In this paper, a diamond shape pilot arrangement for OFDM channel estimation is investigated. Such arrangement will decrease the number of pilots transmitted over the communication channel, which will in turn increase data throughput while maintaining acceptable accuracy of the channel estimation. The adaptive antenna array (AAA) is combined with orthogonal frequency division multiplexing (OFDM) to combat the intersymbol interference (ISI) and the directional interferences.
In this paper, The optimum beamformer weight set is obtained based on minimum bit error rate (MBER) criteria in diamond-type pilot-assisted in 3GPP long term evolution (LTE) OFDM systems under multipath fading channel. The simulation results show that the quadrature phase shift keying signaling based on MBER technique utilizes the antenna array elements more intelligently than the standard minimum mean square error (MMSE) technique.
L. Fan, H. Zhang and C. He," Minimum Bit Error Beamforming for Pre-FFT OFDM Adaptive Antenna Array," IEEE International Conference, 25-28 Sept. 2005.
S. Seydnejad and S. Akhzari, "A Combined Time-Frequency Domain Beamforming Method for OFDM Systems," 2010 International ITG Workshop on Smart Antennas, IEEE, 23-24 Feb. 2010.
S. Chen, N. N. Ahmad and L. Hanzo, "Adaptive Minimum Bit-Error Rate Beamforming," IEEE Trans. on Wireless Commun., vol. 4, no. 2, pp.341-348, March 2005.
Z. Lei and P. S. Chin, “Post and Pre-FFT Beamforming in an OFDM System," Proc. of IEEE Vehicular Tech. Conf., vol. 1, pp. 39-43, 17-19 May 2004.
J. Via´ , V. Elvira, I. Santamari´a and R. Eickhoff, "Minimum BER Beamforming in the RF Domain for OFDM Transmissions and Linear Receivers," IEEE Int. Conf. on Acoustics, Speech and Signal Proc. (ICASSP 2009), Taipei, Taiwan, Apr. 2009.
S. Hara, M. Budsabathon and Y. Hara, "A Pre-FFT OFDM Adaptive Antenna Array with Eigenvector Combining", IEEE International Conference on Commun., vol. 4, pp. 2412 - 2416, June 2004.
T. A. Samir, S. Elnoubi and A. Elnashar, "Block Shanno MBER Beamformimg," International Symposium on Signal Processing and Its Applications (ISSPA 2007), Sharjah, UAE, 12-15 Feb. 2007.
S. Chen, A. K. Samingan and B. Mulgrew, "Adaptive Minimum-BER Linear Multiuser Detection for DS-CDMA Signals in Multipath Channels," IEEE Trans. on Signal Process., vol. 49, no. 6, pp. 1240-1247, June 2001.
T. A. Samir, S. Elnoubi and A. Elnashar, "Block Shanno Minimum Bit Error Rate Beamforming," IEEE Trans. on Vehicular Technology, vol. 57, no. 5, September 2008.
3GPP, Release 8 V0.0.3, "Overview of 3GPP Release 8: Summary of all Release 8 Features," November 2008.
M. Hsieh and C. We, "Channel Estimation for OFDM Systems Based on Comb-Type Pilot Arrangement in Frequency Selective Fading Channels," IEEE Transactions on Wireless Communication, vol. 2, no. 1, pp. 217-225, May 2009.
M. Morelli and U. Mengali, "A Comparison of Pilot-aided Channel Estimation Methods for OFDM Systems," IEEE Transactions on Signal Processing, vol. 49, pp.3065–3073, December 2001.
W. Abdallah, "Adaptive Minimum Bit Error Rate Beamforming Assisted QPSK for Pre-FFT OFDM Communication System," NNGT Int. Journal on Networking and Communications, vol. 1, July 2014.
S. Chen, L. Hanzo, N. N. Ahmad and A. Wolfgang, "Adaptive Minimum Bit Error Rate Beamforming Assisted QPSK Receiver," IEEE Communications Society, 2004.
S. Chen, A. Livingstone, H.Q. Du and L. Hanzo, "Adaptive Minimum Symbol Error Rate Beamforming Assisted Detection for Quadrature Amplitude Modulation," IEEE Trans. on Wireless Communications, vol. 7 , no. 4, pp. 1140-1145, April 2008.
S. R. Seydnejad and S. Akhzari, "Performance Evaluation of Pre-FFT Beamforming Methods in Pilot -Assisted SIMO-OFDM Systems," Telecommunication Systems, Springer Science and Business Media, March 2015.