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"The simplest model that is frequently used for a transmission channel is the additive white Gaussian noise (AWGN) channel model. In this model the received signal is the sum of the transmitted signal and Gaussian noise. The simple channel model has great theoretical and practical importance and is an accurate model for many communication channels, such as satellite and deep space communication channels. In many communication systems, however, the channels are subject to various impairments in addition to the additive noise. For these channels the simple model of AWGN is no longer valid and one must consider more practical and complex channel models. One of the such channel types which frequently occur in radio communication is the fading channel.In mobile radio communication system, the propagation between a base and a mobile station is not only by a direct line-of-sight path, but via many paths. These propagation paths depend largely on the. scattered reflection from many obstacles near the base and mobile stations. The received signal, at any place, consist of a large number of waves arriving from many directions. These multipath waves interfere and produce a varying field strength. The base station receiver experience similar fading as the mobile transmitter moves. The signal fluctuation rate is proportional to the vehicle speed. In many fading channels, in addition to the diffused multipath fading, there exists a dominant line-of-sight (direct) signal component. Denoting the direct component by Acos(2πfct), the received signal then can be written as r(t)= (A + a1 (t)) cos(2πfct) + aQ sin(2πfct)"

"Trellis coded modulation (TCM) formats with their excellent bandwidth and power efficiency have been widely employed in various communication systems. For mobile satellite communications, trellis coded (TC) M-ary phase shift keying (MPSK) is the primary candidate modulation technique. In the first generation mobile satellite systems, co-channel interference (CCI) does not pose a serious problem. However, second generation systems are expected to reuse frequency to increase the orbit slot spectral efficiency. Then the CCI from adjacent beams and adjacent satellite will be dominant factor determining the system performance and overall capacity. Mobile satellite communication is also suffered from strong variations of the received signal power due to the multipath fading. Typically, mobile satellite channels are modeled as Rician or Nakagami fading; that is the received signal consists of a constant line of sight signal component and a Rayleigh distributed diffuse signal component. Therefore, the performance of system on mobile satellite channels is subject to both fading and CCI.TCM and antenna diversity are two attractive methods to combat fading and CC1 effects in the mobile satellite communication systems. The research focuses on the using of TCM and antenna diversity to combat the fading and CCI effects on mobile satellite system, and analyze their performance characterized by bit error rate (BER). Because of multipath propagation , the mobile satellite communication channel is modeled as a Rician or Nakagami fading channel. This report, the BER performance of TC asymmetric MPSK with CCI and TC asymmetric MPSK with diversity on mobile satellite communication systems will be investigated and analyzed.First, the BER performance of TC- asymmetric MPSK in the presence of undesired CCI with multiple interferers and fading channel is investigated. The fading statistic for desired signal is Nakagami fading and the undesired interference signals are Rayleigh fading. We assume that all the interferers are unmodulated because most of errors are produced by Rayleigh fading itself rather than the modulating sequence. This model assumes that all interfering signals have aligned symbol timing and no cross channel interference symbol interfering (ISi) effects. The desired signal is assumed to have Nakagami distribution implying that a dominant multipath exists in transmission. The desired and the interfering carrier have no phase coherence. We derive the BER performance of TC asymmetric MPSK in the presence CCI and fading channels by using the first error event method. It is shown that the BER performance of TC asymmetric MPSK in the presence of CCI is better than that of system with asymmetric MPSK. The BER performance of TC asymmetric MPSK is improved as increasing either the Nakagami fading parameter or the value of signal-to-interference ratio (SIR). As the Nakagami fading parameter is increased the phase signal of MPSK is also increased.Second, the BER performance of TC MPSK with 2 branch selection combining (SC) and maximal ratio combining (MRC) diversities on independent and spatially correlated Nakagami fading channel are investigated. The upper bound bounds using the transfer function bounding technique are derived and several numerical results are shown. Is shown that the BER performance of TC 8PSK with MRC diversity is better than that of system with SC diversity. Although the correlation between branches causes the signal-to-noise ratio (SNR) loss (relative to independent fading case) for SC and MRC diversities, the diversity can lead to achieve the diversity gain compared to the system without diversity.Third, the BER performance of TC 8PSK in the presence of undesired CCI with multiple interferers and fading channel is investigated by using computer simulation. The fading statistic for desired signal is Nakagami fading and the undesired interference signals are characterized by Rayleigh fading. The I3ER performance of TC 8PSK in the presence CC1 and fading channels is simulated by using the first error event method. It is shown from the result that the simulation result of the performance of TC 8PSK in the presence CCI and fading channels is closed to the analytical result."

