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Mobile phone front-end and baseband modules are hard to obtain on the market for end customers. Thus, software defined radios are widely used in research and development, enabling many opportunities for digital signal processing. In this publication a novel option to receive GSM signals is suggested by using an ultra-low power Sub-GHz transceiver in a legacy mode. The device outputs raw demodulated...
In this work, we implement and demonstrate differential amplify-and-forward (DAF) cooperative relaying as a novel diversity technique to combat bit errors and outages common in airborne environments. By using differential modulation and demodulation, we reduce the system complexity by avoiding channel estimation which is often unreliable or computationally costly in dynamic environments with mobile...
The latest extended-coverage (EC-GSM-IoT) and high-throughput (EGPRS2A) enhancements make GSM competitive to LTE-based cIoT standards such as NB-IoT with the advantage of global coverage today. This work introduces the first fully-integrated RF-SoC supporting the complete GSM standard family ranging from EC-GSM-IoT through EGPRS2A. The RF-SoC achieves −121.7 dBm receiver sensitivity and peak data...
We investigate secure communication over a channel under two different classes of attacks at the same time: a passive eavesdropper and an active jammer. This scenario is perfectly modeled by the concept of arbitrarily varying wiretap channels (AVWCs). It has been shown that uncorrelated codes are not always capable of overcoming the various jamming attacks. On the other hand, correlated random codes...
In this paper, quantized and triggered control is utilized to sample output error signal for output feedback synchronization of two Lurie systems (formed by linear part and nonlinear one constructed only by the measurable output) under limited transmission capacity. With the characteristics of output error, we come up with practical quantized and triggered strategy to sample the output error instead...
The lack of knowledge of the transmitted codeword limits the synchronization capability of the concatenated code,consisting of a low-density parity-check (LDPC) code and a watermark code, which is used to correct nonbinary insertion/deletion errors. In order to improve the synchronization error-locating capability of the watermark decoder and further decrease the error probability of the system, an...
We consider the problem of constructing codes that can correct δ deletions occurring in an arbitrary binary string of length n bits. Varshamov-Tenengolts (VT) codes can correct all possible single deletions (δ = 1) with an asymptotically optimal redundancy. Finding similar codes for δ ≥ 2 deletions is an open problem. We propose a new family of codes, that we call Guess & Check (GC) codes, that...
Crowdsourced signal monitoring systems are gaining attention for capturing the wireless spectrum at large geographical scale. Yet, most of the current systems are still limited to simple power spectrum measurements reported by each sensor. Our objective is to enhance such systems with signal decoding capabilities performed in the backend while retaining the original vision of a low-cost and crowdsourced...
In this paper, we design a fast and efficient energy-based and asynchronous neighbor discovery protocol for the Internet of Things (IoT). In our solution, we relax the assumption of frame-level synchronization. We formulate a novel asynchronous group testing scheme and apply it to the neighbor discovery problem. We then show that our proposed scheme is able to detect the set of K active neighbors1...
In this paper, a 14-bit 300-MHz current-steering digital-to-analog converter with output transimpedance stage is presented. The drain-source voltages of MOS devices in real current sources could be stabilized within a limited small range due to the feedback of opamp in transimpedance stage. The nonlinear distortion caused by current sources could thus be suppressed. The simulated INL and DNL are below...
The number of IPs running concurrently on an FPGA has increased in recent years. Communication among these IPs has necessitated the introduction of the network on chip (NoC) for low-power, high-performance, and scalable on-chip networking. While NoCs are superior to traditional shared buses, there is an attendant resource overhead incurred by the NoC links, routers and network adapters. We present...
A partial parallel architecture for LDPC (Low Density Parity Check Code) decoder is proposed. The overall architecture is based on MIMD (Multiple Instruction Stream Multiple Data Stream), the internal calculation unit is based on SIMD (single instruction Stream multiple data Stream). The processor uses the programmable method to realize the NMS (normalized minimum sum) decoding algorithm, can get...
The FSM-SADF model of computation is especially suitable for analysing real-time applications with input-dependent behaviour such as different modes, variable execution times and scalable parallelism. Although FSM-SADF specifies which scenario transitions are possible, it does not specify how and when they are decided at runtime. Multiple actors of a scenario, e.g. video stream header parsing, may...
In an energy-efficient receiver employing iterative decoders, phase synchronization errors reduce much of the gains that can be achieved at low SNRs. To address this problem, the concept of an iterative receiver has received much attention in the past. In such a framework, signal degradation at low SNR is overcome by repeated phase synchronization executed over the soft symbols generated by the iterative...
We investigate a synchronization method for channels that are impaired by insertion, deletion, and substitution (IDS) errors and include outer low-density parity-check (LDPC) codes with error-correction capabilities and inner marker codes for synchronization. We improve synchronization using fixed-symbols, and evaluate the achievable rate by a specific fixed-symbol assignment. We demonstrate via...
Time synchronization (TS) represents an important necessity for many industries in fields such as communications, manufacturing, and power systems related to electrical networks, microgrids, and renewable energies, among others, because it can ensure that cooperating processes or systems can interoperate correctly; further, the scheduling of specific tasks through a timestamp can be done. Among different...
The problem of one-way file synchronization from the client to the data-center, namely, file updates, is studied. The problem is investigated in particular when an old version of a file which can be available at both client and data-center, is edited by the client to a new version. The edits are modeled as random insertions and deletions (InDels). Based on the updated and the previous version of the...
File synchronization is a critical component of many modern data sharing applications. File synchronization is particularly challenging when different versions of a file that need to be synchronized differ in some number of edits. Several recent works have studied exact synchronization under edit errors. In this paper, we extend the available analytical toolbox of file synchronization by focusing...
We present a per-channel framework for extending monochrome barcodes to color for display applications, offering increased data rates and capacity. Data is independently encoded into barcodes, incorporated within a color image as the red (R), green (G), and blue (B) channels and decoded from the corresponding R, G, and B channels in the image of the displayed barcode captured with a smartphone. Using...
An exposition of the results on synchronization and state estimation of nonlinear systems over the limitedband communication channel is given. Relevance of passifiability condition for controlled synchronization of master-slave nonlinear systems for first order and full-order coder/decoder pairs is demonstrated. The algorithm for state estimation of spatially distributed systems based on the local...
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