WCDMA Research Papers - Academia.edu (original) (raw)

Mobile operators currently prefer optimizing their radio networks via re-homing or cutting over the cell sites in 2G or 3G networks. The core network, as the parental part of radio network, is inevitably impacted by the re-homing in radio... more

Mobile operators currently prefer optimizing their radio networks via re-homing or cutting over the cell sites in 2G
or 3G networks. The core network, as the parental part of radio network, is inevitably impacted by the re-homing in radio domain. This paper introduces the cell site re-homing in radio network and analyzes its impact on the performance of GSM/UMTS core network. The possible re-homing models are created and analyzed for core networks. The paper concludes that appropriate re-homing in radio domain, using correct algorithms, not only optimizes the radio network but also helps improve the QoS of the core network and saves the carriers’ OPEX and CAPEX on their core networks

Teknologi WCDMA menggunakan 1 kanal frekuensi yang digunakan secara bersama-sama yang masing-masing pengguna diberikan kode untuk membedakan satu pengguna dengan lainnya. Ada beberapa hal yang dapat dilakukan untuk mengamati performansi... more

Teknologi WCDMA menggunakan 1 kanal frekuensi yang digunakan secara bersama-sama yang masing-masing pengguna diberikan kode untuk membedakan satu pengguna dengan lainnya. Ada beberapa hal yang dapat dilakukan untuk mengamati performansi jaringan WCDMA, mulai dari masukan dan keluhan pelanggan, mengamati alarm sistem yang ada, melakukan drive test, hingga analisa terhadap trafik jaringan.
Parameter KPI hasil pengolahan yang digunakan untuk Implementasi antara lain RRC Attempt, RRC Failure, Call Setup Attempt, Call Setup Failure, HSDPA Setup Attempt, HSDPA Setup Failure, Call PS R.99 Drop, HSDPA Drop, Handover, dan Throughput. Parameter diatas menjadi dasar untuk penghitungan KPI Accessibility, Retainability, Integrity dan Mobility.
Accessibility, Jaringan 3G Data Cluster Balikpapan 1, Balikpapan 2 dan Balikpapan 3 masih dibawah standar KPI sedangkan Retainability dan Integrity Jaringan 3G Data Cluster Balikpapan 1, Balikpapan 2 dan Balikpapan 3 diatas standar KPI

Perkembangan teknologi mobile broadband saat ini mengalami kemajuan yang pesat sesuai dengan kebutuhan manusia akan informasi. Teknologi High Speed Downlink Packet Access (HSDPA) yang merupakan perkembangan dari teknologi WCDMA merupakan... more

Perkembangan teknologi mobile broadband saat ini mengalami kemajuan yang pesat sesuai dengan
kebutuhan manusia akan informasi. Teknologi High Speed Downlink Packet Access (HSDPA) yang merupakan
perkembangan dari teknologi WCDMA merupakan alternatif untuk layanan internet kecepatan tinggi sampai
dengan 7,2 Mbps. Dengan berkembangnya jumlah pelanggan maka kualitas jaringan harus selalu ditingkatkan
baik jaringan luar ruangan atau dalam ruangan. Untuk mengetahui kualitas suatu jaringan seluler dapat
menggunakan metode drive test dengan melihat parameter-parameter nilai sinyal Received Signal Code Power
(RSCP), Energy Chips per Noise (Ec/No). Untuk mengetahui kualitas layanan data maka dapat dilihat dari nilai
troughput kecepatan maksimum dari hasil upload dan download. Hasil penelitian dan pengukuran menunjukan
nilai sinyal yang diperoleh untuk operator Telkomsel dan Axis nilai terbaik untuk RSCP ≥ -92 dBm yaitu dapat
mencapai target yaitu sebanyak lebih hari 80% , dan untuk Ec/No ≥ -9 dBm belum mencapai target 80%,
sedangkan untuk nilai troughput maksimal operator telkomsel dan Axis dapat mencapai target 1,9 dan 1,7
Mbps untuk download dan untuk upload operator telkomsel dan Axis sebesar 407 dan 403 kbps.

Diktat Kuliah Mata Kuliah Teknik Seluler

Performance analysis of umts network is of major interest, because of the WCDMA technique used in umts, which leads to an interference limited system with a dynamic cell capacity and load dependent cell coverage. The performance of umts... more

Performance analysis of umts network is of major interest, because of the WCDMA technique used in umts, which leads to an interference limited system with a dynamic cell capacity and load dependent cell coverage. The performance of umts network depends on sectorization; also, the coverage area depends significantly on the geografical nature and the propagatoin environment of the covered area. In this paper, the capacity and coverage of umts cellular network covering a densed urban area and suburban area are simulated for incrising amount of sectorization showing the number of users and coverage area gradually increased. For modelling the propagatoin, the cost-231 hata model has been used.

