Abstract
The development of technology has opened up a new wireless infrastructure to complement the satellite and terrestrial networks. High Altitude Platforms (HAPs) is a communications infrastructure that uses air balloon as a solution between terrestrial and satellite communications systems with medium coverage and low cost o f launching and maintenance. HAPs can be joined with a Long Term Evolution (LTE) technology standardized by the Third Generation Partnership Project (3GPP). LTE uses orthogonal frequency division multiplexing (OFDM) technology for downlink. OFDM technology is a technology that uses multicarrier and bring the data in parallel and the bandwidth is divided into several subcarrier. To improve the performance of LTE in an increase in capacity, coverage, and speed of data, then it can use MIMO techniques. MIMO is a technique using multiple antenna transmitter and receiver antennas that are used to overcome the problem of multipath fading and increase the capacity of the system to be serviced. MIMO support the achievement of high transmission speed. In the simulation, signals generated by the modified jakes model into a ricean channel using the K factor 1.41, 1.99, 2.33, 2.66, 4.61, 6.35, 9.21, 12.15, 16.77 dB with elevation angle of 1 0 ° to 90°. The larger the K factor, the smaller the shift doppler at each speed. Elevation angle have a relationship to the coverage area of HAPs, the smaller the elevation angle of the wider the coverage area, and the higher the position, the wider HAPs coverage area too. In ergodic capacity, the smaller the K factor, the smaller the elevation angle so that the capacity is also greater. System without estimation for the K factor o f 1.41dB and K 9.21dB is necessary for channel estimation and the Bit Error Rate (BER) o f the same system that made channel estimation has a better performance compared with the existing channel without estimation with the SNR improvement o f about 18 dB.
Highlights
orthogonalfrequency division multiplexing (OFDM) technology is a technology that uses multicarrier and bring the data in parallel and the bandwidth is divided into several subcarrier
The development o f technology has opened up a new wireless infrastructure to complement the satellite and terrestrial networks
High Altitude Platforms (HAPs) can be joined with a Long Term Evolution (LTE) technology standardized by the Third Generation Partnership Project (3GPP)
Summary
Pada perkembangan komunikasi wireless untuk menyediakan layanan data yang berkecepatan tinggi (high data rate) dan bandwidth yang lebar merupakan sebuah tantangan. Selain operasi bandwidth yang fleksibel, LTE mendukung peningkatan kapasitas, area cakupan, kecepatan data, latency yang rendah, multi antena, dan dapat diintegrasikan dengan sistem lain (Waluyo dan Iskandar, 2015 ; Zarrinkoub,2014; Ayadi et al,2002). Untuk meningkatkan performansi LTE dalam peningkatan kapasitas, area cakupan dan kecepatan data, maka dapat menggunakan teknik multi antena baik di penerima maupun pengirim atau sering disebut multiple input multiple output (MIMO) (Zarrinkoub, 2014; Khalifi dan Bouallegue, 2011 ). Sehingga untuk menggabungkan kelebihan dari sistem komunikasi LTE dan HAPs maka pada penelitian ini menganalisa performansi dari kanal HAPs dan kapasitas berdasarkan faktor K yang sudah dilakukan pengukuran oleh Iskandar and Shimamoto (2005) dengan metode Multi antena atau Multi Input Multi Output (MIMO). Dengan melihat hubungan K sebagai perbandingan daya LOS dan daya scattering serta sudut elevasi pada frekuensi 2.4 GHz yang sudah dilakukan pengukuran oleh (Iskandar dan Shimamoto,2005) maka dapat disajikan dalam bentuk tabel 2.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
