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In this paper, enhanced OSIC (ordered successive interference cancellation) algorithm combined with ML (maximum likelihood) is considered for double TxAA (transmit antenna array) MIMO (multi-input multi-output) system. Error propagation is known to be inherent drawback of OSIC algorithm and deteriorate system performance significantly. Its performance is seriously affected, in particular, by the last...
Random unitary beamforming (RUB) is an attractive low-complexity transmission scheme for multiuser MIMO broadcast channel. When there are a moderate number of users in the system, the sum rate performance of this signaling scheme becomes mainly interference-limited over high signal-to-noise ratio (SNR) region. In this paper, we study the performance of RUB-based multiuser MIMO systems when optimum...
In this paper, we consider a class of wireless ad hoc networks, namely two-hop MIMO interference relay network, where L M-antenna source-destination pairs communicate via K relay nodes each equipped with N antennas. Based on recent advances on characterizing the limits of MIMO X channel and the concept of interference alignment, we treat this network as the cascade of two MIMO X networks and decompose...
Multi-input multi-output (MIMO) antenna systems provide the user with additional degrees of freedom over traditional single antenna (SISO) system to enable optimum transmission. This paper focuses on the use of multi-antenna techniques to compensate for in-band interference in scatter rich environments.We consider the effects of narrowband interference in a collection of typical channels with delay...
In this paper we present the mutual information of a bit-interleaved V-BLAST space-time architecture. We assume interference cancellation by successive detection using MMSE equalizers without decoding of the channel codes. The mutual information is dependent on the MIMO channel realization and the detection order. However, the mutual information is very similar to that of an AWGN channel when plotted...
In an OFDM system, known symbols referred to as pilot are transmitted across the time-frequency plane for the receiving device to estimate the channelpsilas time-frequency response in order to perform coherent demodulation of data symbols. The placement of these pilot symbols largely falls into two categories, namely, the regular and irregular patterns. Inspired by synchronization techniques used...
User-specific, linear precoding is used extensively by almost all existing and emerging wireless MIMO standards [1], [2], [3], [4]. With user-specific, linear precoding, the data symbols to be transmitted to each user are passed through a linear transformation before being sent to the transmit antennas, and a different precoder is used for each user depending on his/her channel. For example, with...
The purpose of this paper is to report on an unsuitable behavior of the constrained stochastic gradient (CSG) algorithm for adaptive beamforming in the combination of two events: one or more interference angles-of-arrival are close to the signal angle-of-arrival and the angle spreads of the involved signals are small. In this situation, the CSG algorithm stresses the co-channel interference minimization...
In this paper, we focus on adaptive beamforming applied to a geostationary satellite system working in the Ka-band. Given a user of interest, all users of the system using the same frequency appear as jammers. Unknown sources might also interfere with the system. Adaptive beamforming provides the system with the suppression of interferences. Given the high number of sensors, computational load must...
Over the years, adaptive antenna arrays have received significant research efforts because of their ability to automatically null interference signals while maintaining a high signal-to-interference plus noise ratio (SINR) in the direction of the signal of interest (SOI). The research efforts have not only focused on developing new weighting algorithms, but also on understanding how the individual...
A robust adaptive beamformer with new constraints on the array response is proposed to avoid signal cancellation in the environment where multi-path signals exist. The robustness is achieved by forcing the magnitude response of the desired signal and its multi-path signals exceeding unity in the presumed clusters while minimizing the output power. In this way, the desired signal is conbined with its...
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