Iterative Interference Cancellation for STBC-OFDM Systems in Fast Fading Channels

Abstract

The performance of a space-time block coded orthogonal frequency-division multiplexing (STBC-OFDM) system often relies on the assumption of quasi-static channels. For the time-varying multipath channel, co-channel interference (CCI) and inter-carrier interference (ICI) occur and performance degrades seriously. In this paper, we propose an iterative interference cancellation scheme to reduce both CCI and ICI jointly. In particular, a list successive interference cancellation (List-SIC) algorithm is presented to obtain a candidate list to obtain soft information used in the CCI cancellation. Furthermore, an ICI cancellation algorithm that uses prior List-SIC information from the preceding iteration is proposed. The simulation results show that the proposed scheme achieves near maximum likelihood (ML) error performance within only two or three iterations in fast fading channels.

Frequency-Domain Equalization for Single-Carrier Space-Time Block Coded Transmit Diversity in a High Mobility Environment

“…We show by computer simulation that the proposed robust FDE can tolerate higher Doppler frequency than the conventional FDE [9] in FD-STTD transmission. Then we show that the proposed robust FDE achieves almost the same BER performance as I 2 C [11], [12] with lower computational complexity.…”

“…Using the knowledge of CSI, I 2 C can be applied. Figure 5 compares the BER performance of FD-STTD when using the proposed robust FDE and that when using the conventional FDE with I 2 C [11], [12]. The number of transmit and receive antennas are set to N t = N r = 2.…”

“…However, in a high mobility environment, the STBC codeword orthogonality tends to be distorted and as consequence, the BER performance is severely degraded due to the orthogonality distortion of STBC codeword (below, we refer to it as STBC codeword interference) [10]. Iterative interference cancellation (I 2 C) was proposed to mitigate the orthogonality distortion [11], [12]. However, I 2 C requires high computational complexity at the receiver.…”

Row approximation calculation method of SER in high speed mobile STBC-OFDM system

“…A successive interference cancellation (SIC) technique has been reported in the literature [1], which can improve the performance of the STBC-OFDM. The works in the literature [2] [3] have proposed different ICI cancellation schemes by reduce both CCI (cochannel interference) and ICI. A fast iterative ICI cancellation scheme proposed in the work [4] can effectively improve the system performance, besides which, this scheme uses the SIR to measure the performance of STBC-OFDM system.…”