In this paper, an analysis of the crest factor reduction effects' on the predistortion performance of 3G multi-carrier power amplifiers is carried out. This study is performed at three different levels: the power amplifier level, the... more

In this paper, an analysis of the crest factor reduction effects' on the predistortion performance of 3G multi-carrier power amplifiers is carried out. This study is performed at three different levels: the power amplifier level, the digital predistorter level, and the system level (linearized amplifier) for a Doherty amplifier driven by 3-carrier WCDMA signal. At the amplifier level, the use of crest factor reduction results in higher power efficiency, increased output power but also distortions. Experimental results show that this compromises the performance of the digital predistorter. The system level analysis highlighted that, in such case, the gained efficiency at the amplifier level will be lost after linearization. This is the first study that points out and experimentally reports the drawbacks of crest factor reduction when applied to digitally predistorted multi-carrier power amplifiers.

This article presents a survey on medium access control protocols for wireless multimedia networks. A basic overview of MAC protocol concepts is presented, and a framework is developed for comparisons. The MAC protocols covered in this... more

This article presents a survey on medium access control protocols for wireless multimedia networks. A basic overview of MAC protocol concepts is presented, and a framework is developed for comparisons. The MAC protocols covered in this article include Random Access protocols, Contention less protocols, TDMA CDMA, third-generation WCDMA schemes and Hybrid protocols proposed for wireless Multimedia Networks. The operation of each protocol is explained, and its advantages and disadvantages are presented. Finally, a qualitative comparative outline of the discussed protocols is provided.

Operator telepon seluler saat ini memisahkan pemakaian antena 2G (GSM) Dual Band dan antena 3G (WCDMA) yang ditempatkan pada site yang sama. Hal ini jelas tidak ekonomis karena harus membangun sistem kabel feeder dan antena terpisah dari... more

Operator telepon seluler saat ini memisahkan pemakaian antena 2G (GSM) Dual Band dan
antena 3G (WCDMA) yang ditempatkan pada site yang sama. Hal ini jelas tidak ekonomis
karena harus membangun sistem kabel feeder dan antena terpisah dari dua sistem tersebut.
Walaupun menggunakan tower yang sama, investasi yang dibutuhkan tetap besar. Dalam
studi ini akan dibahas penggunaan antena Triple Band yang digunakan secara bersama
antara sistem 2G dan 3G pada suatu site guna menekan biaya investasi pembangunan tower
kedua sistem tersebut. Antena Triple Band adalah antena yang range frekuensinya antara
800 MHz – 2200 MHz (Kathrein, 2006). Dari range frekuensinya ini antena Triple Band
dapat bekerja pada sistem 2G maupun 3G. Membangun sistem 3G yang ditempatkan pada
suatu site yang sama dengan sistem 2G dengan memanfaatkan antena Triple Band, maka
pelanggan yang menggunakan sistem 2G maupun sistem 3G pada area tersebut dapat
dilayani sekaligus dengan satu antena tersebut. Bila operator ingin menambahkan sistem 3G
pada suatu site/tower BTS 2G, maka operator tidak perlu lagi membangun antena 3G, karena
harus memasang line kabel feeder baru dan memasang antena 3G. Dengan menggunakan
antena Triple Band, cukup menggantikan antena GSM yang ada pada site/tower tersebut
dengan antena Triple Band kemudian mengkonekneksikan RBS 2G yang telah ada
sebelumnya dengan RBS 3G yang baru dipasang dengan menggunakan line kabel feeder yang
sebelumnya untuk antena GSM. Bila satu RBS 2G dan RBS 3G dibangun secara terpisah
pada suatu site, setiap sistem tersebut optimal masing-masing memerlukan 3 antena. Maka
untuk satu site/tower diperlukan minimal 6 antena. Dengan menggunakan antena Triple Band
kedua sistem tersebut akan diintegrasikan pada antena yang sama. Sehingga pada satu
site/tower antena yang diperlukan untuk kedua sistem tersebut adalah 3 antena.

