Designing a Spectrum Allocation Chart for Nigeria

The regulation of the radio spectrum today by government agencies addresses the issue of interference between radio stations by allocating, allotting and registering bands of radio-frequencies. The framework of management is done at the international, regional and national level. With this paper, we present a study of the radio spectrum allocation policies in some leading countries and Nigeria. However, narrowing the study down to the detailed design of spectrum allocation charts. The study used the information in the national table of frequency allocation (NTFA) to design the spectrum allocation chart of Nigeria with Photoshop application. The spectrum allocation chart was designed with high resolution for high zoom capabilities so that researchers can gain a quick overview of the radio services allocated in the radio spectrum in Nigeria.

Performance Analysis of Heterogeneous Networks in Presence of Deliberate Jammers Using Reverse Frequency Allocation

The demand of high data rate and ubiquitous coverage in heterogeneous cellular (HetNets) is increasing progressively. In order to meet this demand, sophisticated model having applied interference reduction scheme and cell association technique is needed. The small base station (sBS)are deployed inside the broadcasting area of macro base station (mBS), in heterogeneous cellular networks (HetNets). Since mBS has high transmission power therefore a large number of users get connected with mBS. This causes disproportion of load distribution across the HetNets. For load balancing users from high power mBS are migrated to low power sBS to increase network capacity and to decrease the load from mBS. This results in interference in the communication signal because of strong mBS Interference. Hence, we need interference management technique to mitigate interference and user association and to efficiently use sBSs’ resources. Inter-cell interference (ICI) limit the HetNets’ performance. Additionally, there exist deliberate jamming interference which depends on jammers transmission power and its proximity with the target, which notably degrades the network performance. In this paper, we employ reverse frequency allocation scheme (RFA) to reduce inter cell interference, deliberate jamming interference and to accomplish load balancing. The proposed setup is analyzed inquisitively and with the help of simulations. The result shows reduction in interferences as well as balance of load distribution in the network achieved by employing RFA scheme together with cell association.

Frequency Allocation for Wireless Fidelity (Wi-Fi) System using FDMA

As a core technology enabling factor for the next generation, it is provided to benefit cellular modems, wireless fidelity (Wi-Fi), multi-user seamless access. Recommend a fiction in this paper, multiple access scheme based on frequency-domain referred to as the frequency division multiple access (FDMA). Our studies indicate that FDMA represents a considerable improvement in spectral efficiency. In two variables, roughly equivalent to ordinary multiple access schemes, the hardware and computational complexity were being questionably presented. FDMA is one of the multiple access scheming which deals with the frequency of the system. Frequency allocation in the system or between the system plays an important role while transmitting and receiving the large size bits. While transmitting or receiving the large size bits, frequency allocation must be needed. To transmit the large bits, the frequency allocation should also be large, so that without any noise or interference, the transmitter can send the bits in allocated frequency. Not only does the transmitter, transmit the large bits, the receiver also receives the large-sized bits in allocated frequency. So that, this paper introduces the FDMA technique in Wireless Fidelity (Wi-Fi).

Mobile Communications: The Beginning

weThe problem to solve was the frequency allocation and power requirements. A working frequency for a given cluster had to be chosen high enough so that there are enough channels. The power radiated out by the mobile phone had to be large enough to reach the base station and low enough not to cause disturbance in the neighbouring cluster. Also the size of the clusters depended on population density, larger in urban environment, smaller in rural environment. The sudden growth of the number of mobile phones in the period 1994 to 1997 is noted and plotted.