Radiotekhnika
Publishing house Radiotekhnika

"Publishing house Radiotekhnika":
scientific and technical literature.
Books and journals of publishing houses: IPRZHR, RS-PRESS, SCIENCE-PRESS


Тел.: +7 (495) 625-9241

 

Improving bandwidth and energy efficiencies of SEFDM-signals by introducing optimal subcarriers spectrum shapes

Keywords:

A.L. Gelgor – Ph.D.(Eng.), Associate Professor, Higher School of Applied Physics and Space Technologies, Peter The Great St. Petersburg Polytechnic University
E-mail: a_gelgor@mail.ru
A.I. Gorlov – Ph.D.(Eng.), Assistant, Higher School of Applied Physics and Space Technologies, Peter The Great St. Petersburg Polytechnic University
E-mail: anton.gorlov@yandex.ru
Nguyen Van Phe – Post-graduate Student, Higher School of Applied Physics and Space Technologies, Peter The Great St. Petersburg Polytechnic University
E-mail: nvphe1905@gmail.com


In this paper, we propose the new multicarrier signals, which derived from the OFDM signals by element-wise multiplying OFDM-symbol with a special pulse in time domain, thus introducing ISI. It is equivalent to linear modulation (convolution) of OFDM spectrum samples with a spectral pulse corresponding to the time domain pulse. Pulses are obtained as a solution of linear optimization problem with crite-rion of maximization free Euclidean distance. This optimization technique was firstly proposed by Said for single carrier partial response signals (PRS). The techniques of improving bandwidth efficiency for OFDM are usually called SEFDM, hence, we use the term PR-SEFDM to identify proposed signals. We propose to implement generation and detection of PR-SEFDM signals in frequency domain as it is done for OFDM. The Viterbi algorithm is used for demodulation by processing spectral samples of PR-SEFDM signals. This approach allows de-tection SEFDM signal with a large number of subcarriers. In this work, we analyze the PR-SEFDM mode with the controlled ISI, in which one subcarrier interferes with seven adjacent subcarriers. The numerical results of bandwidth and energy efficiencies for PR-SEFDM are presented. The proposed PR-SEFDM signals provides a lower bandwidth consumption with respect to SEFDM signals under a fixed energy consumption and fixed computational complexity of detection algorithm.

References:
  1. Anderson J.B., Rusek F., Owall V. Faster-Than-Nyquist Signaling, proc. of the IEEE. V. 101. issue 8. P. 1817−1830. 2013.
  2. Isam S., Kanaras I., Darwazeh I. A truncated SVD approach for fixed complexity spectrally efficient FDM receivers // Proc. IEEE Wireless Commun. Netw. Conf. 2011. P. 1584−1589.
  3. Isam S., Darwazeh I. Simple DSP-IDFT techniques for generating spectrally efficient FDM signals // IEEE, IET Int. Symp. Commun. Syst., Netw., Digital Signal Process. 2010. P. 20−24.
  4. Isam S., Darwazeh I. Design and performance assessment of fixed complexity spectrally efficient FDM receivers // Proc. IEEE 73rd Veh. Technol. Conf. 2011. P. 1−5.
  5. T. Xu, Darwazeh I. Bandwidth Compressed Carrier Aggregation // IEEE Int. Conf. on Communication Workshop (ICCW). 2015. P. 1107−1112.
  6. T. Xu, Darwazeh I. Spectrally efficient FDM: Spectrum saving technique for 5G? // 1st Int. Conf on 5G for Ubiquitous Connectivity (5GU). 2014. P. 273−278.
  7. Mazo J.E. Faster-than-Nyquist signaling // Bell System Technical Journal. 1975. V. 54. № 8. P. 1451−1462.
  8. Liveris D., Georghiades C.N. Exploiting faster-than-Nyquist signaling // IEEE Trans. Comm. 2003. V. 51. № 9. P. 1502−1511.
  9. Said, Anderson J.B. Bandwidth-efficient coded modulation with optimized linear partial-response signals // IEEE Trans. Inform. Theory. 1998. V. 44. № 2. P. 701−713.
  10. Gorlov A.I., Gel’gor A.L., Nguen Van Fe. Ispol’zovanie optimal’ny’x finitny’x impul’sov kak sposob nailuchshego vvedeniya upravlyaemoj mezhsimvol’noj interferenczii // Radiotexnika. 2016. № 12. S. 112−120.
  11. Gel’gor A.L., Gorlov A.I., Nguen Van Fe. Povy’shenie e’ffektivnosti SEFDM putem zameny’ spektral’ny’x sinc-impul’sov na RRC-impul’sy’ // Radiotexnika. 2016. № 12. S. 105−111.
  12. Zavjalov S.V., Volvenko S.V., Makarov S.B. A method for increasing the spectral and energy efficiency SEFDM signals // IEEE Commun. Lett. December 2016. V. 20. № 12. P. 2382−2385.
  13. Makarov S.B., Zav’yalov S.V. Chastotnaya i e’nergeticheskaya e’ffektivnost’ neortogonal’ny’x mnogochastotny’x sistem peredachi soobshhenij // Radiotexnika. 2015. № 1. S. 50−59.
  14. Zavjalov S.V., Makarov S.B., Volvenko S.V. Application of Optimal Spectrally Efficient Signals in Systems with Frequency Division Multiplexing // Internet of Things, Smart Spaces, and Next Generation Networks and Systems. Springer International Publishing. 2014. P. 676−685.
  15. Ovsyannikova A.S., Zavjalov S.V., Makarov S.B., Volvenko S.V. Choosing Parameters of Optimal Signals with Restriction on Correlation Coefficient // Internet of Things, Smart Spaces, and Next Generation Networks and Systems. Springer International Publishing. 2017. P. 619−628.
  16. Ovsyannikova A.S., Zavjalov S.V., Makarov S.B., Volvenko S.V., Quang T.L. Spectral and energy efficiency of optimal signals with increased duration, providing overcoming «Nyquist Barrier» // Internet of Things, Smart Spaces, and Next Generation Networks and Systems. Springer International Publishing. 2017. P. 607−618.

© Издательство «РАДИОТЕХНИКА», 2004-2017            Тел.: (495) 625-9241                   Designed by [SWAP]Studio