Pilot-Assisted Channel Estimation for Orthogonal Multi-Carrier DS-CDMA with Frequency-Domain Equalization

Orthogonal multi-carrier direct sequence code division multiple access (orthogonal MC DS-CDMA) is a combination of time-domain spreading and orthogonal frequency division multiplexing (OFDM). In orthogonal MC DS-CDMA, the frequency diversity gain can be obtained by applying frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion to a block of OFDM symbols and can improve the bit error rate (BER) performance in a severe frequency-selective fading channel. FDE requires an accurate estimate of the channel gain. The channel gain can be estimated by removing the pilot modulation in the frequency domain. In this paper, we propose a pilot-assisted channel estimation suitable for orthogonal MC DS-CDMA with FDE and evaluate, by computer simulation, the BER performance in a frequency-selective Rayleigh fading channel.

[1]  Robert L. Frank,et al.  Polyphase codes with good nonperiodic correlation properties , 1963, IEEE Trans. Inf. Theory.

[2]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[3]  Fumiyuki Adachi,et al.  Broadband CDMA techniques , 2005, IEEE Wireless Communications.

[4]  Ye Li.  Pilot-symbol-aided channel estimation for OFDM in wireless systems , 2000, IEEE Trans. Veh. Technol..

[5]  Fumiyuki Adachi,et al.  Multi-Carrier DS-CDMA Transmission with Frequency-domain Equalization , 2007, 2007 IEEE Wireless Communications and Networking Conference.

[6]  J.E. Mazo,et al.  Digital communications , 1985, Proceedings of the IEEE.

[7]  Fumiyuki Adachi,et al.  Pilot-Assisted Decision Feedback Channel Estimation for STTD in OFDM Mobile Radio , 2005, IEICE Trans. Commun..

[8]  D. Owen.  Handbook of Mathematical Functions with Formulas , 1965 .

[9]  Fumiyuki Adachi,et al.  Pilot-aided adaptive prediction channel estimation in a frequency-nonselective fading channel , 2002 .

[10]  S.K. Wilson,et al.  On channel estimation in OFDM systems , 1995, 1995 IEEE 45th Vehicular Technology Conference. Countdown to the Wireless Twenty-First Century.

[11]  M. Sandell,et al.  Low-complex frame synchronization in OFDM systems , 1995, Proceedings of ICUPC '95 - 4th IEEE International Conference on Universal Personal Communications.

[12]  Laurence B. Milstein,et al.  Performance of multicarrier DS CDMA systems , 1996, IEEE Trans. Commun..

[13]  E-L. Kuan,et al.  Overview of Multicarrier CDMA , 2004 .

[14]  David C. Chu,et al.  Polyphase codes with good periodic correlation properties (Corresp.) , 1972, IEEE Trans. Inf. Theory.

[15]  Fumiyuki Adachi,et al.  Frequency-Domain MMSE Channel Estimation for Frequency-Domain Equalization of DS-CDMA Signals , 2007, IEICE Trans. Commun..

[16]  Ramjee Prasad,et al.  Design and performance of multicarrier CDMA system in frequency-selective Rayleigh fading channels , 1999 .

[17]  Fumiyuki Adachi,et al.  Bit Error Rate Analysis of OFDM with Pilot-Assisted Channel Estimation , 2007, IEICE Trans. Commun..