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Wireless communication service providers are having to co-locate base stations (BTS) on common sites, since little space is available to build new ones. BTS receivers have to receive weak desired signals at the presence of strong transmit signals from co-located transmitters; resulting in interference and desensitization. This leads to higher dynamic range requirements for BTS receivers. The paper...
We propose a power scalable digital base band for a low-IF receiver for IEEE 802.15.4-2006. The digital section's sampling frequency and bit width are used as knobs to reduce the power under favorable signal and interference scenarios, thus recovering the design margins introduced to handle worst case conditions. We propose tuning of these knobs based on measurements of Signal and the interference...
RF receiver is the key component of receiver. In this paper, the behavioral simulation model of RF receiver is made through the simulation of many parameters, such as gain, noise factor, dynamic range and so on. On the basis of above, the model is validated by experiment. It's helpful to evaluate the receiver EMC quantificationally.
We consider a wireless communication model where a large number of transmitter-receiver pairs share a common Rayleigh fading channel without any coordination between them. The performance of a simple coexistence etiquette is analyzed in details, where packets are allowed to be transmitted from a given terminal only if the signal-to-interference-plus-noise ratio (SINR) at their intended receiver exceeds...
Several regional augmentation GNSS systems (like SBAS) are already fully operational and other are under development with new frequencies and signals on the way. Therefore, it becomes imperative to guarantee for all GNSS users the compatibility, interoperability and interchangeability between all these systems. The goal is to ensure that the user's multi-mode receiver can choose and mix signals from...
Linear and nonlinear receiver structures based on Minimum Mean Square Error (MMSE) linear combiner are proposed to mitigate the effect of multiuser interference in uplink Direct Sequence overloaded Code Division Multiple Access (DS-CDMA) system. The proposed mitigation algorithm exploits the inherent multi-path diversity and diminishes the effects of both Inter Symbol Interference (ISI) and Multiuser...
In this paper, we consider a cognitive relay assisted single-input multiple-output (SIMO) communication scenario through Rayleigh fading channel where multiple primary and secondary users wish to communicate with two different receivers in the presence of a cognitive relay. We assume that secondary users transmit simultaneously with the primary users over the same channel instead of waiting for an...
This paper describes a method to mitigate interference when the cyclic prefix (CP) is totally removed for shaped orthogonal frequency division multiplexing (OFDM) signals. The CP is removed to increase system throughput while shaping is applied to increase the spectral efficiency. Samples in the shaping extension are used to restore part of the cyclicity information missing in the ith received symbol...
Spectrum sharing has attracted a lot of attention in cognitive radio recently, as an effective method of alleviating the spectrum scarcity problem, by allowing unlicensed (secondary) users to coexist with licensed (primary) users under the condition of protecting the latter from harmful interference. In this paper, we focus on the throughput maximization of spectrum sharing cognitive radio networks...
For non-contiguous OFDM (NC-OFDM) based cognitive radio (CR) systems, one of huge challenges is to establish spectrum synchronization before data transmissions. In this paper, we propose a novel active subchannel detection scheme for the NC-OFDM receiver without out-of-band spectrum synchronization information. The key idea of the proposed scheme is to employ the received training symbol to calculate...
We address the coexistence problem between macrocell and femtocell systems by controlling the aggregated interference generated by multiple femtocell base stations at the macrocell receivers in a distributed fashion. We propose a solution based on intelligent and self-organized femtocells implementing a realtime multi-agent reinforcement learning technique, known as decentralized Q- learning. We compare...
In this paper, we analyze the outage performance of cognitive Z-interference channel where two-path cognitive relaying is used to improve bandwidth utilization efficiency of cognitive user transmission while simultaneously leading to improvement in outage performance of primary user. Cognitive relays have non-causal message knowledge of cognitive user and use interference pre-cancellation scheme to...
In this paper a composite analytical model of DS-CDMA wireless communication system considering multipath Nakagami fading along with Doppler frequency shift, tracking jitter, local oscillator frequency offset and multi-access interference (MAI) for different PN sequences is presented. The analysis presents the development of a novel approach to find the pdf (probability density function) of the signal...
In this paper, studies are performed and techniques are proposed for interference mitigation in Transmitted Reference ultra wideband (TR-UWB) system. The best method for suppressing and reducing the mutual interference is without modifying interfering systems. The coexistence of multisystem is given by: (a) Interference reduction from UWB systems to other narrowband (single and multiple) and wideband...
The automotive sector requires ever higher availability, accuracy and reliability from the position solution. The demands of novel and innovative driver assistance systems can not be completely fulfilled, at an acceptable price, by current GNSS receivers. There is a need for a cost effective receiver so that driving assistance systems can be realised. In such applications a receiver has to deliver...
Atmospheric scattering for ultraviolet signals enables non-line-of-sight communication of a transmitter-receiver pair on-the-move and adaptive network configuration. In this work, we first develop an experimentally validated path loss model which characterizes both multiple scattering and arbitrary pointing with noncoplanar geometry. Then we discuss how to achieve full duplexing. We suggest transmission...
In this paper, results on the mutual information of MIMO transmission over spatially correlated channels in slow fading environments are presented. Different receiver techniques such as optimal maximum likelihood detection, parallel layer detection, successive interference cancellation detection and linear detection are compared. The transmit signals are derived from finite signal alphabets such as...
In this paper an algorithm suitable to interference detection for terminal embedding commercial GNSS chipsets is presented. The algorithm monitors the value of the C/N0 estimated by the receiver for multiple channels and a detection rule is set in order to obtain the desired performance in terms of false alarm and detection probabilities.
Array processing is a very promising technology for mitigation and detection of radio interference in receivers of satellite navigation systems. This paper presents early results of a multi-antenna receiver measurement campaign in Berchtesgaden GATE.
The E5 and E6 bands, which will be used by Galileo, will have to be shared with many ground-based applications in the aeronautical, communications and military domains. It becomes crucial to evaluate the effects of interference from terrestrial sources on the performance of GNSS Receivers. In order to solve this issue, the data recording in different locations (e.g. urban, rural and airport) in addition...
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