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In this paper, an overview of main results concerning THz detection by nanometer field effect transistors (FETs) and heterojunction based transistors (HBTs) is presented. Different GaInAs/InP and GaN/AlGaN nanometer field effect transistors based detectors are presented. We present also first Silicon C-MOS transistors based integrated circuits for wireless communication in sub-THz range. Special attention...
Collaborative reception has been proposed to improves the frequency utilization efficiency in wireless networks. This paper proposes a novel iterative noise cancelling receiver with soft-output lattice reduction (LR)-aided detector, which improves further frequency utilization efficiency. The proposed receiver achieves near optimum performance by removing an equivalent noise generating in the MMSE...
In this work, a two-user Rayleigh-faded asymmetric interference channel, where the interfering transmitter has two antennas and the other terminals have single antenna, is considered. Two encoding strategies based on single-user (SU) codes and multi-user (MU) codes, and two decoding strategies based on interference ignorant and joint decoding are considered. The diversity-multiplexing tradeoff (DMT)...
Ultra-wide band (UWB) communication is a viable solution for Wireless Sensor Network (WSN) and Internet of Things (IoT) due to low cost and low power requirement. However, UWB transceiver design is more complex due to large bandwidth and precise synchronization requirement. In this paper, we propose a simple peak detection based non-coherent UWB receiver, suitable for low data rate WSN and IoT based...
Differential spatial modulation (DSM) is a novel attractive alternative technique for coherent spatial modulation (CSM) without channel state information (CSI) at the receiver. In this paper, iterative detection is firstly employed to improve the performance of DSM schemes. With the Hamming distance of two matrices reduced to the sum of simple elements, a lowcomplexity iterative detection scheme for...
Modern wireless communication raise the demand for higher spectral efficiency, faster-than-Nyquist (FTN) signaling is able to increase transmission rate without expanding signaling bandwidth. In this paper, we develop a graph-based iterative FTN detector in the presence of phase noise (PHN). Wiener process is employed to model the time evolution of nonstationary channel phase. The colored noise imposed...
The recent progress in continuous-variable quantum key distribution (CV-QKD) systems has placed them in a competitive position with their conventional discrete-variable counterparts [1]. In particular, CV-QKD might be the better choice over short distances. When it comes to long distances, however, the story is different. One of the proposed solutions to improve rate-versus-distance performance is...
In non-destructive testing (NDT) and industrial process monitoring [1], reflection geometry is commonly preferred over transmission, because only one-side access to the sample is possible. State-of-the-art terahertz (THz) time domain spectroscopy (TDS) systems hitherto use different emitter and detector devices [2], such that either an angled THz beam path or a beam splitter is required to enable...
A covert communication system under block fading channels is considered, where users experience uncertainty about their channel knowledge. The transmitter seeks to hide the covert communication to a private user by exploiting a legitimate public communication link, while the warden tries to detect this covert communication by using a radiometer. We derive the exact expression for the radiometer's...
Ambient backscatter is a new technology that utilizes existing wireless signals of other communication systems to enable small devices to communicate with each other. One key problem for ambient backscatter is that if it will result in interference on existing communication systems. We investigate this problem in this paper. Specifically, we build up the theoretical system model for the ambient backscatter...
In this paper, we investigate the energy efficiency (EE) of massive multiple-input multiple-output (MIMO) systems with linear maximum ratio combining (MRC) and zero-forcing (ZF) receivers. To be practical, the baseband power consumption with algorithm computational complexity (ACC) is taken into account. Utilizing this model, we maximize the global optimal number of receiver antenna and sum rate with...
Indoor positioning for visible light communication (VLC) has gained significant attentions recently with the popularity of light-emitting diodes (LEDs). In this paper, we consider a typical application of VLC by proposing a three-dimensional positioning scheme for a target terminal equipped with multiple photodiodes (PDs). Given the relative coordinates between the target terminal and receiving PDs...
It is known that by extracting log-likelihood ratio (LLR) values from the received MIMO signals, a MIMO detector is able to exchange a posteriori soft information with a channel decoder to improve the error performance. A minimum mean-square error with parallel interference cancellation (MMSE-PIC) detector is considered to be a practical MIMO detector, but the computational complexity for the LLR...
With the reuse of identical training sequences by users in different cells, massive MIMO is severely affected by pilot contamination due to residual error in channel estimation. In this paper, we consider the traditional structure of the training phase, where orthogonal pilot sequences are reused, and analyze a recently proposed group- blind detector in the uplink of an interference- limited network...
In this paper, we consider a bit-interleaved coded modulation scheme (BICM) composed of an error correcting code serially concatenated with a M-ary non linear modulation with memory. We first compare demodulation strategies for both the coherent and the non coherent cases. Then, we perform an asymptotic analysis and try to show that the design of coding schemes performing well for both the coherent...
Instantaneous or statistical channel state information (CSI) is needed for most detection schemes developed in the molecular communication (MC) literature. Since the MC channel changes, e.g., due to variations in the velocity of flow, the temperature, or the distance between transmitter and receiver, CSI acquisition has to be conducted repeatedly to keep track of CSI variations. Frequent CSI acquisition...
Multiple-input multiple-output (MIMO) radars with wideband signals are useful to discriminate target in clutter. With wideband MIMO radar, the problem of extended target detection in compound-Gaussian clutter is considered in this paper. By obtaining target echoes from each antenna, the detector based on generalized likelihood ratio test (GLRT) is developed. It shows that the shape parameter of clutter,...
The Radiated emission measurement is one of the tests required in EMC testing. CISPR 25 standard specifies the frequency range and the antennas used for this purpose. In this paper, differences that appear when using different measurement antennas and different semi-anechoic chambers in radiated emissions testing on the same DUT are investigated. Results show sometimes significant differences that...
In this paper design, implementation, laboratory and microgravity tests of a space tether length and length rate measurer are discussed. The instrument presented was part of an experimental setup consisting in a new concept of space tether deployer with retrieval capability, which was designed and built in the framework of the Drop Your Thesis! 2016 educational programme, held by the European Space...
In this paper, an interferer-tolerant receiver for the first group of ultra-wideband systems (3.1–4.8 GHz) is presented. The entire system operates in two modes; detecting and receiving. In the detecting mode, the locations of up to three blockers in 2.35–2.75 GHz and 5.1–5.9 GHz bands are reported to three notch filters used in the receiving path for rejection. In the receiving mode, the receiver...
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