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This paper provides a new spread spectrum signal detection in the presence of digital narrowband interference using nonlinear detectors by utilizing several moments in a frequency band. The proposed procedure amounts to a nonlinear processing on the received data and matched filtering. The performance assessments indicate that this receiver is able to(More)
Previous methods for narrowband interference suppression in spread spectrum systems require training sequences. In practical overlay systems, transmission of the training sequences is impossible, because narrowband system and spread spectrum system are two separate entities, and presently the narrowband systems are in use and standardized and any changes(More)
Overlaying spread spectrum systems on narrowband services has been proposed as a way to take greater bandwidth efficients with respect to sparsely narrowband systems. It is shown that, the performance of both narrowband and spread spectrum systems in a overlay situation significantly degraded by each other. This paper presents a new nonlinear detector which(More)
The problem of determining the distribution of sums of (weighted) log-gamma random variables occurs in spectrum sensing for cognitive radio. An infinite series is derived for the characteristic function of log-gamma random variables. Some special cases are identified for which the infinite series can be represented in terms of some well-known functions,(More)
The matched-filter detector is used to detect the presence of an MPSK signal in white Gaussian noise. The probabilities of detection and false alarm of the matched-filter detector are evaluated using Craig's method in terms of a simple one-fold integral. The matched-filter detector is compared to the optimal Bayesian detector whose performance is an upper(More)
—The problem of content delivery in caching networks is investigated for scenarios where multiple users request identical files. An adaptive method is proposed for the delivery of redundant demands in caching networks. Based on the redundancy pattern in the current demand vector, the proposed method decides between the transmission of uncoded messages or(More)
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