Enhancement of MC-CDMA performance system using Rotated Modulation

Suharja, Khairunnisa Alfiyanti; Astuti, Rina Pudji; Meylani, Linda; Fahmi, Arfianto

doi:10.1109/comnetsat.2016.7907408

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…In order for distortionless transmission at the output of the receiver, the receiver added equalization channel. The received signal in the frequency domain becomes: (9) From equation (9), we can obtain the frequency response equation of channel equalization:…”

Section: Channel Equalization At the Receivermentioning

confidence: 99%

“…The application of rotate modulation in the signal constellation also can improve mutual information in Rayleigh fading [8]. Rotate modulation applied to OFDM systems have been explored by [9] and [10]. Reference [9] has discussed the application of Coding Rotate Modulation for enhanced performance of OFDM and CDMA combined systems.…”

Section: Introductionmentioning

confidence: 99%

“…Rotate modulation applied to OFDM systems have been explored by [9] and [10]. Reference [9] has discussed the application of Coding Rotate Modulation for enhanced performance of OFDM and CDMA combined systems. The result of the application of Coded Constellation Rotated Vector OFDM with Almost Linear Interleaver can improve OFDM system performance [10].…”

Section: Introductionmentioning

confidence: 99%

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Joint Power Loading and Phase Shifting on Signal Constellation for Transmit Power Saving on OFDM/OFDMA Systems

Prasetya

Kurniawan

Iskandar

et al. 2018

Int. J. Adv. Sci. Eng. Inf. Technol.

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Power loading and phase shifting are generally applied separately to improve the performance of OFDM / OFDMA digital communication systems. In this paper, we propose a new method by combining the two to save transmit power. The channel information feedback used on prior power loading is just a channel gain, so in our method, channel state information at the transmitter (CSIT) feedback is a complex quantity. The magnitude of the channel is used to adjust the power allocation of each subcarrier, while the information on the channel phase is used to adjust the phase shifting. Our proposed method uses the principle of channel equalization but we apply in the transmitter. The first step in our research, we derive mathematical equations in the system model to obtain the ideal quality of communication. Next, to get curves that state the quality of the system, we do simulations with the help of computing software. From the simulation results, when the CSIT works perfectly, the resulting performance in terms of the probability of error is equal to the system passing through the AWGN channel, which means the maximum power savings. Although CSIT is not perfect but can still get power savings on the transmitter side. The more accurate CSIT, the greater the power saving is obtained. For low level modulation, 70% accuracy can get maximum pawer savings. The simulation results also show that the application of the propose method has a much better performance compared to the application of channel equalization on the receiver.

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Section: Channel Equalization At the Receivermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joint Power Loading and Phase Shifting on Signal Constellation for Transmit Power Saving on OFDM/OFDMA Systems

Prasetya

Kurniawan

Iskandar

et al. 2018

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…Zafar Ali Khan dan Sundar Rajan pada [9] menunjukkan bahwa TCM asimetris dengan 4 state dapat meningkatkan kinerja TCM pada kanal Fading Rayleigh. Misra [10] melakukan proses decoding TCM dengan menggunakan metode ant neural network (ANN), sedangkan Samreen Amir [11] dan Khairunnisa [12] menunjukkan kinerja TCM pada sistem MCCDMA ketika melewati kanal fading.…”

Section: Pendahuluanunclassified

Kinerja Rotated Coded 8 PSK Pada Kanal Rayleigh

Meylani

Andini²,

Hidayat³

et al. 2018

JETT

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Diversitas ruang sinyal merupakan salah satu teknik yang dapat digunakan untuk meningkatkan kinerja sistem tanpa menggunakan error control coding, meningkatkan daya transmisi ataupun menurunkan data rate. Teknik diversitas ruang dapat dilakukan dengan melakukan rotasi pada konstelasi sinyal. Paper ini bertujuan untuk meningkatkan kinerja MC-CDMA dengan menggabungkan skema coded modulation 8 PSK dan skema rotasi. Berdasarkan hasil simulasi, diperoleh bahwa pada kanal fading skema rotated modulation dan coded modulation memberikan adanya perbaikan kinerja pada sistem MC-CDMA, namun pada kanal AWGN, perbaikan kinerja hanya ditunjukkan oleh penggunaan coded modulation.

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“…In the last two decades, the MC-CDMA technique has been a powerful alternative to conventional modulation techniques for downlink systems since its spectral efficiency is high and its receiver complexity is low [1]. Today, it is still preferred as a popular multiple access technique for next generation wireless communication systems [2][3][4][5]. In multicarrier systems, if the symbol duration is smaller than the channel delay, multipath propagation causes serious multiple access interference (MAI) and intersymbol interference (ISI).…”

Section: Motivation and Previous Workmentioning

confidence: 99%

Iterative Receiver with Low Complexity for Downlink Multicarrier Communications over Rapidly Time‐Varying Channels

Kabaoglu

Erdoğan

Aydin

2018

Wireless Communications and Mobile Computing

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This study proposes an iterative, joint channel estimation, equalization, and data detection method in the presence of high mobility for a multicarrier downlink system that communicates over rapidly time-varying channels. The proposed method uses a basis expansion method (BEM) which has low computational complexity and helps to reduce the number of coefficients needed to represent a time-varying channel and therefore is extremely easy to implement practically. Unlike the current literature, which is almost entirely focused on the uplink communication systems due to their computational costs, this method prioritizes the goal of being feasible in a downlink system with a reasonable performance. The proposed suboptimal algorithm is based on the space-alternating generalized expectation-maximization (SAGE) algorithm and the time-varying channel is represented by orthogonal basis functions obtained by means of discrete Walsh-Hadamard transform (DWHT). The resulting receiver iterates between maximum a posteriori (MAP) based channel estimation in the subspace spanned by the orthogonal basis functions and successive interference cancellation. Numerical examples show that the proposed algorithm has a satisfactory symbol error rate with low computational complexity and also has a reasonable peak-to-average power ratio (PAPR) reduction effect.

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Enhancement of MC-CDMA performance system using Rotated Modulation

Cited by 6 publications

References 4 publications

Joint Power Loading and Phase Shifting on Signal Constellation for Transmit Power Saving on OFDM/OFDMA Systems

Joint Power Loading and Phase Shifting on Signal Constellation for Transmit Power Saving on OFDM/OFDMA Systems

Kinerja Rotated Coded 8 PSK Pada Kanal Rayleigh

Iterative Receiver with Low Complexity for Downlink Multicarrier Communications over Rapidly Time‐Varying Channels

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