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CDMA-based technologies deserve assiduous analysis and evaluation. We study the performance, at call-level, of a CDMA cell with interference cancellation capabilities, while assuming that the cell accommodates different service-classes of batched Poisson arriving calls. The partial batch blocking discipline is applied for Call Admission Control (CAC). To guarantee certain Quality of Service (QoS)...
In this paper, we consider a multirate teletraffic loss model for the calculation of congestion probabilities in a Wideband Code Division Multiple Access (W-CDMA) cell that utilizes the Bandwidth Reservation (BR) policy and supports calls generated by a finite number of users. The BR policy is used particularly to equalize congestion probabilities among calls of different service-classes. In the proposed...
This paper describes the way of modeling compatibility with broadcasting application by using SEAMCAT. A new SEAMCAT plugin was developed in order to enable user to visualize areas where the broadcasting coverage may be affected by external interference.
Reliable spectrum sensing is the key requirement for secondary users to opportunistically utilize the spectrum in the absence of primary users. To increase the secondary user's throughput and efficiency, it has to be able to detect the needed white band out of all possible bands in the shortest possible time. To speed up the spectrum sensing process and to minimize the power consumption overhead,...
Time reversal mirror technology is a new method of localization, which may be applied to target detection and localization effectively. Intensive coherent interference will conduct the autonomous underwater vehicle focus on the strong interference and reduce the detection probability. This paper brings out time reversal passive shielding and focusing (TRPSF) method with two vector-sensors' vertical...
This paper proposes a new judging method of EMC based on signal detection theory. First of all, the traditional judging method of interference measure is introduced, and its disadvantage is pointed out. Then, the signal processing of radar system is analyzed, and the relationship of detection probability (pd) and interference to noise ratio (INR) is established. Based on the definition extension of...
Although the method of cooperative spectrum sensing can greatly improve the sensing performance, the consumption of system resources will increase as the number of cooperative sensors increases, therefore, the number of cooperative sensors to use is a compromise between sensing performance and consumption of system resources. Firstly, based on the expression for the probability of detection, a sensor...
In this paper a technique of Hough detector threshold procedure for moving target detection in conditions of randomly arriving impulse interference with Poisson distributed flow and Raleigh amplitude distribution is proposed. The expressions of detection and false alarm probability are derived for a highly fluctuating Swerling II target. A comparative analysis of the performance of a Hough detector...
The impact of noise AM jamming on starting probability of pseudo-random binary-phase-coded fuze (PRBPCF) is researched in this paper. Analysis model of the starting probability is set up, and the starting probability of the PRBPCF is deduced under noise AM jamming. Factors influencing the starting probability are discussed. The simulation results show that the starting probability is affected not...
The problem of the detection of a signal in the presence of broad-band noise and interferences that lie in a subspace that is imperfectly known is considered. It is assumed that a basis (or generating set) of the interference subspace is known up to additive white Gaussian noise. This amounts to assuming that each of these basis vectors lies in a cone, the aperture of which depends upon the level...
For a multiuser bit interleaved coded OFDM (BIC-OFDM) system, we study the methods of time domain equalization and per-subcarrier maximum likelihood (ML) frequency domain equalization when there is timing asynchronism among the users. For the time domain equalizer structure, a coded pairwise error probability (PEP) approximation is derived, which leads to a training-based space-time design method...
Under radio frequency (RF) noise jamming, jamming effect of pseudo-random binary-phase-coded fuze (PRBPCF) is researched based on its starting probability. Analysis model of starting probability is set up, and the starting probability of the PRBPCF is deduced under RF noise jamming, Factors influencing the starting probability are discussed. The simulation results show that jamming effect of the PRBPCF...
In this paper, we study the reverse link (RL) capacity of a co-channel macrocell-femtocell network, where the macrocell and femtocell networks share the same carrier. The analysis is done based on an outage probability criterion, and we use this analysis further to compare the capacities of different practical multi-carrier macrocell-femtocell deployment strategies.
Signal detection problems are traditionally viewed as statistical hypothesis testing. In absence of the a priori probabilities, such as in radar, the Neyman-Pearson criterion is used where a certain false alarm probability is set, and the probability of detection is maximised. In signal sensing problems of cognitive radio, the main constraint is to avoid the interference with the primary user. Once...
We consider a two-user interference channel where the users are not synchronous meaning there exists a delay between their transmitted codes. Assuming no user is aware of the location of the interference burst on its code, no interference cancellation is performed, i.e., users treat each other as noise. By the same token, the interference is no longer Gaussian as a result of the ambiguity on the start...
This paper considers usage of a single-frequency mode for cell coverage extension in infrastructure-based relay links. We provide new closed-form expressions for outage probability by taking into account practical constraints such as interference due to frequency reuse and signal leakage between the relay transmitter and receiver. The analysis covers both decode-and-forward and amplify-and-forward...
The multihop spatial reuse Aloha (MSR-Aloha) protocol was recently introduced by Baccelli et aL, where each transmitter selects the receiver among its feasible next hops that maximizes the forward progress of the head of line packet towards its final destination. They identify the optimal medium access probability (MAP) that maximizes the spatial density of progress, defined as the product of the...
Interference and delay are considered as the main reasons limiting the capacity and increasing the new call blocking probability in the cellular systems. The Probability of handover failure is considered a common criterion for performance evaluation of handovers in cellular systems. In this paper we discuss and analyze cognitive radio handover managements based on social agent technology in cellular...
The call-level performance modelling and evaluation of 3G cellular networks is important for the proper network dimensioning and efficient use of the network resources, such as bandwidth and power. In the case of the wideband code division multiple access (W-CDMA) cellular networks, this task is complicated, not only because of the so called soft blocking, the multiple access interference (MAI) and...
Spectrum sensing in the context of wireless microphone (WM) signals is considered in this paper. The spectrum sensing algorithm developed in this study makes use of the property that the bandwidth of the WM signal is narrow compared with the bandwidth of a digital television (DTV) channel. As a result, the power of the WM signal is highly concentrated in the frequency domain and there are apparent...
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