"Perkembangan pesat aplikasi mobile telah menjadi bagian penting dalam mendukung berbagai aktivitas, termasuk di industri telekomunikasi. Perusahaan pada industri telekomunikasi di Indonesia sendiri memiliki tantangan dalam menjaga tingkat customer churn yang tinggi. Faktor utama penyebab tingginya customer churn pada industri telekomunikasi adalah rendahnya tingkat customer experience dan loyalitas pelanggan yang rendah. Meskipun berbagai fitur telah dihadirkan oleh aplikasi mobile telekomunikasi seperti MyTelkomsel sebagai upaya peningkatan customer experience dan loyalitas pelanggan, tingkat kehilangan pelanggan di industri ini masih tinggi, sehingga diperlukan pemahaman mendalam mengenai faktor-faktor kualitas layanan mobile. Penelitian ini bertujuan untuk menganalisis pengaruh mobile service quality terhadap continuance intention pengguna aplikasi MyTelkomsel, yaitu aplikasi mobile telekomunikasi dari provider seluler dengan jumlah pengguna terbanyak di Indonesia. Dalam meneliti hal tersebut, tim peneliti menggunakan SERVQUAL theory, konstruk inertia, dan continuance intention yang diadaptasi dari berbagai penelitian terdahulu. Pengumpulan data kuantitatif dilakukan melalui kuesioner yang diisi oleh 487 responden dan data kualitatif melalui wawancara dengan 30 narasumber. Data kuantitatif dianalisis menggunakan metode Partial Least Square structural Equation Modelling (PLS-SEM) melalui perangkat lunak SmartPLS 4, sementara data kualitatif menggunakan metode content analysis. Hasil penelitian ini menunjukkan bahwa mobile service quality yang terdiri dari dua dimensi, yaitu application quality dan outcome quality berpengaruh terhadap continuance intention. Hasil penelitian ini diharapkan dapat menjadi masukan bagi penyedia layanan telekomunikasi, terkhusus pihak pengembang, mengenai aspek mobile service quality pada aplikasi mobile telekomunikasi apa saja yang dapat dikembangkan untuk meningkatkan niat keberlanjutan penggunaanya.

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The rapid development of mobile applications has become an essential part of supporting various activities, including in the telecommunications industry. Companies in the Indonesian telecommunications industry face the challenge of maintaining high customer churn rates. The main factors causing high customer churn in the telecommunications industry are the low level of customer experience and low customer loyalty. Although various features have been introduced by mobile telecommunication applications like MyTelkomsel in an effort to improve customer experience and loyalty, the rate of customer loss in this industry remains high. Therefore, a deep understanding of the factors influencing the quality of mobile services is necessary. This study aims to analyze the impact of mobile service quality on the continuance intention of MyTelkomsel users, which is the mobile application of the largest cellular provider in Indonesia. To investigate this, the research team employs the SERVQUAL theory. constructs inertia, and continuance intention adapted from previous studies. Quantitative data was collected through a questionnaire completed by 487 respondents and qualitative data through interviews with 30 informants. The quantitative data was analyzed using the Partial Least Square Structural Equation Modelling (PLS-SEM) method through the SmartPLS 4 software, while the qualitative data was analyzed using content analysis. The results of this study indicate that mobile service quality, comprising two dimensions: application quality and outcome quality, affects continuance intention. These findings are expected to provide insights for telecommunications service providers, especially developers, on which aspects of mobile service quality in mobile applications can be enhanced to increase users' continuance intention."

