Browse > Article

Implementation of WLAN Baseband Processor Based on Space-Frequency OFDM Transmit Diversity Scheme  

Jung Yunho (Dept. of Electrical and Electronic Eng. Yonsei Univ.)
Noh Seungpyo (Dept. of Electrical and Electronic Eng. Yonsei Univ.)
Yoon Hongil (Dept. of Electrical and Electronic Eng. Yonsei Univ.)
Kim Jaeseok (Dept. of Electrical and Electronic Eng. Yonsei Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.42, no.5, 2005 , pp. 55-62 More about this Journal
Abstract
In this paper, we propose an efficient symbol detection algorithm for space-frequency OFDM (SF-OFDM) transmit diversity scheme and present the implementation results of the SF-OFDM WLAN baseband processor with the proposed algorithm. When the number of sub-carriers in SF-OFDM scheme is small, the interference between adjacent sub-carriers may be generated. The proposed algorithm eliminates this interference in a parallel manner and obtains a considerable performance improvement over the conventional detection algorithm. The bit error rate (BER) performance of the proposed detection algorithm is evaluated by the simulation. In the case of 2 transmit and 2 receive antennas, at $BER=10^{-4}$ the proposed algorithm obtains about 3 dB gain over the conventional detection algorithm. The packet error rate (PER), link throughput, and coverage performance of the SF-OFDM WLAN with the proposed detection algorithm are also estimated. For the target throughput at $80\%$ of the peak data rate, the SF-OFDM WLAN achieves the average SNR gain of about 5.95 dB and the average coverage gain of 3.98 meter. The SF-OFDM WLAN baseband processor with the proposed algorithm was designed in a hardware description language and synthesized to gate-level circuits using 0.18um 1.8V CMOS standard cell library. With the division-free architecture, the total logic gate count for the processor is 945K. The real-time operation is verified and evaluated using a FPGA test system.
Keywords
Space-Frequency OFDM transmit diversity scheme; symbol detection; WLAN;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Stefan A. Fechtel and Alfred Blainckner, 'Efficient FFT and equalization for OFDM receivers,' IEEE Trans. Consumer Electron., vol. 45, no. 4, Nov. 1999   DOI   ScienceOn
2 A. Doufexi, S. Armour, A. Nix, P. Karlsson, and D. Bull, 'Range and throughput enhancement of wireless local area networks using smart sectorized antennas,' IEEE Trans. Wireless Comm., vol. 3, no. 5, pp. 1437-1443, Sep. 2004   DOI   ScienceOn
3 Enver Cavus ad Babak Daneshrad, 'A computationally efficient algorithm for spacetime block decoding,' Proc. International Conf. on Comm., vol. 4, pp. 1157-1162, Jun. 2001   DOI
4 A. R. Dias, s. Rougqutte, and K Gosse, 'MTMR channel estimation an pilot design in the context of space time block coded OFDM-based WLANs,' Proc. IST Summit, 2000
5 IEEE Std 802. 11a-l999, Part11: WIreless LAN medium access control (MAC) and physical layer (PRY) specifications: High-speed physical layer in the 5GHz band, 1999
6 A. Doufexi, S. Armour, M. Butler, A. Nix, and D. Bull, 'A study of the performance of HIPERLAN/2 and IEEE 802.11a physical layers,' Proc. Vehicular Technology Conf. Spring, May 2001   DOI
7 V. Tarokh, H. Jafarkhani, and A. R. Calderbank, 'Space-time block coding for wireless commnications: performance results,' IEEE J. on Selected Areas in Comm., vol. 17, no. 3, pp. 451-460, Mar. 1999   DOI   ScienceOn
8 J. Heiskala and J. Terry, 'OFDM wireless LANs: a theoretical and practical guide,' Sams Publishing, 2001, pp. 88-105
9 K. F. Lee and D. B. Williams, 'A space-time coded transmitter diversity technique for frequency selective fading channels,' Proc, IEEE Sensor Array Multichannel Signal Processing Workshop, Cambridge, MA, pp.149-152, Mar. 2000   DOI
10 K. F. Lee and D. B. Williams, 'A space- frequency transmitter diversity technique for OFDM systems,' Proc. Global Tele- communications Conf., San Francisco, CA, pp. 1473-1477, Nov. 2000   DOI
11 Li Lihua, Tao Xiaofeng, Zhang Ping, and Harald Haas, 'A practical space-frequency block coded OFDM scheme for fast fading broadband channels,' Proc. Personal, Indoor and Mobile Radio Communications Conf., vol. 1, pp, 212-216, Sept. 2002
12 M. Torabi and M. Soleymani, 'Adaptive modulation for OFDM systems using space-frequency block codes,' Proc. Wireless Communications and Networking Conf., pp. 61-65, 2003
13 J. Medbo and P. Schramm, 'Channel models for HIPERLAN/2 in different indoor scenarios,' ETSI BRAN document no. 3ERI085B, 1998
14 R. Piechocki, P. Fletcher, A. Nix, N. Canagarajah, and J. McGeehan, 'A measurement based feasibility study of space-frequency MlMO detection and decoding techniques for next generation wireless LANs,' IEEE Trans. Consumer Electron., vol. 48, no. 3, pp. 732-737, Aug. 2002   DOI   ScienceOn
15 G. Ren, H. Zhang, and Y. Chang, 'A novel scheme for space-time block coding with a variable transmit diversity gain in OFDM systems,' IEEE Trans. Consumer Electron., vol. 50, no. 2, pp. 478-483, May 2004   DOI   ScienceOn
16 A. Wittneben, 'A new bandwidth efficient transmit antenna modulation diversity scheme for linear digital modulation,' Proc. International Conf. on Comm., Geneva, Switzerland, vol. 3, pp. 1630-1634, May 1993   DOI