The large number of differences between highand low-redshift radio galaxies have almost all been discovered by looking at the bright 3C sample of radio sources. This has the disadvantage that the strong correlation between radio luminosity and redshift within a single sample makes it impossible to be determine whether these differences are the result of cosmic evolution or whether they are simp...

The topic of cognitive radios has been garnering a great deal of attention in the past several years. Opinions regarding the level of sophistication necessary to qualify a system as cognitive vary widely, and discussions have ensued regarding this technology. The software defined radio forum is also involved and has working group activity in the area of cognitive radio. Some of the working grou...

The dominant radio emission mechanism in radio-quiet quasars (RQQs) is an open question. Primary contenders include: low-power jets, winds, star-formation and coronal emission. Our work suggests that polarization emission-line studies can help to distinguish between these scenarios determine the primary contributor. multi-frequency, multi-scale study has revealed a composite jet "wind" outflow ...

In this paper, a new approach for estimating the number of wideband sources is proposed which is based on RSS or ISM algorithms. Numerical results show that the MDL-based and EIT-based proposed algorithm havea much better detection performance than that in EGM and AIC cases for small differences between the incident angles of sources. In addition, for similar conditions, RSS algorithm offers hi...

To encounter the emergent necessity of radio spectrum, which is a limited natural resource, proper utilization of the radio spectrum is a must. Introduction of cognitive radio networks can play a vital role to solve the spectrum scarcity. Cognitive radio uses an open spectrum allocation technique to make more efficient utilization of the wireless radio spectrum and reduce the bottleneck on the ...