter bank using frame theoretic bounds Further, we show that it is possible to implement this filter bank with much lower number of arithmetic operations when compared to FIR filter banks with comparable performance The filter bank's modular structure also lends itself to efficient VLSI implementation
1 citations
01 Nov 2007
TL;DR: Simulation results show that this co-ordinate interleaving technique enhances system performance without reducing the system rate.
Abstract: We study the use of co-ordinate interleaving technique for reducing the effect of frequency offset in OFDM communication systems. The inter-carrier interference effect (ICI) due to frequency offset is reduced by increasing the carrier power using CI techniques. The performance of OFDM with co-ordinate interleaving is compared with the conventional coding technique for combating the frequency offset. Simulation results show that this interleaving technique enhances system performance without reducing the system rate.