ICI Canceling Space-Frequency Block Code for MISO-OFDM in Fast Fading Channels

Abstract

Abstract-An intercarrier interference (ICI) canceling technique for multiple-input single-output (MISO) orthogonal frequency division multiplexing (OFDM) systems in fast fading channels is proposed. The proposed scheme consists of a linear space-frequency block code (SFBC) at the transmitter and a receive frequency block code (RFBC) at the receiver. The code design is based on the upper bound of pairwise error probability (PEP) which is derived under assumptions and approximations stated. Specifically, the proposed code is designed to minimize the upper bound of the PEP. The simulation results demonstrate that the proposed technique outperforms the conventional methods in fast fading environments. I. INTRODUCTIONOrthogonal frequency division multiplexing (OFDM) is a promising technique for broadband communication systems since it converts a frequency-selective broadband channel into a series of parallel narrowband channels. Therefore, the OFDM can reduce the equalization and decoding complexity [1], [2]. In fact, many modern communication standards for high data rates adopt the OFDM as a transmission technique [3]- [5]. However, it has been recognized that the performance of the OFDM can be severely degraded if the channel varies significantly within an OFDM symbol period [6]. This degradation is due to the intercarrier interference (ICI). To compensate for the ICI, various techniques have been introduced for single-input single-output (SISO) systems, including the frequency-and time-domain equalizations (see [7] and references therein), the ICI self-cancelation [8]- [11], and the frequency-domain partial response coding (PRC) [12], [13]. Among those approaches, the equalizations are the most common, but implementation requires heavy computations. The ICI self-cancelation schemes are based on the use of a frequency-domain coding or a time-domain windowing, which has a code rate of 1/k. This method can cancel the ICI effectively with a small computational complexity at the receiver;

Performance analysis of a MIMO-OFDM wireless communication system with convolutional coding

“…Reference [4] proposed a simple method, that is , an approximation closed-form equation of the bit error rate (BER) in DPSK/OFDM systems mentioned above over both time and frequency selective Rician fading channels. Reference [5] shows the impact of ICI Cancelling Space-Frequency Block Code for MISO-OFDM over the Fast Fading Channels. Performance evaluation of a multiantenna OFDM systems in fading channels with additive transmitter and receiver impairments has been carried out in Reference [6].…”