With the wide use of GPS, it becomes more and more important to improve the positioning accuracy. The GPS signal is very weak, and can be easily interfered. Space-time adaptive processing(STAP) can suppress the jamming not only in the temporal domain, but also in the spatial domain. STAP has now become a good candidates for jamming mitigation in GPS. In order to evaluate the performance of vari...

In December 2017, the Third Generation Partnership Project (3GPP) released the first set of specifications for 5G New Radio (NR), which is currently the most widely accepted 5G cellular standard. 5G NR is expected to replace LTE and previous generations of cellular technology over the next several years, providing higher throughput, lower latency, and a host of new features. Similar to LTE, the...

Performance degradation caused by channel dispersion can be mitigated using avoidance techniques such as frequency hopping spread spectrum. Adaptive frequency hopping techniques such as matched frequency hopping (MFH), clipped matched frequency hopping (CMFH) and advanced frequency hopping (AFH) have been introduced as efficient techniques in slowly fading dispersive channels. These techniques ...

Wireless networks are more depicted to intentional or unintentional threats than their wired based equivalent networks. Major reason being the wireless medium which can be listened and interfered by non-participants, in an on-going valid communication. In the absence of a collision detection mechanism and relying mainly on cooperation of each other for packet routing, the standard defined for w...

MAC layer jamming is a common attack on wireless networks, which is easy to launch by the attacker and which is very effective in disrupting the service provided by the network. Most of the current MAC protocols for wireless networks, for example, IEEE 802.11, do not provide sufficient protection against MAC layer jamming attacks. In this paper, we first use a non-cooperative game model to char...

Spread spectrum (SS) communication systems are now commonly used in civilian applications such as cellular systems and GPS and are fast becoming one of the most commonly used systems. Very low power SS systems such as Global Positioning Systems are extremely vulnerable to high power jammers. A vast array of techniques are available to resolve this problem and this paper attempts to review some ...

Interference, either unintentional (from heterogeneous users in spectrum sharing systems) or intentional (jamming), degrades the performance of existing licensed and unlicensed spectrum services. In particular, interference will be of increased importance in future cognitive radio spectrum sharing systems, which are likely to be based on orthogonal frequency division multiplexing (OFDM). This p...

Vehicular Ad-hoc Network (VANET) is taking more attention in automotive industry due to the safety concern of human lives on roads. Security is one of the safety aspects in VANET. To be secure, network availability must be obtained at all times since availability of the network is critically needed when a node sends any life critical information to other nodes. However, it can be expected that ...