Abstract
In this paper we analyze an architectural extension for a Sandbridge processor which encompasses a CORDIC functional unit and the associated instructions. Specifically, the first instruction is CFG_CORDIC that configure the CORDIC unit in one of the rotation and vectoring modes for circular, linear, and hyperbolic coordinate systems. The second instruction is RUN_CORDIC that launches CORDIC operations into execution. As case study, we consider channel estimation and correction of the Orthogonal Frequency Division Multiplexing (OFDM) demodulation. In particular, we propose a scheme to implement OFDM channel correction within the extended instruction set. Preliminary results indicate a performance improvement over the base instruction set architecture of more than 80% for doing channel correction, which translates to an improvement of 50% for the entire channel estimation and correction task.
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Glossner, J.C., Hokenek, E., Moudgill, M.: Multithreaded Processor for Software Defined Radio. In: Proceedings of the 2002 Software Defined Radio Technical Conference, San Diego, California, vol. I, pp. 195–199 (2002)
Schulte, M.J., Glossner, C.J., Mamidi, S., Moudgill, M., Vassiliadis, S.: A Low-Power Multithreaded Processor for Baseband Communication Systems. In: Pimentel, A.D., Vassiliadis, S. (eds.) SAMOS 2004. LNCS, vol. 3133, pp. 393–402. Springer, Heidelberg (2004)
Glossner, J.C., Schulte, M.J., Moudgill, M., Iancu, D., Jinturkar, S., Raja, T., Nacer, G., Vassiliadis, S.: Sandblaster Low-Power Multithreaded SDR Baseband Processor. In: Proceedings of the 3rd Workshop on Applications Specific Processors (WASP 2004), Stockholm, Sweden, pp. 53–58 (2004)
Volder, J.E.: The CORDIC trigonometric computing technique. IRE Transactions on Electronic Computers EC-8, 330–334 (1959)
Walther, J.: A unified algorithm for elementary functions. In: Proceedings of the Spring Joint Computer Conference of the American Federation of Information Processing Societies (AFIPS), Arlington, Virginia, U.S.A., vol. 38, pp. 379–385. AFIPS Press (1971)
Golub, G.H., van Loan, C.F.: Matrix Computations, 3rd edn. The Johns Hopkins University Press (1996)
Strang, G.: Introduction to Linear Algebra, 3rd edn. Wellesley-Cambridge Press (2003)
van Nee, R.D., Prasad, R. (eds.): OFDM for Wireless Multimedia Communications. Artech House Publishers (2000)
European Telecommunications Standards Institute: Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television (2004)
Speth, M., Fechtel, S., Fock, G., Meyr, H.: Optimum Receiver Design for OFDM-Based Broadband Transmission – Part II: A Case Study. IEEE Transactions on Communications 49, 571–578 (2001)
Frescura, F., Pielmeier, S., Reali, G., Baruffa, G., Cacopardi, S.: DSP-Based OFDM Demodulator and Equalizer for Professional DVB-T Receivers. IEEE Transactions on Broadcasting 45, 323–332 (1998)
Tong, L., Sadler, B.M., Dong, M.: Pilot-Assisted Wireless Transmissions: General Model, Design Criteria, and Signal Processing. IEEE Signal Processing Magazine 21, 12–25 (2004)
Sebot, J., Drach, N.: SIMD ISA Extensions: Reducing Power Consumption on a Superscalar Processor for Multimedia Applications. In: IEEE Symposium on Low-Power and High-Speed Chips (Cool Chips) IV, Tokyo, Japan (2001)
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Sima, M., Glossner, J., Iancu, D., Ye, H., Iancu, A., Hoane, A.J. (2005). CORDIC-Augmented Sandbridge Processor for Channel Equalization. In: Hämäläinen, T.D., Pimentel, A.D., Takala, J., Vassiliadis, S. (eds) Embedded Computer Systems: Architectures, Modeling, and Simulation. SAMOS 2005. Lecture Notes in Computer Science, vol 3553. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11512622_17
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DOI: https://doi.org/10.1007/11512622_17
Publisher Name: Springer, Berlin, Heidelberg
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