In this paper, we consider the mitigation of cochannel interference in Bluetooth by means of adaptive frequency hopping (FH). Prior to sending packets, the proposed scheme classifies whether the next FH channel is in use by other signals or not. It also periodically classifies channels occupied by the WLAN signal to change the hopping frequency. For fast classification of busy channels, it divi...

Frequency Assignment is an important approach to mitigate multicell interference in cellular systems. In this paper, we consider the frequency assignement in such systems with frequency hopping. In particular we focus our attention on cognitive radio cellular systems as one of the very promising future access technologies, taking IEEE 802.22 as an example, which is currently under standardizati...

In previous papers we have considered fast-frequency hopping frequency shift keying. We have proposed a decoder with low error rate in channels with low signal to interference ratio. This decoder uses the Kolmogorov-Smirnov criterion statistics to differentiate transmitted codeword from others. In this paper we consider different goodness-of-fit criterion to improve the decoder error rate. We h...

A fundamental tradeoff in MAC protocol design for wireless ad hoc networks is between proactive and reactive coordination, where the latter is used to resolve access conflicts whose severity is determined by the former. In this paper, we describe Clique-Based RandomizedMultiple Access (CRMA), a distributed MAC protocol for wireless ad hoc network applications. Of the many objectives in MAC desi...

This paper analyzes a new transmitter–receiver architecture based on a modified version of unipolar–bipolar correlation proposed for a noncoherent multirate optical fast frequency hopping code-division multiple-access (OFFH-CDMA) system. The system assigns a frequency-shifted version (FSV) of the code used to transmit data bit “1” in order to transmit data bit “0.” For the original system, we s...

Time-Slotted Channel Hopping (TSCH) from the IEEE 802.15.4-2015 standard uses channel hopping to combat interference and frequency-selective fading. It has attracted large attention from the research community due to its properties: high reliability in terms of packet delivery rates, and increased predictability in terms of energy consumption and latency, as compared to commonly used lowpower C...

A novel iterative receiver is proposed for relay-assisted multiuser communications in which multiple users transmit to a destination with the help of a relay and using fast frequency-hopping modulation. Each user employs a channel encoder to protect its information and facilitate interference cancellation at the receiver. The signal received at the relay is either amplified, or partially decode...

When a wireless sensor network is deployed indoors, sensor nodes often need to compete for channel usage with other, more powerful devices such as 802.11 access points. To mitigate the effects of such external interference we propose Chrysso, a protocol extension specifically designed for data collection applications that leverages the channel diversity of sensor node radios. In the face of ext...

In this paper, the WCDMA inter-cell interference is carried-out for both, soft and hard handovers. The main parameters used to evaluate the proposed model were the other-cell interference factor and the outage probability. The results of this work allow us to compare any sort of frequency reuse schemes in this spread-spectrum multiple access technique.

A longstanding goal of reinforcement learning is to develop nonparametric representations of policies and value functions that support rapid learning without suffering from interference or the curse of dimensionality. We have developed a trajectory-based approach, in which policies and value functions are represented nonparametrically along trajectories. These trajectories, policies, and value ...