In this paper, fast algorithms for the CMA (constant modulus algorithm), which is one of the widely used algorithms for blind equalizationi are presented. We propose the FBCMA (frequency domain block CMA) which takes advantage of fast linear convolution in the DFT domain by using the overlap save method. For the FBCMA, a nonlinear error function in the frequency domain is derived using Parseval...

In this paper, a wavelet transform domain realization of the blind equalization technique termed as EVA is applied to speech analysis. The conventional linear prediction problem can be viewed as a constrained blind equalization problem. Because the EVA does not impose any restriction to the probability distribution in the input (the glottal excitation), the principal features of speech can be e...

In this paper, we describe a novel type of cyclic prefix assisted single carrier CDMA system with Frequency Domain Equalization (FDE) and MIMO Multiplexing. The proposed method is referred to as MIMO SC/FDE CDMA. Multipath Interference can be mitigated by inserting cyclic prefix at the transmitter. Furthermore, we use different scrambling codes to separate different transmit antennas. At the re...

Abstract Recent research has indicated that single carrier frequency domain equalization (SC-FDE) is an attractive technology for underwater acoustic communications. Because it does not have the drawbacks of OFDM systems such as large peak-to-average ratio and the sensitivity to carrier frequency offsets. In this paper, three kinds of frequency domain equalization schemes were compared in the u...

Abstract—The performance of the single-carrier (SC) transmission in a frequency-selective fading channel degrades due to a severe inter-symbol interference (ISI). By using frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion at a receiver, the bit error rate (BER) performance of the SC transmission can be significantly improved. Recently, Tomlinson-Harashi...

Frequency-domain equalization used in MC-CDMA can be applied to the reception of DS-CDMA signals. Further performance improvement can be attained by the additional use of multiple transmit/receive antenna diversity. The BER performance improvement attainable by the joint use of frequency-domain equalization and multiple transmit/receive antenna diversity in a frequency-selective fading channel ...

In this work the performance of different receivers for single-carrier frequency division multiple access (SC-FDMA) transmission over frequency-selective fading channels is investigated. The receiver design is done for a single-user multiple-input multiple-output (MIMO) system. Linear equalization in frequency domain according to the minimum mean-squared error (MMSE) criterion is compared to jo...

Orthogonal frequency division multiplexing (OFDM) combined with time division multiplexing (TDM), called OFDM/TDM, can overcome the high peak-to-average-power ratio (PAPR) problem of the conventional OFDM. Its bit error rate (BER) performance in a frequency-selective fading channel is improved by adoption of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion...

Abstract The downlink bit error rate (BER) performances of DSand MC-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion. However, the uplink BER performance degrades due to strong multi-user interference (MUI) since different users’ signals go through different channels a...

Single-carrier cyclic prefix (SCCP) has been proposed as an alternative to orthogonal frequency division multiplexing (OFDM). While the implementation complexity of the two schemes are comparable, SCCP avoids the peak-to-average power ratio problem that plagues OFDM. Both OFDM and SCCP receivers leverage the fast Fourier transform for computationallyefficient frequency-domain equalization. For ...