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We present a coherent single-carrier system with optimized channel estimation and low-complexity fractionally-spaced frequency-domain equalizer. The concept is experimentally demonstrated for QPSK and 16-QAM systems to enable substantial overhead and complexity reduction without performance degradation.
We experimentally demonstrate coherent polarization-multiplexed QPSK and 16QAM single-carrier system with frequency-domain-equalization over 800-km in-line transmission using binary training sequences. The sequences are designed to be practical and achieve accurate channel estimation in full-system demonstration.
We present a novel moments-based method for optical signal-to-noise ratio (OSNR) monitoring in polarization-multiplexed coherent optical systems. The method is experimentally demonstrated to show high accuracy in OSNR monitoring over a large range for both constant and non-constant modulus modulation formats.
Motivated by the recent concept of Space-Time Shift Keying (STSK), we propose a novel cooperative STSK scheme, which is capable of achieving a flexible rate-diversity tradeoff, in the context of cooperative space-time transmissions. More specifically, in our cooperative STSK scheme each Relay Node (RN) activates Decode-and-Forward (DF) transmissions, depending on the success or failure of Cyclic Redundancy...
In this paper, we propose a novel Space-Time Shift Keying (STSK) modulation scheme for MIMO communication systems, where the concept of spatial modulation is extended to include both the space and time dimensions, in order to provide a general shift-keying framework. More specifically, in the proposed STSK scheme one out of Q dispersion matrices is activated during each transmitted block, which enables...
We propose a complex-valued symmetric radial basis function (CV-SRBF) network for nonlinear beamforming in multiple-antenna aided communication systems that employ the complex-valued quadrature phase shift keying modulation scheme. The proposed CV-SRBF classifier explicitly exploits the inherent symmetry property of the underlying data generating mechanism, and this significantly enhances the detection...
Iterative multiuser receivers constitute an effective solution for transmission over multiple access interference (MAI) infested channels, when invoking a combined multiuser detector and channel decoder. Most reduced-complexity methods in this area use the complex-valued minimum mean squared error (CMMSE) multiuser detector (MUD). Since the desired output of BPSK systems is real-valued, minimizing...
The paper considers adaptive beamforming assisted receiver for multiple antenna aided multiuser systems that employ binary phase shift keying (BPSK) modulation. The standard minimum mean square error (MMSE) design is based on the principle of minimising the mean square error (MSE) between the beamformer's desired output and complex-valued beamformer output. Since the desired output for BPSK systems...
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