Low-Power/High-Speed Scalable and Subchannelizable FFT Architecture for SOFDMA Application

Yang-Han Lee; Jen-Shiun Chiang; Yeh-Hsih Chou; Yu-Shih  Lee; Hsien-Wei Tseng; Ming-Hsueh Chuang

doi:10.6180/jase.2008.11.3.10

Low-Power/High-Speed Scalable and Subchannelizable FFT Architecture for SOFDMA Application

Yang-Han Lee This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Jen-Shiun Chiang¹ , Yeh-Hsih Chou^1,2, Yu-Shih Lee¹ , Hsien-Wei Tseng¹ and Ming-Hsueh Chuang¹

¹Department of Electrical Engineering, Tamkang University, Tamsui, Taiwan 251, R.O.C.
²Department of Electronic Engineering, St. John’s University, Tamsui, Taiwan 251, R.O.C.

Received: July 24, 2006
Accepted: August 9, 2007
Publication Date: September 1, 2008

Download Citation: ||https://doi.org/10.6180/jase.2008.11.3.10

ABSTRACT

In this paper, a scalable and subchannelizable innovative FFT architecture is proposed to provide with low-power and high-speed characteristics for SOFDMA application in IEEE 802.16 WiMAX communication and other fields that have features in SOFDMA applications. The scalability design uses multiplexing concept to build only one 1024-point and only one 2048-point FFT processors in an IEEE 802.16e and an IEEE 802.16-2004 WiMAX system respectively. The spirits of the subchannelization design are prohibited all of the unused arithmetic operations in the present inventive design to achieve low-power requirement when only a small subset of FFT outputs are of interests for a specific Subscriber Station in one session of a IEEE 802.16e or IEEE 802.16-2004 WiMAX systems. The SELDIF registry control methodology of the key control mechanism of the subchannelization design is also disclosed for the purposes of structure simplification and low-power/high-speed design in this paper. The performance on areas and power efficiency are analyzed based on MATLAB codes. A closed system platform is used to tune design parameters for chip implementation by using Agilent ADS tool.

Keywords: FFT, SOFDMA, WiMAX, SELDIF, Scalable, Subchannelizable

REFERENCES

[1] IEEE Standard 802.16e-2005, “IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems,” IEEE P802.16e/D12 (2005).
[2] Yaghoobi, H., “Scalable OFDMA Physical Layer in IEEE 802.16 WirelessMAN,” Intel Technology Journal, Vol. 8, pp. 201212 (2004).
[3] IEEE Standard 802.16-2004, “IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Access Systems,” IEEE STD 802.16-2004 (2004).
[4] Prepared on Behalf of WiMAX Forum, “Mobile WiMAX – Part I: A Technical Overview and Performance Evaluation,” WiMAX Forum, Feb. 2006, p. 15 (2006).
[5] Lee, Y. H., Jan, Y. G. and Chuang, M. H., et al., “CoEmulation Design for OFDM Baseband Transceiver,” Tamkang Journal of Science and Engineering, Vol. 9, pp. 7179 (2006).
[6] Cimini, L. J., “Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing,” Communications, IEEE Transactions on, Vol. 33, pp. 665675 (1985).
[7] Nee, R. Van and Prasad, R., OFDM For Wireless Multimedia Communications, Artech Hause Publishers, pp. 2025 (2000).
[8] Brigham, E. Oran, The Fast Fourier Transform and its Applications, Prentice-Hall, pp. 134135 (1988).
[9] Cooley, J. W. and Tukey, J. W., “An Algorithm for Machine Calculation of Complex Fourier Series,” Math. Computation, Vol. 19, pp. 297301 (1965).
[10] Munch, M., Wurth, B., Mehra, R., Sproch, J. and Wehn, N., “Automating RT-Level Operand Isolation to Minimize Power Consumption in Datapaths,” Proc. Design, Automation & Testing in Europe, pp. 624631 (2000).