Computationally-Efficient SNR Estimation for Bandlimited Wideband CDMA Systems

Jatunov, Loran Aleksandrovich; Madisetti, Vijay K.

doi:10.1109/twc.2006.256971

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…Contoh sifat destruktif yang sering terjadi yakni seperti fading dan delay [4][5]. Penurunan dan fluktuasi daya sinyal pada sisi penerima disebut dengan fading dan variasi waktu yang diakibatkan oleh jarak dan perambatan gelombang dari pemancar ke penerima disebut dengan delay [6][7][8]. Salah satu jenis fading yang memiliki fluktuasi redaman propagasi pada daerah sempit dan interval waktu singkat yakni small-scale fading [9][10].…”

Section: Pendahuluanunclassified

Desain Program Simulasi Unjuk Kerja Kode Pn Pada Kanal Multipath Fading

Pratama

Pramaita

Wirastuti

et al. 2020

MATRIX

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Halangan pada Line of Sight (LOS) dapat menyebabkan difraksi (pembelokan), refleksi (pemantulan), dan scattering (penghamburan) pada sinyal informasi dimana akan mengurangi kualitas sinyal informasi yang diterima pada sisi penerima. Hal tersebut mengakibatkan adanya sifat konstruktif maupun destruktif pada sinyal di sisi penerima. Contoh sifat destruktif yang sering terjadi yakni fading dan delay. Sistem penerima correlation receiver diimplementasikan guna mengatasi masalah yang timbul akibat efek dari multipath fading. Untuk memperoleh sinyal dengan nilai error minimum, maka diperlukan analisis terkait proses transmisi pada masingmasing komponen multipath. Hasil analisis diperoleh bahwa unjuk kerja dari Kode PN (Pseudo Noise) pada kanal frequency selective fading yang lebih baik adalah variasi komponen multipath = 3 dibandingkan dengan variasi komponen multipath = 6 dan yang paling buruk adalah variasi komponen multipath = 7. Hal ini dibuktikan dengan melihat nilai Bit Error Rate (BER) saat Energy Per Bit To Noise Power Spectral Density Ratio (Eb/No) = 10 dengan komponen multipath = 3 memiliki nilai BER 0,00368, sedangkan komponen multipath = 6 dan komponen multipath = 7 memiliki nilai BER berturutturut adalah 0,00386 dan 0,00507. Berdasarkan hasil analisis tersebut dapat diambil simpulan bahwa jumlah komponen multipath yang ada berpengaruh terhadap kualitas sinyal yang diterima.

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Section: Pendahuluanunclassified

Desain Program Simulasi Unjuk Kerja Kode Pn Pada Kanal Multipath Fading

Pratama

Pramaita

Wirastuti

et al. 2020

MATRIX

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“…sel. Jika dilihat dari sisi user yang diinginkan, komponen sinyal yang ditujukan untuk user yang lain akan menkontribusikan noise, yang dikenal dengan multiple access interference (MAI) [4], [5]. MAI ini muncul akibat adanya cross-correlation diantara kode spreading yang dipakai oleh user, yang akan membatasi unjuk kerja sistem CDMA pada kondisi kanal yang dibatasi MAI [6].…”

Section: Pendahuluanunclassified

Unjuk Kerja Kode Hybrid Orthogonal Small Set

Pramaita

2016

MITE

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“…In the downlink of CDMA mobile network, a signal coming from a base station has a component intended for a desired user and components intended for other users in the same cell using the same frequency. From the perspective of the desired user, the components intended for other users are known as multiple access interference (MAI) [4], [5]. The performance of CDMA based wireless system is mainly limited by multiple access interference (MAI) arising due to crosscorrelation between the spreading sequences assigned to different users under multiple access interference limited channel conditions [6].…”

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confidence: 99%

Novel Hybrid Orthogonal Large Set Code Sequence for High Density Wireless Networks

Pramaita

Johnson

2014

IJPS

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AbstractCDMA technique has been successfully employed to implement high capacity mobile networks with optimum channel bandwidth utilization. The two most coveted criteria for the spreading codes used in such network are, the number of codes in the set and the code orthogonality, in order to ensure accommodation of large number of users and as well as minimal interference between the users. Walsh code has proved to be a popular orthogonal code, whereas m-sequence, Gold code and Kasami code have established themselves as popular non-orthogonal binary codes. Small set Orthogonal Kasami code has been proposed and evaluated by researchers for CDMA applications. In this paper the authors report the design of hybrid orthogonal large set (HOLS) code for synchronous CDMA systems. The HOLS code was evaluated in a synchronous CDMA system over different channel conditions. The authors also demonstrate that the BER performance of the HOLS code is comparable to that of the existing orthogonal codes, but outperforms Gold and large set Kasami code sequences. The HOLS code sequence is also shown to outperform the existing code sequences in the number of cells it can support. In terms of multiple access interference (MAI), the cross-correlation function (CCF) of the HOLS code sequence is comparable to that of Walsh and orthogonal small set Kasami codes, and much better than those of Gold and large set Kasami code sequences. HOLS code sequence has comparable auto-correlation function (ACF) with that of Gold, large set Kasami and orthogonal small set Kasami code sequences and a much better ACF than that of Walsh code sequence.

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Computationally-Efficient SNR Estimation for Bandlimited Wideband CDMA Systems

Cited by 5 publications

References 20 publications

Desain Program Simulasi Unjuk Kerja Kode Pn Pada Kanal Multipath Fading

Desain Program Simulasi Unjuk Kerja Kode Pn Pada Kanal Multipath Fading

Unjuk Kerja Kode Hybrid Orthogonal Small Set

Novel Hybrid Orthogonal Large Set Code Sequence for High Density Wireless Networks

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