A Cognitive Radio System Using Discrete Wavelet Multitone Modulation

A cognitive radio (CR) system is proposed to operate in the GSM band and the discrete wavelet multitone is adopted as the modulation scheme. This modulation has stronger side-lobe attenuation than the popular OFDM modulation and thus generates much lower adjacent channel leakage, making it suitable for applications with dynamically allocated spectrum. Signal and interference analysis of the adopted DWMT modulation is presented and signal processing techniques that tackle synchronization, equalization, and detection are developed. A DWMT baseband receiver is designed and verified by functional simulation. A digital baseband receiver IC is implemented for the proposed DWMT-based CR system. When the whole GSM band is available, the receiver IC can provide up to 153.6 Mbps of data transmission.

[1]  Henrique S. Malvar.  Extended lapped transforms: properties, applications, and fast algorithms , 1992, IEEE Trans. Signal Process..

[2]  Markku Renfors,et al.  Exponentially-modulated filter bank-based transmultiplexer , 2003, Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03..

[3]  Pei-Yun Tsai,et al.  OFDM Baseband Receiver Design for Wireless Communications , 2007 .

[4]  Kong-Aik Lee,et al.  On the Subband Orthogonality of Cosine-Modulated Filter Banks , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[5]  Leonard T. Bruton,et al.  3-D IIR filtering using decimated DFT-polyphase filter bank structures , 2006, IEEE Transactions on Circuits and Systems I: Regular Papers.

[6]  T. Weiss,et al.  Synchronization Algorithms and Preamble Concepts for Spectrum Pooling Systems , 2003 .

[7]  Joseph Mitola,et al.  Cognitive Radio An Integrated Agent Architecture for Software Defined Radio , 2000 .

[8]  Pei-Yun Tsai,et al.  A Low-Power Multicarrier-CDMA Downlink Baseband Receiver for Future Cellular Communication Systems , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.

[9]  Kwen-Siong Chong,et al.  A 16-Channel Low-Power Nonuniform Spaced Filter Bank Core for Digital Hearing Aids , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[10]  M. Suresh Babu,et al.  Efficient VLSI Architecture for Lifting-Based Discrete Wavelet Packet Transform , 2010 .

[11]  Peter N. Heller,et al.  DMT systems, DWMT systems and digital filter banks , 1994, Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications.

[12]  John G. Proakis,et al.  Comparison of DFT and cosine modulated filter banks in multicarrier modulation , 1994, 1994 IEEE GLOBECOM. Communications: The Global Bridge.

[13]  Homayoun Nikookar,et al.  A Review of Wavelets for Digital Wireless Communication , 2006, Wirel. Pers. Commun..

[14]  Joseph Mitola.  Cognitive Radio for Flexible Mobile Multimedia Communications , 2001, Mob. Networks Appl..

[15]  Markku Renfors,et al.  Efficient implementation of complex exponentially-modulated filter banks , 2003, Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03..

[16]  Keith M. Chugg,et al.  Near-optimal parallel distributed data detection for page-oriented optical memories , 1998 .