Channel Estimation for Code Division Multiple Access Combined with Space Time Block Coding
In this paper, we present a combination of code division multiple access, space time block coding and orthogonal frequency division multiplexing technology. Also, the channel estimator related to this combination is proposed. In code division multiple access system, as the number of users increases the performance decreases. To overcome this problem, we apply space time block coding to improve the performance of the system. This approach is valid for non time dispersive channels. In the case of time dispersive channels, the problem of inter-symbol interference occurs. To cancel the inter-symbol interference, we use orthogonal frequency division multiplexing technology to transform the time dispersive channel into a number of non time dispersive channels. In this case, the received signal is simply decoded. To further improve the performance, channel estimator has to be very efficient. Therefore, we propose channel estimator based on the pilot symbols inserted periodically into the orthogonal frequency division multiplexing transmitted frame. At the receiver, interpolation filtering with specific gain and cutoff frequency is used to estimate the channel at all locations corresponding to orthogonal frequency division multiplexing frame. Several examples of real and estimated channels with different Doppler shifts are addressed. Simulation results of these examples show high performance and robustness of our approach.
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P.G. Conti, U. Gunawardana and R. Liyana-Pathirana, Loosely synchronized spreading codes in full-time early-late tracking loops, 2006 IEEE Radio and Wireless Symposium, pp. 17-19, January 2006.
Theodore S. Rappaport, Wireless Communications: Principles and Practice (Prentice Hall PTR, NJ., 2002).
S. M. Alamouti, A simple transmit diversity technique for wireless communications, IEEE JSAC, Volume 16, (Issue 8), 1998, Pages 1451-1458.
V. Tarokh, H. Jafarkhani, and A. R. Calderbank, Space-time block codes from orthogonal designs, IEEE Trans. Inform. Theory. Volume 45, 1999, Pages 1456-1467.
Fereidountabar, A., Cardarilli, G., Radio Link Design for Unmanned Aerial Vehicles (UAVs) with SQAM/TQAM Configuration and Alamouti/STBC Codes, (2015) International Journal on Communications Antenna and Propagation (IRECAP), 5 (4), pp. 241-247.
V. Tarokh, N. Sheshadri, and A.R. Calderbank, Space-time codes for high data rate wireless communication: performance criterion and code construction, IEEE Trans. Inform. Theory, Volume 44, (Issue 2), 1998, Pages 744-765.
X. Wang, Salim Alkhawaldeh, and Y. Shayan, A New approach to diversity and multiplexing gains for wideband MIMO channels, IEEE Transaction on Wireless Communications, Volume 6, (Issue 1), 2007, Pages 90-100.
L.J. Cimini, Jr., Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing, IEEE Trans. Comm., Volume COMM-33, July 1985, Pages 665-675.
Alkhawaldeh, S.A., Balanced space-frequency block coded OFDM antenna selection for wideband communications, (2012) International Review on Modelling and Simulations (IREMOS), 5 (1), pp. 473-476.
Y. Li and N. Sollenberger, Adaptive antenna arrays for OFDM systems with co-channel interference, IEEE Trans. Commun., Volume 47, February 1999, Pages 217-229.
Ye (Geoffrey) Li and N. Seshadri, Channel estimation for OFDM systems with transmitter diversity in mobile wireless channels, IEEE J. Select. Areas Comm., Volume 17, March 1999, Pages 461-471.
Ye (Geoffrey) Li, Simplified channel estimation for OFDM systems with multiple transmit antennas, IEEE trans. Wireless Commun., Volume 1, (Issue 1), January 2002, Pages 67-75.
H. Minn, D.I. Kim and V.K. Bhargava, A reduced complexity channel estimation for OFDM systems with transmit diversity in mobile wireless channels, IEEE Trans. Commun., Volume 50, (Issue 5), May 2002, Pages 799-807.
A. Aghamohammadi, H. Meyr, and G. Ascheid, A new method for phase synchronization and automatic gain control of linearly modulated signals on frequency-flat fading channels, IEEE Trans. Commun., Volume COM-39, January 1991, Pages 25-29.
J. K. Cavers, An analysis of pilot symbol assisted modulation for Rayleigh fading channels, IEEE Trans. Veh. Technol., Volume 40, November 1991, Pages 686-693.
P. Hoeher, S. Kaiser, and P. Robertson, Two-Dimensional pilot-symbol-aided channel estimation by Wiener filtering, 1997 IEEE Int. Conf. Acoustics, Speech, and Signal Processing, Vol. 3, pp. 1845-1848, Munich, Germany, April, 1997.
Ye (Geoffrey) Li, Pilot-symbol-aided channel estimation for OFDM in wireless systems, IEEE Trans. Veh. Technol., Volume 49, July 2000, Pages 1207-1215.
S. A. Alkhawaldeh, Wideband channel estimation for full rate full diversity antenna selection wireless systems, Journal of Applied Sciences, Volume 12, 2012, Pages 1378-1383.
H. Y. Chen, M. L. Ku, S. J. Jou and C. C. Huang, A robust channel estimator for high-mobility STBC_OFDM systems, IEEE Trans. Circuits and systems I, Volume 57, 2010, Pages 925-936.
F. Delestre and Y. Sun, A channel estimation method for MIMO-OFDM mobile wimax systems, IEEE ISWCS, pp. 956-960, 2010.
Agboje, O., Idowu-Bismark, O., Ibhaze, A., Comparative Analysis of Fast Fourier Transform and Discrete Wavelet Transform Based MIMO-OFDM, (2017) International Journal on Communications Antenna and Propagation (IRECAP), 7 (2), pp. 168-175.
Al Jawabrh, H., Samarah, K., Hybrid Peak to Average Power Ratio Reduction Technique in QPSK-Based Orthogonal Frequency Division Multiplexing Systems, (2017) International Journal on Communications Antenna and Propagation (IRECAP), 7 (5), pp. 457-466.
V. D. Beek, J.J., O. Edfors, M. Sandell, S. K. Wilson and P. O. Borjesson, On channel estimation in OFDM systems, 45th IEEE Vehicular Technology Conf., Vol. 2, pp. 815-819, 1995.
Li, Y., L.J. Cimini and N.R. Sollenberger, Robust channel estimation for OFDM systems with rapid dispersive fading channel, IEEE Trans. Commun., Volume 46, 1998, Pages 902-915.
Sivanagaraju, V., Siddaiah, P., A Robust Hybrid NDA Estimation Technique for SNR Estimation in OFDM System, (2015) International Journal on Communications Antenna and Propagation (IRECAP), 5 (2), pp. 63-69.
Recommendation ITU-R M.1225, Guidelines for evaluation of radio transmission technologies for IMT-2000, 1997.
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