In this paper, we address the problem of OFDM transmission over a time-varying, frequency-selective channel with high Doppler spread. This creates situations where the channel significantly evolves over the time span of one OFDM symbol. We analyze the CP-OFDM transmission mechanism, and the impairments due to the channel variations, using a decomposition of these variations over a base of sinus...

Single-carrier transmission is one of the most potential options for uplink transmission in wide-area deployments. It combines the benefits of computationally simple transmitter processing and highly efficient power amplification at the terminal. Frequency-domain methods for efficient equalization can be utilized at the access point either in linear MMSE equalization or in iterative turbo equal...

Recently, overlap frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion which requires no guard interval (GI) insertion was proposed for signal transmission using multi-code direct sequence code division multiple access (DS-CDMA) in a frequency-selective fading channel. Another promising equalization technique is time-domain sliding-window chip equalization (SW...

In recent years, the ambition to achieve very high data rates in wireless communication systems has fuelled the study of multiple-input multiple-output (MIMO) architectures and has resulted in the need for more advanced equalization techniques. Currently, the wireless industry is at a point where typical time-domain equalization solutions are becoming too complex to implement in MIMO systems. I...

Abstract Recently, multi-carrier code division multiple access (MC-CDMA) has been attracting much attention for the broadband wireless access in the next generation mobile communications systems. In the case of uplink transmissions, the orthogonality among users’ signals is destroyed since each user’s signal goes through different fading channel and hence, the use of frequency-domain pre-equali...

In a frequency-selective fading channel, the transmission performance of single-carrier (SC) transmission significantly degrades due to severe inter-symbol-interference (ISI). In this paper, the joint use of space-time transmit diversity (STTD), receive antenna diversity and frequency-domain minimum mean square error (MMSE) equalization in SC transmission is studied. Space-time encoding and dec...

This paper proposes low-complexity preand postfrequency domain equalization and frequency diversity combining methods for block transmission schemes with cyclic prefix. In the proposed methods, the equalization and diversity combining are performed simultaneously in discrete frequency domain. The weights for the proposed equalizer and combiner are derived based on zero-forcing and minimummean-s...

Orthogonal frequency division multiplexing (OFDM) is a suitable candidate for broadband power line communications (PLC). It has shown that the Bit Error Rate (BER) performance of Single Carrier Transmission with Frequency Domain Equalization (SCT-FDE) is close to OFDM in broadband wireless systems. In this paper we investigate the BER performance of SCT employing time and frequency domain decis...

Abstract As the number of resolvable paths increases, the bit error rate (BER) performance of DS-CDMA with Rake combining degrades due to increasing inter-path interference. However, using the frequency domain equalization can improve the BER performance. For frequency-domain equalization, estimation of the channel transfer function is required. In this paper, we propose the iterative channel e...