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Rotated precoder-based OFDM system robust to channel spectral nulls and with reduced PAPR

  • Xin-Lin Huang
  • Gang Wang
  • Fei Hu
Article

Abstract

Recently, the precoded orthogonal frequency division multiplexing (OFDM) was proposed to show robustness to intersymbol interference channels with spectral nulls. However, due to inserting (M-K) zeros between each two sets of K consecutive information symbols, the average transmitting power of the precoded OFDM system reduces by 10 log10 (M/K) dB compared with the conventional OFDM system. Under the same points, inverse fast Fourier transformation (IFFT), the precoded OFDM system has a higher peak-to-average power ratio (PAPR) compared with the conventional OFDM system. This paper proposes a rotated precoder-based OFDM system robust to channel spectral nulls and with reduced PAPR. The rotated precoder makes the N-point IFFT with N/2 zeros padded. Since half of the information symbols for IFFT are zeros, we have the PAPR reduced by 10 log10 2≈3 dB approximately, compared with the conventional precoded OFDM system. We also show that the proposed OFDM system has the same bit error rate (BER) performance as the conventional precoded OFDM system. Both theoretical performance analysis and simulation results are presented to verify the correctness of our theory analysis.

Keywords

Spectral nulls Bit error rate (BER) Peak-to-average power ratio (PAPR) Rotated precoder Inverse fast Fourier transformation (IFFT) Precoded OFDM 

References

  1. 1.
    Feiten A, Mathar R, Reyer M (2008) Rate and power allocation for multiuser OFDM: an effective heuristic verified by branch-and-bound. IEEE Transactions on Wireless Communications 7(1):60–64CrossRefGoogle Scholar
  2. 2.
    Bansal G, Hossain J, Bhargava VK (2008) Optimal and suboptimal power allocation schemes for OFDM-based cognitive radio systems. IEEE Transactions on Wireless Communications 7(11):4710–4718CrossRefGoogle Scholar
  3. 3.
    Zhang H, Xia XG (2006) Iterative decoding and demodulation for single-antenna vector OFDM systems. IEEE Transactions on Vehicular Technology 55(4):1447–1454CrossRefGoogle Scholar
  4. 4.
    Radio broadcasting systems; digital audio broadcasting (DAB) to mobile, portable and fixed receiver, ETSI EN 300 401 V1.3.3 (2001-5), 2001Google Scholar
  5. 5.
    Nee RV, Prasad R (2000) OFDM for wireless multimedia communications: Artech House PublisherGoogle Scholar
  6. 6.
    Wu H, Huang X, Xu D (2006) Novel semi-blind ICI equalization algorithm for wireless OFDM systems. IEEE Transactions on Broadcasting 52(2):211–218CrossRefMathSciNetGoogle Scholar
  7. 7.
    Draft supplement to Standard for Telecommunications and Information Exchange Between Systems-LAN/MSN Specific Requirements-Part 11: wireless MAC and PHY specifications: high speed physical layer in the 5 GHz band, IEEE 802.11, 1999Google Scholar
  8. 8.
    Project IEEE 802.11 g Standard for Higher Rate (20 + Mbps) Extensions in the 2.4 GHz Band, IEEE P802.11-TASK GROUP G-, 2003Google Scholar
  9. 9.
    Manton JH (2002) The convex geometry of subchannel attenuation coefficients in linearly precoded OFDM systems. IEEE Transactions on Information Theory 48(5):1203–1206zbMATHCrossRefMathSciNetGoogle Scholar
  10. 10.
    Shah SFA, Tewfik H (2008) Design and analysis of post-coded OFDM systems. IEEE Transactions on Wireless Communications 7(12):4907–4918CrossRefGoogle Scholar
  11. 11.
    Xia XG (2001) Precoded and vector OFDM robust to channel spectral nulls and with reduced cyclic prefix length in single transmit antenna systems. IEEE Transactions on Communications 49(8):1363–1374zbMATHCrossRefGoogle Scholar
  12. 12.
    Zhang H, Xia X-G, Zhang Q, Zhu W (2002) Precoded OFDM with adaptive vector channel allocation for scalable video transmission over frequency-selective fading channels. IEEE Transactions on Mobile Computing 1(2):132–142CrossRefGoogle Scholar
  13. 13.
    Zhang H, Xia X-G, Cimini LJ Jr, Ching PC (2005) Synchronization techniques and guard-band-configuration scheme for single-antenna vector-OFDM systems. IEEE Transactions on Wireless Communications 4(5):2454–2464CrossRefGoogle Scholar
  14. 14.
    Lin YP, Phoong SM (2003) BER minimized OFDM systems with channel independent precoders. IEEE Transactions on Signal Processing 51(9):2369–2380CrossRefGoogle Scholar
  15. 15.
    Yücek T, Arslan H (2007) MMSE noise plus interference power estimation in adaptive OFDM systems. IEEE Transactions on Vehicular Technology 56(6):3857–3863CrossRefGoogle Scholar
  16. 16.
    Slimane SB (2007) Reducing the peak-to-average power ratio of OFDM signals through precoding. IEEE Transactions on Vehicular Technology 56(2):686–695CrossRefMathSciNetGoogle Scholar
  17. 17.
    Wiegandt DA, Wu Z, Nassar CR (2003) High-throughput, high-performance OFDM via pseudo-orthogonal carrier interferometry spreading codes. IEEE Transactions on Communications 51(7):1123–1134CrossRefGoogle Scholar

Copyright information

© Institut Télécom and Springer-Verlag 2010

Authors and Affiliations

  1. 1.Communication Research CenterHarbin Institute of TechnologyHarbinPeople’s Republic of China
  2. 2.Department of Electrical and Computer EngineeringThe University of AlabamaTuscaloosaUSA

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