We consider the problem of estimating the gains and phases of the RF channels of a M-element transmitting array, based on a calibration procedure where M orthogonal signals are sent through M orthogonal beams and received on a single antenna. The received data vector obeys a linear model of the type y 1⁄4 AFg þ n where A is an unknown complex scalar accounting for propagation loss and g is the ...

Single-microphone noise reduction leads to subjective benefit, but not to objective improvements in speech intelligibility. We investigated whether response times (RTs) provide an objective measure of the benefit of noise reduction and whether the effect of noise reduction is reflected in rated listening effort. Twelve normal-hearing participants listened to digit triplets that were either unpr...

Interpolation of signals (arbitrary dimension, here: 2D images) with missing data points is addressed from a statistical point of view. We present a general framework for which a Wiener-style MMSE estimator can be seamlessly adapted to deal with problems such as image interpolation (inpainting), reconstruction from sparse samples, and image extrapolation. The proposed method gives a precise ans...

Orthogonal frequency division multiplexing (OFDM) communication systems encounter performance limitations due to time-varying channels common in wireless applications. The channel variations introduce intercarrier interference (ICI) in the received signal. To compensate, groups of adjacent OFDM carriers can be processed to cancel the interference. This paper considers a two-stage ICI cancellati...

The problem of color constancy may be solved if we can recover the physical properties of illuminants and surfaces from photosensor responses. We consider this problem within the framework of Bayesian decision theory. First, we model the relation among illuminants, surfaces, and photosensor responses. Second, we construct prior distributions that describe the probability that particular illumin...

In this paper, we propose a novel sparse signal recovery algorithm called Trainable ISTA (TISTA). The proposed algorithm consists of two estimation units such as a linear estimation unit and a minimum mean squared error (MMSE) estimator-based shrinkage unit. The estimated error variance required in the MMSE shrinkage unit is precisely estimated from a tentative estimate of the original signal. ...

Receivers require channel state information (CSI) to be able to detect the transmitted information. Therefore the channel has to be estimated. This imperfect channel knowledge results in an extra noise term at the receiver side. In this paper, the influence of a Gaussian channel estimation error on the performance of a linear Minimum Mean Squared Error (MMSE) Finite Impulse Response (FIR) equal...

Although numerous channel estimation and multiuser detection approaches have appeared for long-code uplink CDMA systems, joint performance study of channel estimators and symbol detectors remains largely open. In this paper, we construct three typical symbol-level linear receivers upon existing channel estimationmethod, known as zero-forcing (ZF), minimummean-square-error (MMSE), and RAKE recei...

This paper, addresses the issue of channel phaser estimation in WCDMA, in which both the Common Pilot Channel (CPICH), which is not power controlled, and the Dedicated Physical Control Channel (DPCCH), having pilot symbols with power control, are available. Depending on the user’s location, either the CPICH or DPCCH may have better SINR and hence, yield more reliable channel estimates. The prop...

A new orthogonal multicarrier bandwidth modulation (OMBM) scheme is proposed in this paper. The distinct feature of this scheme is that the frequency domain data is used to decide the number of orthogonal subcarriers for wireless transmissions. Different bandwidth of the OMBM symbol in the time domain reflects on the different data in the frequency domain. A Discrete Fourier Transform (DFT) bas...