This paper reports on a 40 W high linearity InGaP/ GaAs 28 V HBT. It uses a high breakdown voltage, high ruggedness HBT process developed by WJ. The device employs a dynamic bias circuit to improve ACLR under WCDMA modulation conditions.... more

This paper reports on a 40 W high linearity InGaP/ GaAs 28 V HBT. It uses a high breakdown voltage, high ruggedness HBT process developed by WJ. The device employs a dynamic bias circuit to improve ACLR under WCDMA modulation conditions. The P-1 dB of the device reaches 46 dBm (40W), with a gain around 14.5 dB. With WCDMA one carrier modulation (PAR=8.5 dBc), the device achieves an ACLR of -50 dBC and an efficiency of 19.5% at an output power of 37.5 dBm (5.6 W) at 920-960 MHz frequency band. Without the help of a DPD, the performance of this device will make it an excellent choice for base station and repeater applications.

High date rates of up to 5.76 Mbps with spreading factors as low as 2 are supported in high speed uplink packet access (HSUPA) channels of UMTS, as specified by 3GPP. Receivers for WCDMA are usually implemented as Rake receivers or... more

High date rates of up to 5.76 Mbps with spreading factors as low as 2 are supported in high speed uplink packet access (HSUPA) channels of UMTS, as specified by 3GPP. Receivers for WCDMA are usually implemented as Rake receivers or variants of it. Such receivers require accurate estimation of complex gains of multipaths received. Pilot symbols are provided as part of DPCCH channel and can be used for pilot-aided estimation of multipath complex gains. However the pilot symbols are in time-multiplexed form i.e. not transmitted continuously in time. Also, for channels corresponding to high vehicular speeds, the coherence time of channel is very low. Hence the accurate estimation of channel taps with granularity as fine as 2 chips becomes a complex task. We present here a method of channel estimation based on interference-compensated cubic smoothing splines. This method has been found to be robust to additive noise, while at the same time able to closely track the channel variations with fine granularity. The smoothing splines are a variant of least-squares splines, but with added constraints on smoothness. A comparison of the proposed method with alternative methods of channel estimation is also presented.

Tulisan ini membahas tentang tinjauan pemanfaatan teknologi seluler diaplikasikan sebagai passive radar untuk mendeteksi pesawat terbang. Sesuai dengan fungsinya, maka pemodelan ini memerlukan beberapa asumsi dasar antara lain model... more

Tulisan ini membahas tentang tinjauan pemanfaatan teknologi seluler diaplikasikan sebagai passive radar untuk mendeteksi pesawat terbang. Sesuai dengan fungsinya, maka pemodelan ini memerlukan beberapa asumsi dasar
antara lain model propagasi “Llyods mirror” dihitung, dan model propagasi yang digunakan adalah propagasi sinyal di ruang bebas. Selanjutnya dibahas penggunaan sinyal pilot pada WCDMA untuk cellular radar. Cellular radar ini bekerja berdasar gabungan antara prinsip radar konvensional dengan deteksi oleh cellular yang memanfaatkan proses sinkronisasi pararel sinyal PN. Dengan skema ini proses deteksi akan mencari nilai terbesar dari autokorelasi antara urutan PN dengan nomor path

It is a handbook of WCDMA mobile measurements in Air/Uu interface. For FDD and Non-HSPA This document is originally edited by Justin MA and it is free to share to everyone who are interested. All reference/resource are from... more

In this paper, we investigate a comprehensive study on a simulated cooperative wireless communication system with implementation of code division multiple access (CDMA) technique under Decode-and-Forward (DAF) and Amplify-and- Forward... more

In this paper, we investigate a comprehensive study on a simulated cooperative wireless communication system with implementation of code division multiple access (CDMA) technique under Decode-and-Forward (DAF) and Amplify-and- Forward (AAF) relaying protocols. The system under investigation incorporates two digital modulations (BPSK and QPSK) with five major types of signal combining schemes as Equal Ratio Combining (ERC), Fixed Ratio Combining (FRC), Signal-to-Noise Ratio Combining (SNRC), Maximum Ratio Combining (MRC) and Enhanced Signal-to-Noise Combining (ESNRC). Results of BER simulation in AWGN and Raleigh fading channels show that the system provides better performance in AAF relaying protocol as compared to DAF whatever the signal combining scheme is used. In DAF relaying protocol, the system shows most satisfactory performance in SNRC and QPSK digital modulation in comparison with worst case in ERC. In AAF relaying protocol, a much better system performance is achieved in FRC and QPSK digital modulation as finding worst performance in ERC. Information about the average quality shows performance benefits, and a rough approximation about the variation of the channel quality increases the performance even more. The best system performance is achieved when the relay is at equal distance from the sender and the destination or slightly closer to the former.