"Perkembangan pesat aplikasi mobile telah menjadi bagian penting dalam mendukung berbagai aktivitas, termasuk di industri telekomunikasi. Perusahaan pada industri telekomunikasi di Indonesia sendiri memiliki tantangan dalam menjaga tingkat customer churn yang tinggi. Faktor utama penyebab tingginya customer churn pada industri telekomunikasi adalah rendahnya tingkat customer experience dan loyalitas pelanggan yang rendah. Meskipun berbagai fitur telah dihadirkan oleh aplikasi mobile telekomunikasi seperti MyTelkomsel sebagai upaya peningkatan customer experience dan loyalitas pelanggan, tingkat kehilangan pelanggan di industri ini masih tinggi, sehingga diperlukan pemahaman mendalam mengenai faktor-faktor kualitas layanan mobile. Penelitian ini bertujuan untuk menganalisis pengaruh mobile service quality terhadap continuance intention pengguna aplikasi MyTelkomsel, yaitu aplikasi mobile telekomunikasi dari provider seluler dengan jumlah pengguna terbanyak di Indonesia. Dalam meneliti hal tersebut, tim peneliti menggunakan SERVQUAL theory, konstruk inertia, dan continuance intention yang diadaptasi dari berbagai penelitian terdahulu. Pengumpulan data kuantitatif dilakukan melalui kuesioner yang diisi oleh 487 responden dan data kualitatif melalui wawancara dengan 30 narasumber. Data kuantitatif dianalisis menggunakan metode Partial Least Square structural Equation Modelling (PLS-SEM) melalui perangkat lunak SmartPLS 4, sementara data kualitatif menggunakan metode content analysis. Hasil penelitian ini menunjukkan bahwa mobile service quality yang terdiri dari dua dimensi, yaitu application quality dan outcome quality berpengaruh terhadap continuance intention. Hasil penelitian ini diharapkan dapat menjadi masukan bagi penyedia layanan telekomunikasi, terkhusus pihak pengembang, mengenai aspek mobile service quality pada aplikasi mobile telekomunikasi apa saja yang dapat dikembangkan untuk meningkatkan niat keberlanjutan penggunaanya.

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The rapid development of mobile applications has become an essential part of supporting various activities, including in the telecommunications industry. Companies in the Indonesian telecommunications industry face the challenge of maintaining high customer churn rates. The main factors causing high customer churn in the telecommunications industry are the low level of customer experience and low customer loyalty. Although various features have been introduced by mobile telecommunication applications like MyTelkomsel in an effort to improve customer experience and loyalty, the rate of customer loss in this industry remains high. Therefore, a deep understanding of the factors influencing the quality of mobile services is necessary. This study aims to analyze the impact of mobile service quality on the continuance intention of MyTelkomsel users, which is the mobile application of the largest cellular provider in Indonesia. To investigate this, the research team employs the SERVQUAL theory. constructs inertia, and continuance intention adapted from previous studies. Quantitative data was collected through a questionnaire completed by 487 respondents and qualitative data through interviews with 30 informants. The quantitative data was analyzed using the Partial Least Square Structural Equation Modelling (PLS-SEM) method through the SmartPLS 4 software, while the qualitative data was analyzed using content analysis. The results of this study indicate that mobile service quality, comprising two dimensions: application quality and outcome quality, affects continuance intention. These findings are expected to provide insights for telecommunications service providers, especially developers, on which aspects of mobile service quality in mobile applications can be enhanced to increase users' continuance intention."

""Information Revolution enables any organization, no matter how underdeveloped or convoluted its current information architecture, to become an information-driven "intelligent entity"--A survivor." "This utterly practical yet profoundly transformative guide introduces the Information Evolution Model (IEM), a simple but powerful framework for evaluating, configuring, and maximizing the information management infrastructure of any organization."--Jacket."

"The BER performance of trellis coded (TC) 8PSK with 2-branch selection (SC) and maximal ratio combining (MRC) diversities on mobile satellite communication system, which channel characterized by Nakagami fading channel is investigated. The special case of 2 branch SC and MRC diversities on independent and spatially correlated Nakagami fading are analyzed in detail, It is shown that the BER performance of TC 8PSK with diversity is better than that system without diversity, and the BER performance of system with diversity increases with increasing the Nakagami fading parameter m. Although the correlation between branches causes signal-to-noise ratio (SNR) loss relative to uncorrelated fading case for 2 branches SC and MRC diversities, the SC and MRC diversities can lead the diversity gain, that is, the improvement of BER performance of TC 8PSK with diversity is obtained over the TC 8PSK without diversity. In addition, the effect of antenna separation which causes cross correlation between the fading signals envelops on the performance of TC 8PSK with 2 branch SC and MRC diversities is also considered."