Secured Audio Signal Transmission in Hybrid Prefixing Scheme Implemented Multicarrier CmWave Wireless Communication System
Laila Naznin,
Shaikh Enayet Ullah
Issue:
Volume 4, Issue 2, December 2018
Pages:
30-35
Received:
21 September 2018
Accepted:
9 October 2018
Published:
23 October 2018
DOI:
10.11648/j.awcn.20180402.11
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Abstract: In view of expense of extra redundancy and reduced spectral efficiency, prefix based multicarrier transmission can find its major applications in 5G and beyond 5G wireless communication networks with properly designed low complexity signal detection technique. Hybrid prefixing aided multicarrier modulated system is capable of providing reasonably acceptable bit-error rate (BER). In this paper, a comprehensive study has been made on performance evaluation of hybrid prefixing scheme implemented multicarrier cmWave wireless communication system on transmission of encrypted audio signal in a hostile flat fading channel. The 4×4 multi antenna configured simulated system under investigation incorporates LDPC and Repeat and Accumulate channel coding and various types of digital modulations (16-PSK, 16-DPSK, and 16-QAM) and signal detection (MMSE, and Cholesky Decomposition based) techniques. The implementation of pulse shaping filter in the simulated system is very much convenient to improve system performance in terms of BER through reduction of intersymbol interference (ISI). Additionally, utilization of hybrid prefix scheme enhances spectrum efficiency of the simulated system. It is noticeable from MATLAB based simulation study that the Repeat and Accumulate channel encoded simulated system is very much robust and effective in retrieving audio signal under utilization of Cholesky Decomposition based signal detection and 16-QAM digital modulation techniques.
Abstract: In view of expense of extra redundancy and reduced spectral efficiency, prefix based multicarrier transmission can find its major applications in 5G and beyond 5G wireless communication networks with properly designed low complexity signal detection technique. Hybrid prefixing aided multicarrier modulated system is capable of providing reasonably a...
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An Interference Coordination Scheme in Ultra-Dense Networks Based on Power Control
Issue:
Volume 4, Issue 2, December 2018
Pages:
36-42
Received:
25 September 2018
Accepted:
16 October 2018
Published:
27 October 2018
DOI:
10.11648/j.awcn.20180402.12
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Abstract: A large number of small cells are deployed in a traditional heterogeneous network to form an ultra-dense network. The ultra-dense network effectively increases the capacity of the network, but also introduces serious interference problems between low-power nodes. In order to solve the problem of downlink interference existing in the ultra-dense network, a new technical scheme based on power control (PCICS) is proposed. The PCICS scheme simultaneously determines the number of neighbor nodes around the central node and the size of the interference to the neighboring nodes as the determining node that needs to control the power. Then it translates the interference from neighboring nodes into its distance from the central node. It simplifies the method of determining the size of the interference. Then the node that meets the threshold condition is determined as the interference source node. Finally, the interference source node controls the transmission power under the condition of ensuring the normal communication of the user according to the feedback signal of the user. Therefore, the proposed solution minimizes interference to system users. Experimental data show that, compared to the TAPB algorithm, the average degree of system interference of the proposed scheme is basically the same. The average SINR is increased by 5~8dB. The average system throughput is increased by about 50%. Simulation results demonstrate that, in the case of increasing the interference source node judgment condition, the proposed scheme can effectively improve the system throughput and reduce the system power loss.
Abstract: A large number of small cells are deployed in a traditional heterogeneous network to form an ultra-dense network. The ultra-dense network effectively increases the capacity of the network, but also introduces serious interference problems between low-power nodes. In order to solve the problem of downlink interference existing in the ultra-dense net...
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BER Performance Analysis of an LDPC Coded OFDM Optical Wireless Communication System with Intensity Modulation and a Direct Detection Receiver
Bobby Barua,
Satya Prasad Majumder
Issue:
Volume 4, Issue 2, December 2018
Pages:
43-48
Received:
10 December 2018
Accepted:
25 December 2018
Published:
18 January 2019
DOI:
10.11648/j.awcn.20180402.13
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Abstract: Optical wireless (OW) that is also known as free space optical (FSO) communication system are impaired by adverse weather conditions, such as rain, fog, cloud, snow and atmospheric turbulences. To reduce the destructive effect of atmospheric turbulence, OFDM technique itself have already been reported in several publications which is not sufficient to improve the performance. So channel coding with OFDM in OW havebeen proposed in literature. LDPC-coded OFDM enhances the immunity to the atmospheric turbulence in optical wireless communication systems. In this paper we provide a logical way to evaluate the exhibitions of LDPC coded OFDM OW correspondence framework with the impact of solid air disturbance. The scientific perception demonstrates that the framework endures penalty due to atmospheric turbulence and the degradations of BER are evaluated for several values of system parameters like number of OFDM subcarriers, code word length, interface separate, information rate and quality of the disturbance which is spoken to through refractive list structure parameter. Examination likewise demonstrates that the framework exhibitions enhances due to LDPC code and the coding addition of the LDPC coded OFDM framework with 64 sub-bearers are investigated. It is seen that LDPC coded OFDM OW framework gives 12 to 15 dB improvements over uncoded OFDM OW frame work at a BER of 10-9.
Abstract: Optical wireless (OW) that is also known as free space optical (FSO) communication system are impaired by adverse weather conditions, such as rain, fog, cloud, snow and atmospheric turbulences. To reduce the destructive effect of atmospheric turbulence, OFDM technique itself have already been reported in several publications which is not sufficient...
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