The Impact of Beamforming, Power Control, and Sectorization on CDMA Capacity
Linna Oktaviana, Sari Jurusan, Elektro Fakultas Teknik
unpublished
Abstrak Kapasitas CDMA dibatasi oleh interferensi dan dapat dioptimalkan dengan menekan interferensi sehingga memenuhi kebutuhan layanan multiclass. Pada penelitian ini, dianalisa pengaruh penggunaan antena beamforming, pengendalian daya tak sempurna dan sektorisasi tak sempurna pada kapasitas user dari sistem CDMA reverse-link berdasarkan signal to interference ratio (SIR) pada pengirim mobile station (MS) dan penerima base station (BS). Beamforming digunakan dengan asumsi setiap elemen
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... i amplitudo arus identik dan jarak antar elemen yang sama. Sistem CDMA yang diteliti berbentuk sel makro heksagonal yang terdapat pada homecell-BS dan dibagi kedalam 3 sektor dengan beamwidth 120 o. Kapasitas user dipengaruhi oleh faktor pengendalian daya, jumlah elemen antena beamforming, jumlah sektor, besar sudut overlap akibat sektorisasi tidak sempurna, dan pengendalian daya tak sempurna, SIR dan processing gain CDMA. Hasil Penelitian menunjukkan bahwa Pengendalian daya dan Sektorisasi dengan antena beamforming menghasilkan kapasitas sistem multiclass CDMA lebih besar dibandingkan tanpa antena beamforming. Kata Kunci : Beamforming, Pengendalian daya, sektorisasi, Multiclass, CDMA. Abstract Capacity of CDMA was limited by interferences and could be optimalyzed by reduce interferences to fulfill requirements of multiclass services. In this research, the impact of imperfect power control and imperfect sectorization to reverse-link user capacity of CDMA system based on signal to interference ratio (SIR) by using beamforming at mobile station transmitter and base station receiver have been analyzed. Beamforming would be used with assumed each element has uniformly excited, equally spaced linear array. CDMA system use hexagonal macro cell in home cell base station, which divided effectively into 3 sectors with 120 o beam width. User capacities was influenced by power control factor, number of antenna beamforming elements and sectors, overlap angle due to imperfect sectorization, imperfect power control, SIR and processing gain CDMA. Results of this research indicate that the system with power control and sectorization using beamforming has larger capacity of multiclass system than without beamforming.
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