Evaluation of correlation properties of Orthogonal spreading codes for CDMA wireless mobile communication

Kedia, Deepak; Duhan, Manoj; Maskara, S.L.

doi:10.1109/iadcc.2010.5422934

Cited by 15 publications

(11 citation statements)

References 10 publications

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“…Keterbatasan dari kinerja teknologi CDMA adalah adanya multiple access interference (MAI) yang disebabkan oleh korelasi silang antara kode spreading yang ditetapkan pada setiap user-nya [4]. Oleh karena itu dalam meminimalisir interferensi diperlukan adanya kode spreading dengan spesifikasi memiliki nilai cross-correlation (korelasi silang) yang sangat rendah agar setiap usernya dapat dibedakan [5]. Salah satu kategori spreading code yang memenuhi kriteria yang dibutuhkan dalam kode spreading CDMA adalah deretan kode orthogonal.…”

Section: Pendahuluanunclassified

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Unjuk Kerja Kode Orthogonal M-Sequence Dalam Sistem Direct Sequence Spread Spectrum Melalui Kanal Multipath Fa

Adnyana¹,

Pramaita²,

Widyantara³

2022

SPEKTRUM

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Multipath and multi-user interference are the main challenges in wireless communication systems. This has become a driving force for the development of data transmission technology that is focused to overcome these problems, one of which is spread spectrum. Spread spectrum is applied to CDMA technology which has the limitations of MAI, so a spreading code is required with specifications that have a very low cross-correlation value as in the orthogonal m-sequence code. In this study, simulate the orthogonal m-sequence code with a length of 8 chips on a multipath fading channel using the Direct Sequence Spread Spectrum system with aims of assessing the performance of the orthogonal m-sequence code on a multipath fading channel, based on the effect of changes in the number of multipath components. The research method used is a Monte Carlo simulation on simulink with the output data in the form of a graph of the comparison value of BER with Eb/No. The results show that on the flat fading channel with the number of components multipath 1, the BER value of the simulation results is in accordance with the BER theory so that the simulation is valid and can be applied to frequency selective fading channels. In the frequency selective fading channel with the number of multipath components 4,6, and 8, the best performance was shown in the multipath 4 component with the smallest BER value, this was influenced by the ACF and CCF values so that the multipath 4 component had the lowest ISI and interference between users.

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Section: Pendahuluanunclassified

“…Pada pergeseran nol, nilai autocorrelation kode akan memiliki nilai maksimum karena dihasilkan dari korelasi antara kode dengan salinannya sendiri yang memiliki struktur chip yang sama. Autocorrelation function (ACF) merupakan nilai-nilai autocorrelation yang diperoleh pada pergeseran ke kiri maupun ke kanan yang diplot ke dalam grafik [5][11].…”

Section: Autocorrelationunclassified

Unjuk Kerja Kode Orthogonal M-Sequence Dalam Sistem Direct Sequence Spread Spectrum Melalui Kanal Multipath Fa

Adnyana¹,

Pramaita²,

Widyantara³

2022

SPEKTRUM

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“…15 A family of spreading sequences whose mutual CCFs are zero for any time shift is known as a family of orthogonal sequences. 16 We can give as examples, Walsh-Hadamard sequences, 17 orthogonal Gold sequences, and orthogonal variable spreading factor (OVSF) sequences. 16,18 Orthogonal sequences have been firstly introduced for 3G communication systems, such as UMTS-UTRA, 19 W-CDMA, 20 and TD-SCDMA.…”

Section: Introductionmentioning

confidence: 99%

Efficient method for constructing optimized long binary spreading sequences

Boukerma

Rouabah

Mezaache

et al. 2021

Int J Communication

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In this paper, we propose an efficient method for generating two types of novel optimized long binary spreading sequences (OLBSS) with improved autocorrelation function (ACF) properties. The first type is constructed from concatenated short binary subsequences belonging to the same code family, such as Walsh Hadamard and Gold subsequences, provided that their crosscorrelation functions (CCFs) have good properties. The second category uses the same subsequences but which are rather interlaced. Here, the number and size of the subsequences are related to the chosen length of the final constructed long sequence and the desired performances. The realization of the OLBSSs is achieved using two different optimization techniques, namely, the genetic algorithms (GAs) and particle swarm optimization (PSO) method. The simulation results, based on MATLAB tool, have shown that the proposed long sequences, composed of Walsh-Hadamard subsequences and optimized by the GA, have better ACF properties compared to the original Gold, Weil, and random sequences of the same length.

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“…Code properties are known to be a cause of multiple-access interference (MAI), an important limiting factor on the system performance. The significance of spreading codes has made the search for better codes [1][2][3][4][5][6][7][8][9][10][11][12] and the mitigation of multiple-access interference [13][14][15][16][17][18][19][20][21][22][23] important areas of research.…”

Section: Introductionmentioning

confidence: 99%

Performance of even- and odd-degree Gold codes in a multi-user spread-spectrum system

Wojuola

Mneney

2014

2014 4th International Conference on Wireless Communications, Vehicular Technology, Information Theory and Aerospace &Amp; Elec

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Properties of spreading codes set bounds on the capability of a spread-spectrum system. In this paper, we investigate the performance of even-and odd-degree Gold codes in a multi-user code-division multiple-access system. Simulation results show that the odd-degree Gold codes give better bit-errorrate performance than the even-degree Gold codes. Whereas the odd-degree codes exhibited relatively marginal loss in performance when the system was loaded, their even-degree counterparts degraded rapidly in performance, resulting in early emergence of an error floor, culminating in premature system saturation. The results show that the odd-degree Gold codes have better properties that make them more suitable for multiple-access applications.

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Evaluation of correlation properties of Orthogonal spreading codes for CDMA wireless mobile communication

Cited by 15 publications

References 10 publications

Unjuk Kerja Kode Orthogonal M-Sequence Dalam Sistem Direct Sequence Spread Spectrum Melalui Kanal Multipath Fa

Unjuk Kerja Kode Orthogonal M-Sequence Dalam Sistem Direct Sequence Spread Spectrum Melalui Kanal Multipath Fa

Efficient method for constructing optimized long binary spreading sequences

Performance of even- and odd-degree Gold codes in a multi-user spread-spectrum system

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