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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA, USA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - Efficient Multirate Filter Bank Generation with Full Spectral Utilization
摘要： An engine for generating FIR filters of bandwidths that are arbitrary multiplications of a particular quantity are proposed. The design is based on first replacing (cid:2208) by (cid:2208)(cid:2168), where (cid:2168) is an integer, in a low pass filter to result in a multiband filter with arbitrarily sharp transition band. The complement of this multiband filter is also generated. The important step in the proposed design is to feed this into a polyphase filter bank structure to isolate each band. The same is done to the complement of the multiband filter using a second polyphase filter bank structure. This way we have separate bands that could be combined with perfectly flat magnitude response and linear phase. It is shown that all combinations of individual bands could be computed in minimum possible logarithmic time while using the minimum number of additions. In this way, we have a structure to generate any filter response within the smallest band in the multiband structure using few additions. The filters could be left as complex i.e. single band or could be made real with addition to their corresponding conjugates at the cost of losing half the filter bands. The proposed dual filter bank structure could result in a multicarrier communications system that achieves full spectral utilization.
关键词： Full spectral utilization,FBMC,FIR filters,Polyphase,Multirate filter bank,Multicarrier communications
更新于2025-09-23 15:21:01
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Performance Evaluation Based on Effective Channel Analysis for FBMC-QAM System with Two Prototype Filters
摘要： In this paper, we evaluate the performance of a filter-bank multicarrier-quadrature amplitude modulation (FBMC-QAM) system with two prototype filters. We analyze the effective channel and derive the signal-to-interference ratio for additive white Gaussian noise channels and multipath fading channels. Based on the analysis, the characteristics of the effective channel according to various prototype filter sets and channel models are investigated. Utilizing the effective channels, we design two types of per-tone channel equalizers and evaluate the bit error rate performances by Monte Carlo simulations. Simulation results show that the FBMC-QAM system with two prototype filters can achieve almost the same bit error rate performance as orthogonal frequency division multiplexing with cyclic prefix by adopting the signal-level per-tone channel equalizer. Finally, the computational complexity of per-tone channel equalizers is analyzed.
关键词： signal-to-interference ratio (SIR),effective channel,per-tone channel equalizer,Multicarrier modulation,filter-bank multicarrier (FBMC)
更新于2025-09-19 17:15:36
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Design of a frequency spectrum-based versatile two-dimensional arbitrary shape filter bank: application to contact lens detection
摘要： A filter bank (FB) is an integral part of any image processing system. The designing of a FB generally involves modifying an existing FB or focusing on a particular property of the filter bank. Such FBs limit their use to a particular image. Through our work, we have devised a unique and novel approach for designing a two-dimensional arbitrary shape filter bank (2-D ASFB). This FB is inherently 2-D and eliminates the need for transforming a one-dimensional FB into 2-D. Its arbitrary nature expands its application to any image as compared to regular-shaped FBs currently in use. The novelty of the design lies in the fact that the designed FB can match the frequency spectrum of any image by reducing the error function between the frequency spectrum and the desired filter response of the FB. The error function has been minimized using the eigenfilter approach. After designing the low-pass analysis filter, perfect reconstruction constraint has been used to get a low-pass synthesis filter. In this paper, we have demonstrated the use of the 2-D ASFB specifically for contact lens detection (CLD). The proposed CLD system focuses on feature extraction using the 2-D ASFB. The support vector machine classifier is the same as in the existing systems. The results show improved correct classification rate as compared to the existing systems for IIITD and ND2013 contact lens database. This 2-D ASFB overcomes limitations posed by the existing filter banks with respect to separability, directionality, orthogonality, and shape. This FB can be effectively applied to any feature extraction application such as pattern recognition, biometrics, medical image processing.
关键词： Eigenfilter,Contact lens detection,Feature extraction,Filter bank,Frequency spectrum
更新于2025-09-09 09:28:46