Traditional power control with beamforming achieves a targeted Signal-to-Interference-Noise-Ratio (SINR) in wireless networks assuming measurement of SINR and direction of arrival (DOA) at the receivers. Blind beamforming is an emerging technique for DOA measurement without consuming extra bandwidth. Here we propose a joint power control and blind beamforming algorithm that reformulates the pow...

We are interested in the task of speech beamforming in conference room meetings, with microphones built in the electronic devices brought and casually placed by meeting participants. This task is challenging because of the inaccuracy in position and interference calibration due to random microphone configuration, variance of microphone quality, reverberation etc. As a result, not many beamformi...

Beamforming is a signal processing technique. It has been studied in many areas such as radar, sonar, seismology and wireless communications, to name but a few. It can be used for a myriad of purposes, such as detecting the presence of a signal, estimating the direction of arrival, and enhancing a desired signal from its measurements corrupted by noise, competing sources and reverberation. Actu...

In this letter, we address a strategy to enhance the signalto-interference plus noise ratio (SINR) of the worst-case user by using cooperative transmission from a set of geographically separated antennas. Unlike previously reported schemes which are based on either the power control of individual antennas or cooperative orthogonal transmission, the presented strategy utilizes the minimum-mean-s...

We investigate the different usage of multiple transmit antennas in a SDMA/TDMA single-cell downlink system under random packet arrivals, correlated block-fading channels and non-perfect channel state information at the transmitter due to a feedback delay. We derive the arrival rate stability region and the adaptive scheduling policy that stabilizes any arrival rate point inside the region with...

Recent work has highlighted the potential benefits of exploiting ellipsoidal uncertainty set based robust Capon beamformer (RCB) techniques in passive sonar. Regrettably, the computational complexity of forming RCB weights is cubic in the number of adaptive degrees of freedom, which is often prohibitive in practice. For this reason, several low-complexity techniques for computing RCB weights, o...

We propose a new algorithm for blind source separation (BSS), in which independent component analysis (ICA) and beamforming are combined to resolve the low-convergence problem through optimization in ICA. The proposed method consists of the following three parts: (1) frequency-domain ICA with direction-of-arrival (DOA) estimation, (2) null beamforming based on the estimated DOA, and (3) integra...

Beamforming needs to have the channel state information (CSI) at the transmitter. The CSI is measured at the receiver and is fed back to the transmitter in the quantized form. Quantized CSI affects the BER performance. Casting the problem of quantization as a vector quantization (VQ) problem, we try to quantize the channel information in such a way as to minimize the loss in the performance due...

The term smart antenna incorporates all situations in which a system is using an antenna array and the antenna pattern is dynamically adjusted by the system required.Two major issues in smart antennas are Direciton of Arrival (DOA) estimation and beamforming. The Direction of Arrival of all the incoming signals including the interfering signals are estimated using DOA algorithms.Some of the DOA...

A signal interpolation technique based on the Hilbert transform of a signal is proposed. This technique can be efficiently used for fractional time delay estimation. A useful application of the technique is demonstrated using examples of digital beamforming with wideband signals. Conventional wideband signal beamforming is computationally intensive due to the calculation of fractional time dela...