Channel estimation is an essential part of many detection techniques proposed for data transmission over fading channels. For the frequency selective Rayleigh fading channel an autoregressive moving average representation is proposed based on the fading model parameters. The parameters of this representation are determined based on the fading channel characteristics, making it possible to emplo...

This paper evaluated t h e performance of a noncoherent parallel matched-filter acquisition scheme with a reference filter ( R F ) for a direct-sequence/spread-spectrum multiple access (DS/SSMA) sys tem in a frequency-selective fading channel. Mean acquisition t ime for t h e paralleI MFR F acquisition scheme is derived for a frequency-selective Rayleigh fading channel. This acquisition scheme ...

Multiple-input multiple-output (MIMO) wireless communication system exploits the multiple spatial channels to achieve higher data rate or improved performance in multipath fading environment. Different types of diversity techniques such as temporal, frequency, code and spatial have been developed in the literature. In addition to the destructive multipath nature of wireless channels, frequency ...

In this paper, an accurate and computationally efficient algorithm is proposed for estimating time-varying and frequency-selective fading channel with unequally spaced pilot symbols. By employing the time-varying coefficient polynomial interpolation method, it is proved that the time-varying channel impulse response can be estimated by the product of a constant interpolation matrix and the fadi...

This paper describes a blind algorithm for estimating a time varying and frequency selective fading channel. In order to identify blindly the impulse response of these channels, we have used Higher Order Statistics (HOS) to build our algorithm. In this paper, we have selected two theoretical frequency selective channels as the Proakis’s ‘B’ channel and the Macchi’s channel, and one practical fr...

ADAPTIVE DS-CDMA MULTIUSER DETECTION FOR TIME VARIANT FREQUENCY SELECTIVE RAYLEIGH FADING CHANNEL

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using ...

An adaptive receiver is presented in this paper for the reception of linearly modulated signals transmitted over a timeand frequency-selective fading channel. The channel is modeled as a truncated power series [1] which represents the dispersive fading channel as a sum of three elementary flatfading channels. The proposed receiver consists of a sequence estimator with a parallel channel estimat...

Time synchronization of continuous phase modulation (CPM) signals over time selective, Rayleigh fading channels is considered. The Cramér–Rao lower bound (CRLB) for this problem is studied for data-aided (DA) synchronization (i.e., known symbol sequence transmission) over a time-selective Rayleigh fading (i.e., Gaussian multiplicative noise) channel. Exact expressions for the bound are derived ...