The project Dynamic Telecommunication Solutions (DynamiT) conducts research in the area of Dynamic Spectrum Access (DSA) to meet military and civilian demands on increased spectrum flexibility. DSA means that currently unused parts of spectrum may be accessed, used, by other users, as long as they do not cause unacceptable interference to the primary user. A DSA-capable radio system will continuously perform spectrum sensing of the part of the spectrum that it can use for communication. The sensing information is used to dynamically adjust its radio parameters, e.g. bandwidth, modulation. A closely related concept is Cognitive Radio (CR). A CR is a radio system that in addition to DSA capabilities also has knowledge of the user's communications needs and has the ability to autonomously make decisions on how to best meet those needs. In an earlier report, we proposed new spectrum sensing and allocation algorithms called ICF-detection and APD-detection. These algorithms are developed to consider the impulsiveness of interferences and have better performance than traditional spectrum allocation based on energy detection which only measures the power of the interfering signal in the frequency band of interest. The ICFdetector and APD- detector have been implemented in a simulation environment to evaluate their performance. Evaluation shows that the ICF- and APD-detectors can detect pulsed interferes at lower SNRs compared to energy detection. It is also shown that communication systems utilizing the new detection algorithms have lower symbol error rates than corresponding communication system using energy detection. A part of a cognitive radio's (DSA-capable radio's) function is to continuously monitor the part of the spectrum it uses for communications. Combined with the proper signal analysis, a CR is in fact an ESM tool. If multiple CRs are connected in a radio network, we get a distributed ESM capability "for free".