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Traditional communication system typically separates the configuration of the physical layer from the network traffic load and topology. In this paper, we study how to apply physical-layer network coding considering the locations and traffic loads of multiple nodes in multiple-input multiple-output (MIMO) networks. We propose the heterogeneous-modulation physical-layer network coding (HePNC) design...
Generalised spatial modulation (GSM) is extended from the concept of spatial modulation (SM). Due to its superior energy efficiency to classical multiple-input multiple-output (MIMO) techniques, GSM has attracted plenty of interest under the study of large-scale MIMO systems. In this paper, we propose a low-complexity symbol detector for GSM based on the framework of sparse Bayesian learning (SBL),...
We present in this paper a partial coherent receiver for detecting (at the relay) the modulo-2 sum bit of the uplink orthogonal modulations in a two-way relay communication system with physical network coding and fading. The detector exploits the availability of implicit pilot symbols in every signaling interval of an orthogonal modulation and is able to provide reasonably accurate data recovery without...
Currently, it is widely recognised that a measurement of the polarization status of cosmic sources high energy emission is a key observational parameter to understand the active production mechanism and its geometry. Therefore, new instrumentation operating in this energy range should be optimized also for this type of measurement. In this framework, we present the concept of a small high-performance...
A High-rate Spatial Modulation (HR-SM) scheme, whose maximum spectral efficiency is in proportional to the number of transmit antennas nT, was proposed in [1]. However, the complexity of its maximum likelihood detector grows exponentially with nT, making it impractical as nT increases. Based on the codeword structure of the HR-SM scheme and on the conventional successive-interference-cancellation...
In this paper, we propose a low-complexity soft-input soft-output (SISO) detection algorithm for MIMO-OFDM systems, based on Eigen-Value decomposition (EVD), which using the real diagonal matrix inversion instead of the complex matrix inversion to reduce the complexity of the iterative receiver. The main objective of this paper is focused on the reduction of overall implementation complexity of the...
Maximum likelihood (ML) based modulation detector provides the optimal performance in the sense that the detection error probability is minimized, if no prior probability of candidate modulations is available at the modulation detector. However, the evaluation of the likelihood function requires prohibitively high computational complexity. This contribution deals with an approximation of the ML detector,...
In this paper, we consider adaptive quadratic amplitude modulation (QAM) for a cooperative network consists of a source, one decode-and-forward (DF) relay and a destination which are single antenna systems. For increasing the spectral efficiency of the system, we use adaptive modulation method for data transmission. We propose a new adaptive modulation scheme which has less complexity than available...
In this paper, we propose a new detection technique for multiuser multiple-input multiple-output (MU-MIMO) systems. The proposed scheme combines a lattice reduction (LR) transformation, which makes the channel matrix nearly orthogonal, and then employs a multi-branch (MB) technique with successive interference cancellation (SIC). A single LR transformation is required for the receive filters of all...
Simultaneous broadcasting of multiple services in multiple-input and multiple-output (MIMO) broadcasting system is highly desirable. In this paper, the recently proposed technique, bit division multiplexing (BDM), is applied to MIMO broadcasting system, which significantly improves the spectral efficiency of multi-service broadcasting compared with conventional time division multiplexing (TDM) approach...
Tens of thousands of optical data transmission links are currently installed in all four experiments at the Large Hadron Collider (LHC) [1] for the transmission of timing, control and read-out data to and from the detector systems. Work has started on identifying new technologies and optical components which could meet the requirements of the High-Luminosity LHC (HL-LHC); an upgrade of approximately...
In this work, a transmission scheme that combines multi-layer multi-rate (MLMR) coding with quasi-orthogonal space-time block coding (QO-STBC) is proposed. Firstly, the proposed QO-STBC codewords set unequal diversity orders for different transmitted spatial data layers. Then, different spatial data layers are protected by different-rate channel codes with the aim of achieving the same post-decoding...
Spectrally Efficient Frequency Division Multiplexing (SEFDM) is a non-orthogonal multi-carrier communication technique that can pack more sub-carriers than Orthogonal Frequency Division Multiplexing (OFDM) for a given bandwidth. In this paper, we propose a hybrid soft Iterative Detection (ID) together with Fixed Sphere Decoding (FSD) for QAM modulation schemes from 4QAM to 16QAM. In terms of 4QAM,...
In this paper, an ultra-low-power area-efficient 12-bit extended counting analog-to-digital conversion (EC-ADC) is presented. A double-sampling configuration for incremental ΣΔ modulators is proposed to halve the clock frequency of EC-ADC for the same conversion accuracy and rate. A class-AB operational transconductance amplifier (OTA) for low power EC-ADC is developed. The proposed architecture has...
This paper presents a reduced-complexity low power error-resilient K-Best MIMO Detector. A novel tree-enumeration method is proposed such that the error-resilient detection processes a reduced search space and is more suitable for VLSI design. Moreover, a circuit-level optimization is employed to further simplify the complexity. Experimental results are given showing that the circuit-level optimization...
In this paper, a CMOS monolithic digitized light detector for light monitoring applications is newly proposed. The proposed chip is attractive due to the fact that analog processing circuits and light sensor are integrated robustly and compactly. The output signal of the proposed chip is a pulse stream, it could be easily sent over a wide range of transmission media, such as PSN, radio, optical, IR,...
This paper concerns developing a low complexity detector for spectrally-efficient Frequency-Division-Multiple-Access (FDMA) multiuser systems based on Continuous-Phase-Modulation (CPM). A class of tree-trellis-search based algorithms is proposed for joint/iterative detection and the complexity is further reduced employing a state-reduction technique based on mismatched filters. The proposed detector...
Spatial Modulation (SM) is a recently proposed single-RF multiple-input-multiple-output (MIMO) technique, which is capable of outperforming many conventional MIMO transmission schemes with low implementation and computational complexity. Recently, there have been some attempts in understanding the performance of SM in multi-user environments. However, most of the work has been oriented towards uplink...
For underwater acoustic (UWA) communications, a robust iterative channel estimation based minimum mean-square-error (MMSE) adaptive turbo equalizer is proposed and studied for multiple-input multiple-output (MIMO) detection. Rather than the classical MMSE or normalized least mean squares (NLMS) estimation algorithms, the improved proportionate NLMS (IPNLMS) is adopted for the iterative MIMO channel...
The ability to accurately observe the Earth's carbon cycles from space gives scientists an important tool to analyze climate change. Current space-borne Integrated-Path Differential Absorption (IPDA) lidar concepts have the potential to meet this need. They are mainly based on the pulsed time-of-flight principle, in which two high energy pulses of different wavelengths interrogate the atmosphere for...
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