An Overlap-Cut Frequency Domain Equalizer with Decision Feedback

In this paper, we propose a Frequency Domain Equalizer (FDE) without inserting the Guard Interval (GI) at the transmitter which is applicable to the Wide-band Code Division Multiple Access (WCDMA) and Orthogonal Frequency-Division Multiplexing (OFDM) systems. The proposed FDE adopts the Overlap-Cut (OC) method to avoid the Inter-Block Interference (IBI) and exploits the decision feedback structure to improve the Bit Error Rate (BER) performance. Without inserting the GI, the proposed FDE will be compatible to the frame format of the current High Speed Downlink Packet Access (HSDPA). Besides, it can improve the BER performance and bandwidth utilization when the GI is less than the channel length of the OFDM system.

[1]  F. Laue,et al.  The performance of deterministic Rayleigh fading channel simulators with respect to the bit error probability , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[2]  Michael D. Zoltowski,et al.  Conjugate gradient based MMSE equalization for DS-CDMA forward link in time-varying frequency selective channels , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[3]  Nevio Benvenuto,et al.  Frequency-domain interference cancellation and nonlinear equalization for CDMA systems , 2005, IEEE Transactions on Wireless Communications.

[4]  Friedrich K. Jondral,et al.  Low complexity CDMA downlink receiver based on frequency domain equalization , 2003, 2003 IEEE 58th Vehicular Technology Conference. VTC 2003-Fall (IEEE Cat. No.03CH37484).

[5]  Fumiyuki Adachi,et al.  Overlap MMSE-Frequency-domain Equalization for Multi-carrier Signal Transmissions , 2006 .

[6]  G. Mandyam,et al.  Efficient linear equalization for high data rate downlink CDMA signaling , 2003, The Thrity-Seventh Asilomar Conference on Signals, Systems & Computers, 2003.

[7]  Fumiyuki Adachi,et al.  Iterative Overlap FDE for Multicode DS-CDMA , 2008, IEICE Trans. Commun..

[8]  Asrar U. H. Sheikh,et al.  Decision feedback equalization for CDMA in indoor wireless communications , 1994, IEEE J. Sel. Areas Commun..