EXTENDING OFDM SYMBOLS TO REDUCE POWER CONSUMPTION

André B. J. Kokkeler, Gerard J. M. Smit

Abstract

Existing communication standards have limited capabilities to adapt to low SNR environments or to exploit low data rate requirements in a power efficient way. Existing techniques like e.g. control coding do not reduce the computational load when reducing data rates. In this paper, we introduce differential Extended Symbol OFDM (differential ES-OFDM) which is based on the transmission of symbols that are extended in time. This way it can operate at low SNR. Using differential BPSK modulation, approximately 2.1 dB SNR improvement per doubling of the symbol length (halving the bitrate) is obtained. The sensitivity to frequency offsets of differential ES-OFDM is basically independent of symbol extension. Extending symbols reduces the computational load on the radio modem within the transmitter which is essential to reduce overall power consumption. The differential ES-OFDMreceiver architecture also offers opportunities to reduce power consumption.

References

  1. Carroll, A. and Heiser, G. (2010). An analysis of power consumption in a smartphone. In Proceedings of the 2010 USENIX conference on USENIX annual technical conference, USENIXATC'10, pages 21-21, Berkeley, CA, USA. USENIX Association.
  2. Gaffney, B., Fagan, A., and Rickard, S. (2005). Upper bound on the probability of error for repetition mbofdm in the rayleigh fading channel. Ultra-Wideband, 2005. ICU 2005. 2005 IEEE International Conference on, pages 4 pp.-.
  3. Harada, M., Yamamoto, T., Okada, H., Katayama, M., and Ogawa, A. (2007). Reducing peak power for coded ofdm systems by multiple symbol mapping. Electronics and Communications in Japan (Part III: Fundamental Electronic Science), 90(3):67-76.
  4. Haykin, S. (2001). Communication Systems. John Wiley & Sons, Inc., fourth edition.
  5. Kokkeler, A. and Smit, G. (2011). A correlating receiver for ofdm at low snr. In IEEE 73rd Vehicular Technology Conference: VTC2011 - Spring.
  6. Lott, M. (1999). Comparision of frequency and time domain differential modulation in an ofdm system for wireless atm. Vehicular Technology Conference, 1999 IEEE 49th, 2:877-883 vol.2.
  7. Maeda, N., Atarashi, H., Abeta, S., and Sawahashi, M. (2002). Throughput comparison between vsf-ofcdm and ofdm considering effect of sectorization in forward link broadband packet wireless access. Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th, 1:47-51 vol.1.
  8. Mahesri, A. and Vardhan, V. (2005). Power consumption breakdown on a modern laptop. 3471:165-180.
  9. Medina, L. and Kobayashi, H. (2000). Proposal of ofdm system with data repetition. Vehicular Technology Conference, 2000. IEEE VTS-Fall VTC 2000. 52nd, 1:352-357 vol.1.
  10. Miller, L. and Lee, J. (1998). Ber expressions for differentially detected pi;/4 dqpsk modulation. Communications, IEEE Transactions on, 46(1):71 -81.
  11. Perrucci, G., Fitzek, H. F., and Widmer, J. (2011). Survey on energy consumption entities on smartphone platform. In IEEE 73rd Vehicular Technology Conference: VTC2011 - Spring.
  12. Rantala, E., Karppanen, A., Granlund, S., and Sarolahti, P. (2009). Modeling energy efficiency in wireless internet communication. In Proceedings of the 1st ACM workshop on Networking, systems, and applications for mobile handhelds, MobiHeld 7809, pages 67-68, New York, NY, USA. ACM.
  13. Simon, M. and Divsalar, D. (1992). On the implementation and performance of single and double differential detection schemes. Communications, IEEE Transactions on, 40(2):278-291.
  14. Tan, P. and Beaulieu, N. (2007a). Accurate ber performance comparison of frequency domain and time domain p/4-dqpsk ofdm systems. Electrical and Computer Engineering, 2007. CCECE 2007. Canadian Conference on, pages 195 -201.
  15. Tan, P. and Beaulieu, N. (2007b). Precise ber analysis of p/4-dqpsk ofdm with carrier frequency offset over frequency selective fast fading channels. Wireless Communications, IEEE Transactions on, 6(10):3770 -3780.
Download


Paper Citation


in Harvard Style

B. J. Kokkeler A. and J. M. Smit G. (2012). EXTENDING OFDM SYMBOLS TO REDUCE POWER CONSUMPTION . In Proceedings of the 1st International Conference on Smart Grids and Green IT Systems - Volume 1: SMARTGREENS, ISBN 978-989-8565-09-9, pages 257-262. DOI: 10.5220/0003950002570262


in Bibtex Style

@conference{smartgreens12,
author={André B. J. Kokkeler and Gerard J. M. Smit},
title={EXTENDING OFDM SYMBOLS TO REDUCE POWER CONSUMPTION},
booktitle={Proceedings of the 1st International Conference on Smart Grids and Green IT Systems - Volume 1: SMARTGREENS,},
year={2012},
pages={257-262},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0003950002570262},
isbn={978-989-8565-09-9},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 1st International Conference on Smart Grids and Green IT Systems - Volume 1: SMARTGREENS,
TI - EXTENDING OFDM SYMBOLS TO REDUCE POWER CONSUMPTION
SN - 978-989-8565-09-9
AU - B. J. Kokkeler A.
AU - J. M. Smit G.
PY - 2012
SP - 257
EP - 262
DO - 10.5220/0003950002570262