This paper presents an overview of adaptive equalization used in multiple-input-multiple-output (MIMO) wireless systems. In this paper, we consider two-user transmission over a Rayleigh frequency selective fading channel, in which the Channel State Information (CSI) is known by the receiver. Subject to an average transmit power constraint, we study the performance with Rayleigh fading. Besides ...

Joint mitigation of timeand frequency-selective fading is an important and challenging problem in mobile communications. Relying on transmitter-induced redundancy, we propose novel channel estimation and symbol recovery approaches for blind identification and equalization of timeand frequency-selective channels, where the time variation is modeled deterministically by a basis expansion. The res...

This paper addresses the problem of channel equalization and tracking in turbo coded signals over frequency selective fading and delay spread channels. An innovative turbo equalization structure is presented jointly with the iterative decoding process, which is based on performing channel equalization via double decision feedback equalizer (DDFE) designed by using noncomplex least mean square a...

This paper considers block transmissions over single-antenna doubly selective channels that obey a complexexponential basis expansion model. We consider the noncoherent case, when the channel fading coefficients are not known at both transmitter and receiver. We characterize the spectral efficiency of the channel when the inputs are chosen from continuous distributions. Then, we study several p...

In this paper, the bit error rate (BER) of 16 differential amplitude phase shift keying (16DAPSK) modems in future mobile communication system is derived analytically. The channel employed in this paper is the frequency-selective and fast Rayleigh fading channel, corrupted by cochannel interference (CCI) and additive white Gaussian noise (AWGN). Exact expressions for the probability distributio...

In downlink MC-CDMA, orthogonal variable spreading factor (OVSF) codes can be used to allow multirate communications while maintaining the orthogonality among the users with different data rates. In this paper, we point out that simple selection of the OVSF codes results in degraded performance. We show that this happens because simple code selection results in power concentration over certain ...

The use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can significantly improve the downlink bit error rate (BER) performances of DSand MCCDMA in a frequency-selective fading channel. However, the uplink BER performance degrades due to a strong multi-user interference (MUI). In this paper, we propose frequency-interleaved spread spectrum (SS) using M...

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract – In wireless communication, multipath propagation results in several fading effect. To equalize such long fading channel traditional single carrier time domain equalization becomes infeasible due to its large computational complexity. Single-carri...

Estimating a channel that is subject to frequency selective Rayleigh fading is a challenging problem in an orthogonal frequency division multiplexing (OFDM) system. We propose an EM-based iterative algorithm to efficiently estimate the channel impulse response (CIR) of an OFDM system. This algorithm is capable of improving the channel estimate by making use of pilot tones to obtain the initial ...

When perfect channel state information (CSI) is available at a receiver, the maximum Doppler diversity gains from frequency flat time selective (FFTS) fading channels can be achieved with a pair of judiciously designed precoding and grouping scheme. When CSI is not available at the receiver, modelling FFTS fading channels with basis expansion models (BEM) enables channel estimation without know...