Sistem komunikasi antara MS (Mobile Station) dan RBS (Radio Base Station) dengan frekuensi 2.3 GHz kondisi uplink, komunikasi yang terjadi ketika pengguna MS yang bergerak disepanjang trotoar terhadap RBS yang berada di tepi bagian atas gedung. Propagasi melewati pepohonan yang berada diantara kedua ruas jalan dan juga berada disepanjang trotoar, sehingga metode difraksi menggunakan single knife-edge dan Giovanelli knife-edge. Pada penelitian ini berfokus pada variasi ketinggian gedung dan daya pancar. Analisa ditunjukkan pada persentase daerah cakupan disepanjang lintasan MS. Persentase tersebut terjadi peningkatan dengan variasi daya pancar 20 dBm hingga 40 dBm yang diikuti peningkatan ketinggian gedung. Hasil penelitian, menunjukkan beberapa titik pada lintasan yang memiliki loss yang sangat besar, menjadikan sedikit peningkatan persentase daerah tercakup RBS. Pengaruh dari komunikasi tersebut diantaranya karena pepohonan, atmosfer, dan juga jarak komunikasi
Abstrak -Penelitian ini menjelaskan tentang sistem komunikasi radio base station femtocell yang diletakkan pada tiang lampu jalan. Frekuensi yang digunakan 47 GHz. Analisis pada penelitian ini terdiri dari variasi daya transmitter, dan variasi code rate dari signal-to-interference-plus-noise-ratio threshold 16 QAM. Daya transmitter yang digunakan 10 mW hingga 200 mW. Variasi code rate dari signal-to-interference-plus-noiseratio threshold 16 QAM terdiri dari 1/2, 2/3, 3/4, dan 4/5. Sebagai hasil ditunjukkan hubungan antara daya transmitter dan code rate, dan hubungan antara persentase daerah tercakup pada lintasan mobile station dan code rate. Berdasarkan hubungan antara persentase daerah tercakup and code rate didapatkan semakin meningkat nilai code rate maka nilai persentase pada daerah tercakup semakin berkurang.Kata kunci -47 GHz, 16 QAM, femtocell, tiang lampu jalan Abstract -This research describes about the communication systems at radio base station femtocell that placed at street lamp. The frequency that used was 47 GHz. The analysis in this research consists of transmitter power variation, and code rate variation from signal-to-interference-plus-noise-ratio threshold 16 QAM. The transmitter power that used was 10 mW until 200 mW. The code rate variation from signal-to-interference-plus-noise-ratio with threshold 16 QAM consists of 1/2, 2/3, 3/4, and 4/5. As the result showed relation between transmitter power and code rate, and relation between coverage area percentages at mobile station track and code rate. Based on the relation between coverage area percentages and code rate obtained the value of code rate increased then the percentage value of coverage area decreased. [6]. Pemanfaatan frekuensi tinggi dapat dipengaruhi oleh pengaruh redaman pada atmosfer [7]. Redaman pada atmosfer diantaranya dipengaruhi oleh uap air dan oksigen.Tiang lampu jalan merupakan salah satu penyangga untuk penerangan yang sering terlihat di jalan. Ketinggian tiang tersebut bervariasi, tergantung dari lebar jalan yang digunakan, dan intensitas cahaya. Variasi ketinggian lampu jalan di Indonesia disesuaikan dengan Standar Nasional Indonesia (SNI), tentang spesifikasi penerangan jalan di kawasan perkotaan [8]. Beberapa standar yang
This paper focused at communication system with multipath effects at building environment. The frequency that used for the communication system was 47 GHz. That frequency possibly used for higher bandwidth at communication system. The condition of communication propagation that used was downlink direction. Mobile station placed at track or street with buildings environment condition. This research analysis was based on transmitter power variation, bandwidth variation, and modulation threshold variation. That analysis produced signal to noise ratio value that was obtained from bandwidth variation and transmitter power variation. The transmitter power variation that used was consists of 0.01 Watt, 0.1 Watt, and 1 Watt. Threshold variations for communication modulation that used was consist of 16 QAM and 64 QAM. As the result such as bandwidth variation showed widened of bandwidth then more decreasing of signal to noise ration value, and more increasing of transmitter power then also more increase of signal to noise ratio value
This research discusses the determination of mobile station (MS) location of the uplink communication system. The location determination mobile station is based on the angle-of-arrival (AoA) method. The communication propagation is influenced by building environment. The building environment was modeled with diffraction method. Several diffraction methods were used such as single knife edge, and multiple knife edge method. The communication frequency used was 47 GHz. The analysis used percentage value at coverage area and comparison of error percent values between two method to determine mobile station location. The percentage of the communication coverage area obtained was 71.4% or of 255 from 300 nodes. The comparison methods used for mobile station location determination were the selection of the best SNR and localization technique. The error percentage value based on the selection of the best SNR method is 0.95%. The error percentage value based on localization technique method is 0.78%.
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