The power spectrum of UWB-IR systems can be controlled by proper selection of any of the three entities pulse, modulation scheme and Time Hopping (TH) codes, or their combinations . This paper presents algorithms to design TH codes with good correlation properties for spectrum nulling at a selected frequency, of multiuser UWB signals, to avoid interference to narrow band systems. To improve the...

Chaotic signals typically have broadband spectrum. This property is desirable for applications that require robustness against interference, jamming and low detection probability. Those issues have been addressed by traditional communication systems by using spread spectrum and frequency hopping modulations. In chaos-based communications the broadband chaotic signal is generated at the physical...

Recent proposals to simplify the operation of the IoT include the use of Information Centric Networking (ICN) paradigms. While this is promising, several challenges remain. In this paper, our core contributions (a) leverage ICN communication patterns to dynamically optimize the use of TSCH (Time Slotted Channel Hopping), a wireless link layer technology increasingly popular in the IoT, and (b) ...

The medium-access control (MAC) protocols for wireless networks proposed or implemented to date based on collision-avoidance handshakes between sender and receiver either require carrier sensing or the assignment of unique codes to nodes to ensure that intended receivers hear data packets without interference from hidden sources. We present and analyze a protocol that we call channel-hopping mu...

An approximate analytical formulation of the resource allocation problem for handling variable bit rate multiclass services in a cellular round-robin carrier-hopping multirate multicarrier direct-sequence code-division multiple-access (MC-DS-CDMA) system is presented. In this paper, all grade-of-service (GoS) or quality-of-service (QoS) requirements at the connection level, packet level, and li...

This paper addresses a new architecturc for hlind adaptive beamforming when dealing with Frequency Hopping (FH) modulation in cellular mobile communications systems. The proposed Code Reference Beamformer (CRB) takes advantage of the inherent frequency diversity to estimate beforehand the noise plus interference correlation matrix, which is employed as the first part of the framework. Then, a s...

Real-time Radio Control (RC) systems require instantaneous response in the controlled device. RC systems have wide applications, including ad hoc networks. Imperfections in the wireless channel (noise and interference) result in randomly fluctuating latency in the response of the system. A lag occurs when the system latency exceeds a specified real-time threshold. System Lag Occurrence Probabil...

The Direct-Sequence Spread Spectrum modulation (DSSS) is a very attractive modulation technique for military communication systems, mainly due to its resistance to interference and low probability of detection. However, the synchronisation to the spreading code phase in the receiver takes time, which makes this technique less interesting for sending very short messages. In this paper a novel di...

The performance in terms of signal-to-interference ratio (SIR), teletraffic, and spectral efficiency of a combined macrocellular and microcellular network is investigated when either both types of cells share the same channel set, or when the channel set is partitioned between the macrocells and the microcells. The analysis is for time-division multiple access (TDMA) with frequency hopping, pow...

Body Area Networks (BANs) expect to exploit IEEE802. 15.4-2015-TSCH, proposing an efficient MAC layer for wireless industrial sensor networks. The standard relies on techniques such as channel hopping and bandwidth reservation to ensure both energy savings and reliable transmissions. With the expected growth of the BAN usage, we must now consider dense topologies, and interference. In this pape...