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Substrate computing refers to a paradigm where sensing, computing, communications, energy scavenging and energy storage functions are seamlessly integrated within a substrate. The substrate could be a part of an aircraft wing or a chassis of the car and the computing, communications and energy scavenging functions could be implemented using self-powered devices embedded inside the substrate. In this...
Among the filter bank multicarrier techniques for efficient transmission in communication systems, the recently proposed FBMC-PAM transceiver exhibits many advantages in comparison with the OFDM system; in particular, it does not require a cyclic prefix and, in the asynchronous multi-user context, it provides a high level of spectral separation among users. However, a performance loss is encountered...
We identify phase noise as a bottleneck for the performance of digital self-interference cancellers that utilize a single auxiliary receiver — single-tap digital cancellers — and operate in multipath propagation environments. Our analysis demonstrates that the degradation due to phase noise is caused by a mismatch between the analog delay of the auxiliary receiver and the different delays of the multipath...
This paper presents a 10-Gb/s power-efficient serial-link transceiver for the Internet-of-Everything applications. The proposed transceiver employs several techniques to reduce the power consumption. This includes the use of forward clocking with a simplified clock recovery scheme, multiplexing the transmitted signal at the output of voltage-mode drivers, and using modified slicers in the receiver...
Parallel Sequence Spread Spectrum (PSSS) is a physical layer (PHY) baseband technology that is well suited for mixed-signal transceiver implementation for high data rate wireless communication systems. Mixed signal baseband realization allows for easier implementation of the channel equalization function and eliminates the need for high speed data converters. System design and architecture of a mixed...
The electromagnetic susceptibility of Radio-Frequency (RF) Front-Ends is studied. A RF receiver has nonlinear properties induced by its first stages (Switch, Low-Noise Amplifier and Power Amplifier). Two tones are injected in the RF system, with interference signal power ranging from low to high level. It creates inband intermodulation products (IM), which are partly reflected at the input and become...
In the report, self-organization in wireless ultrawideband sensor networks is considered as an approach aimed at solving two problems: establishment of links between network nodes and switching the network nodes into synchronous data transmission mode. An experimental UWB wireless sensor network with chaotic carrier on physical layer is described. This network belongs to the class of wireless personal...
A major challenge in realising a full-duplex (FD) transceiver is to decode the received signal in presence of the strong transmit signal termed as self-interference (SI). Usually SI is suppressed by reconstructing it using the transmit signal and subtracting it at the FD receiver. For good cancellation, an accurate estimate of the SI channel is essential. However, training for obtaining the SI channel...
In-Band Full-Duplex transmissions are promising solutions for wireless 5G small cell communication scenarios. It allows to increase the overall capacity under certain conditions. In this paper we evaluate two combined techniques to mitigate the analog self-interference. Instead of using high performance components with high linearity and high bandwidth for a frequency band, a single SDR chip has been...
Non-orthogonal multiple access (NOMA) is envisioned to be one of the promising radio access techniques for the fifth generation (5G) mobile networks. In this paper, a portable NOMA testbed based on software defined radio (SDR) is developed by transporting our NOMA system to mini personal computers (PCs). Moreover, the NOMA testbed has been enhanced from 5 MHz bandwidth to 10 MHz bandwidth. As the...
In this paper, we consider optimal transceiver design and relay selection for simultaneous transfer of data and energy in a cooperative network consisting of amplify-and-forward (AF) relays. In this context, we address two different problems and propose optimal relay selection and transceiver processing. Furthermore, the problems are formulated for both time switching (TS) and power splitting (PS)...
Conventional methods of codebook design in limited-feedback multi-antenna systems aim to quantize the single-user channel but without considering secrecy requirements. Thus, the information leakage is inevitably aggravated due to the eavesdropping behaviors in limited-feedback multiple-input single-output single-antenna- eavesdropper (MISOSE) systems. To reduce the information leakage without any...
Stringent mobile usage characteristics force wireless networks to undergo a paradigm shift from conventional connection-centric to content-centric deployment. With respect to 5G, caching and heterogenous networks (HetNet) are key technologies that will facilitate the evolution of highly content-centric networks by facilitating unified quality of service in terms of low-latency communication. In this...
Clutter heterogeneity caused by cultivation variation of the terrain properties degrades STAP detection performance. In recent years, a priori knowledge sources has been used directly and indirectly for STAP performance improvement. Monostatic radar systems are typically considered, but in the bistatic case, strong clutter non-stationarity introduced by the geometry makes convetional STAP not possible...
This paper presents a fully implantable brain machine interface based on a new CMOS system-on-a-chip (SOC) including a low-power multi-channel current-reuse analog front-end (AFE), a multi-band wireless transceiver and a power management unit retrieving power from a 13.56 MHz carrier through a new 5-coil inductive link. In addition to this SOC, the proposed interface includes a low-power microcontroller,...
Appearing on the stage quite recently, the Low Power Wide Area Networks (LPWANs) are currently getting much of attention. In the current paper we study the susceptibility of one LPWAN technology, namely LoRaWAN, to the inter-network interferences. By means of excessive empirical measurements employing the certified commercial transceivers, we characterize the effect of modulation coding schemes (known...
An IEEE 802.11ah-compliant RF transceiver with a direct-conversion receiver and a fully-digital polar transmitter is presented. For the receiver, a current-mode RF front-end covers the mandatory modes worldwide from 755MHz to 928MHz. The digitally-assisted analog baseband achieves variable gains and bandwidths with an automatic gain/DC-offset calibration. Implemented in 40nm CMOS with 1V supply, this...
Commercially available off the shelf Software Defined Radios (SDR) have many of the components required to construct an OFDM or a stepped frequency GPR. Some additional components are required in order to make phase measurements however, as described here. There are also design features of the SDR used here which could make them unsuitable, but which can be mitigated as investigated here.
This paper presents a dual-band 2×2 WiFi transceiver in 28nm bulk CMOS. Achieved receiver and transmitter EVM floor at 5GHz for 160MHz per channel are −35dB and −33dB, respectively. The 2.4GHz integrated PA provides 26.5dBm saturated output power while its 5GHz counterpart delivers 26dBm. The 2.4GHz receiver features mixer first architecture while the transmitter includes a 2nd harmonic notch for...
This paper presents the preliminary results of a new study aimed at minimizing the crosstalk effect in the receiver of a frequency-modulated radar. The main idea consists of performing a calibration of the system in absence of targets by analyzing the intermediate-frequency signal at the output of the radar receiver to compute a variable threshold according to the crosstalk amplitude. An electromagnetic...
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