Capacity enhancement using adaptive power and sub-carriers allocation under imperfect CSI in MC-CDMA systems

Mehmood, Imran; Ashraf, Muhammad Aqueel; Shabir, Kashif

doi:10.1109/ibcast.2017.7868143

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…This property is tightly adhered to the location of subcarriers. If the location of these subcarriers are dispositioned, then the orthogonality will fall apart and the system will experience the inter channel interference (ICI) [24]. The ICI will reduce the system performance due to the decrease in the signal quality.…”

Section: Ofdm and Cdma Systemsmentioning

confidence: 99%

“…Where 𝑛 1 (𝑡) and 𝑛 2 (𝑡) are the AWGN in the first and second transmission instances respectively. Combining (24) with (25), then it can be shown that:…”

Section: Frequency Flat Fading Channel and Space Time Block Codingmentioning

confidence: 99%

“…Therefore, by using MPA and extending it to the DWPT, series of 𝑥[𝑛] vector can be analyzed using the following transformation matrix for 𝐿 number of stages [23], [24]. By substituting (11) in ( 14), the transformation matrix becomes:…”

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confidence: 99%

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BER estimation for STBC-MC-DS-CDMA-4 antennas system by varied wavelet-carriers features via AWGN-flat channels

Khadam,

Kadhim Jawad Alrubaie,

Jumah Al-Thahab

2024

Bulletin EEI

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This paper improves the bit error rate (BER) of the modern communication system by taking into account the effect of the wavelet shape and the number of carriers on the performance of the space time block code multi-carrier direct sequence code division multiple access (STBC-MC-DS-CDMA). Here the transmitter is moved with speeds 2 km/hr, 45 km/hr and 100 km/hr via Rayleigh flat fading channel. Here, 2 antennas are employed at the receiver to mitigate the multipath signal influence. The system’s orthogonal frequencies are generated using Haar, Daubechies 4, Symlets 4, Cohen-Daubechies-Feauveau 1.1 with 9.7 and B-spline 3. The number of used carriers is 128, 512, and 1,024. Quadrature phase shift key (QPSK) is used with cyclic prefix 1/16 and a bandwidth of 20 MHz. traditional fast fourier transform (FFT) system is compared to the proposed discrete wavelet packet transform (DWPT) to show the BER enhancements. The space-time block coding (STBC) is used to enhance system cabability in error corection. The proposed system shows significant improvement in BER, so that, it reaches to the same BER when using FFT but with less signal to noise ratio (SNR), which interns reduce the power consumed within the system and the cost.

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Section: Ofdm and Cdma Systemsmentioning

confidence: 99%

“…Where 𝑛 1 (𝑡) and 𝑛 2 (𝑡) are the AWGN in the first and second transmission instances respectively. Combining (24) with (25), then it can be shown that:…”

Section: Frequency Flat Fading Channel and Space Time Block Codingmentioning

confidence: 99%

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BER estimation for STBC-MC-DS-CDMA-4 antennas system by varied wavelet-carriers features via AWGN-flat channels

Khadam,

Kadhim Jawad Alrubaie,

Jumah Al-Thahab

2024

Bulletin EEI

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“…Since, the channel is influenced by multipath propagation. Thus, an increase of the occurrence probability under fading and ISI is noted [31]. The implementation aspects of wireless technology lead to recent levels by the increasing demands of better quality of service (QoS) and rising number of channel users.…”

Section: Introductionmentioning

confidence: 99%

Outage Probability and Capacity improvement of A Wireless Communication Systems

Ali,

El-Tokhy,

Kayed

2023

Arab Journal of Nuclear Sciences and Applications

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The paper focuses on improving wireless communication networks for nuclear radiation monitoring by analyzing and evaluating the performance of Multi Carrier Code Division Multiple Access (MC-CDMA) as a wireless communication system. The work aims to determine the outage probability as a quality-of-service parameter and investigate the average channel capacity under channel deterioration. They use closed form expressions to present the performances of these characteristics and study the impact of the number of branches and subcarriers on the outage probability. In addition, the authors propose a robust and reliable approach to channel under fading and study the capacity of MC-CDMA with the largest number of users. The results obtained from the study confirm that exponential channel fading achieves the lowest outage probability compared to other channel degradations. Moreover, the proposed results guarantee high average channel capacity and high throughput, which are essential for the successful deployment of MC-CDMA systems. The findings of this study provide valuable information for researchers and engineers working in the field of wireless communication systems, particularly those interested in the design and optimization of MC-CDMA systems. Overall, the paper contributes to the understanding of the performance of MC-CDMA systems under various channel conditions and provides insights into the design and optimization of such systems. The results show that the importance of utilizing robust and reliable wireless communication systems in nuclear radiation monitoring to ensure the accuracy and reliability of the data obtained.

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Capacity enhancement using adaptive power and sub-carriers allocation under imperfect CSI in MC-CDMA systems

Cited by 2 publications

References 11 publications

BER estimation for STBC-MC-DS-CDMA-4 antennas system by varied wavelet-carriers features via AWGN-flat channels

BER estimation for STBC-MC-DS-CDMA-4 antennas system by varied wavelet-carriers features via AWGN-flat channels

Outage Probability and Capacity improvement of A Wireless Communication Systems

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