Broadband Beamforming
نویسنده
چکیده
Broadband wireless channels, where high data rates are transmitted, are extremely dispersive in nature. A fundamental challenge in the design of equalizers for the broadband case lies in reducing complexity. Broadband finite impulse response (FIR) beamformers employ a space-time antenna array which reduces the multipath delay spread to narrowband levels. The beamformers should additionally preserve the whiteness of the channel noise at the beamformer output to allow for the application of trellis based equalizers. The power complementarity property has been used to address this issue in the literature. Techniques to design FIR filters that preserve the whiteness of the channel noise when the received signal is oversampled are studied in this project.
منابع مشابه
Fixed and Mobile Broadband Wireless Access Networks Employing Optically Beam-formed Antennas
Broadband wireless access networks that operate in the millimetre-wave frequency band are envisaged to fulfil the bandwidth requirements of broadband multimedia services. At these frequencies, temporary obstacles and adverse meteorological conditions may drastically impair on the system performance by intercepting the required line-of-sight radio wave propagation, which results in degrading the...
متن کاملBeamforming in combination with space-time diversity for broadband OFDM systems
In this paper, we investigate broadband OFDM systems which apply beamforming in combination with different space–time diversity techniques. Various beamforming scenarios with transmitter and/or receiver sided beamforming are considered. Space–time diversity is obtained by cyclic delay diversity (CDD) in order to artificially shape the spectrum of the received signal. Thus, an advantageous distr...
متن کاملExploring Spatial Diversity Techniques for Future Broadband Multicarrier Mobile Radio Systems
In this paper, we investigate broadband OFDM systems which apply beamforming in combination with different space–time diversity techniques. Various beamforming scenarios with transmitter and/or receiver sided beamforming are considered. Space–time diversity is obtained by cyclic delay diversity (CDD) in order to artificially shape the spectrum of the received signal. Thus, an advantageous distr...
متن کاملAn adaptive algorithm for broadband frequency invariant beamforming
Frequency invariant beamforming is array processing in which the spatial response remains constant (with respect to frequency) within a wide frequency band of interest. In this paper we present a new algorithm for adaptive broadband beamforming which solves a minimum variance beamforming problem, with a structural frequency invariant beampattern constraint. This constraint allows us to reduce t...
متن کاملNovel Photonic Integrated Beamforming Architectures for Adaptive Broadband Wireless Access Networks in the mm-wave band
In this paper, several optical beamforming architectures are proposed and experimentally demonstrated. The progress achieved for realizing these architectures with integrated optics is also reported. Due to its advanced features (fast-switching, huge bandwidth, immunity to EMI) the proposed photonic integrated beamforming architectures are a very promising alternative to traditional beamforming...
متن کاملBroadband Active Sonar: Implications and Constraints
The broadband sonar concept has an impact on all areas of an active sonar system. This includes the signal processing of transmit-receive signals, the response of the medium and the target response. Beginning with the definition of a broadband signal, the implications of broadband signal processing in terms of matched filtering, pulse compression, low probability of interception and beamforming...
متن کامل