An overview is given on the fundamental problems when combining acoustic echo cancellation (AEC) with adaptive beamforming microphone array (ABMA) in fullduplex communications. For reasons of computational complexity and functionality, a compromise is necessary between one echo canceller per microphone signal and a single echo canceller for the beamforming output. Here, the decomposition of the...

Based on the two-microphone approach, the applications are characterized as three methods, which are based on identification of unknown system in acoustic channels, adaptive speech beamforming and adaptive noise cancellation. It can be described as generalized three sub-block diagram as shown in Fig. 2, where it is shown as three processing stages of (1) kepstrum (complex cepstrum), (2) beamfor...

Transmit beamforming is a versatile technique for signal transmission from an array of N antennas to one or multiple users [1]. In wireless communications, the goal is to increase the signal power at the intended user and reduce interference to non-intended users. A high signal power is achieved by transmitting the same data signal from all antennas, but with different amplitudes and phases, su...

A wireless network using high altitude platforms located in the stratosphere is attracting interests as a new network infrastructure. This paper provides the design concept and basic performance of the prototype of onboard digital beamforming (DBF) antenna in Ka band, which achieves quick-response and robust space division multiple access (SDMA) schemes. The configuration of the prototype DBF a...

Spatial processing with adaptive antenna array has shown real promise for substantial capacity enhancement in wireless communications. We propose a novel beamforming technique based on the minimum bit error rate (MBER) criterion. It is demonstrated that the MBER approach utilizes the system resource, the antenna elements, more intelligently than the standard minimum mean square error (MMSE) app...

We investigate the generalized receiver (GR) constructed based on the generalized approach to signal processing in noise employing non-blind beamforming algorithms and direction of arrival (DOA) estimation, which is implemented by multiple-input multiple-output (MIMO) wireless communication systems. We compare three non-blind beamforming algorithms, namely, the least mean square (LMS), the recu...

Modern wireless communications systems require improvement in capacity and data transmission speed. Adaptive array antennas separate spatially a desired wave from interference waves by controlling their radiation or beam pattern directivity. A digital beamforming (DBF) array performs adaptive beamforming by digital signal processing. However, the circuit scale, number of RF channels and power c...

Energy Efficient Wireless Communication using Distributed Beamforming by Raghuraman Mudumbai We consider the use of distributed beamforming to improve the energy efficiency and transmission range of wireless networks. Under distributed beamforming, a number of wireless transmitters collaboratively transmit a common message signal in such way that their individual transmissions combine coherentl...

OBJECTIVE To evaluate monaural beamforming in bimodally aided cochlear implant (CI) users. DESIGN The study enrolled twelve adult bimodal listeners with at least six months of CI-experience and using a contralateral hearing aid (HA) most of the daytime. Participants were uniformly fitted with the same CI speech processor and HA, giving access to an identical monaural beamformer in both ears. ...