scholarly journals The Communication System of Building from Outdoor to Indoor with AMC at 10 GHz

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Andrita Ceriana Eska
Keyword(s):  
Communication Systems ◽  
Signal To Noise Ratio ◽  
Adaptive Modulation ◽  
Mobile Station ◽  
Base Station ◽  
Propagation Model ◽  
Adaptive Modulation And Coding ◽  
Coverage Area ◽  
Communication Frequency ◽  
Station Location

The propagation model of communication systems was used propagation from outdoor to indoor of building. In the inside that building used partition with brick. That propagation condition used downlink condition from mobile station side. The communication frequency used 10 GHz. Some parameter variation was used in this research such as radio base station coverage, mobile station location of building, and code rate communication. The coverage variation of radio base station used femtocell and picocell. As the result described signal to noise ratio (SNR)at every node communication, adaptive modulation and coding (AMC) variation, and coverage area percentage in the building. The modulation and coding scheme (MCS) was used consist of QPSK, 16 QAM, and 64 QAM

scholarly journals Adaptive Modulation and Coding (AMC) around Building Environment for MS Communication at The Train

2018 ◽  
Vol 6 (2) ◽  
pp. 386-394
Author(s):  
Andrita Ceriana Eska
Keyword(s):  
Communication Systems ◽  
Adaptive Modulation ◽  
Mobile Station ◽  
Adaptive Modulation And Coding ◽  
Frequency Variation ◽  
Coverage Area ◽  
Communication Frequency ◽  
Building Environment ◽  
5 Ghz ◽  
Area Percentage

This paper focused at communication systems when train moved. The communication propagation was influenced by building environment. The communication condition that used uplink direction. Mobile station was placed inside the train where moved with 500 km/hour velocity. The analysis was used consists of Doppler effect, atmospheric, and building environment. The variation communication frequency was used consists of 2.6 GHz, 5 GHz, and 10 GHz. Diffraction mechanism caused building was used single knife edge method. The result was showed SNR value from the communication frequency variation, distance comparison between LOS and NLOS, alteration adaptive modulation and coding (AMC), and coverage area percentage. Modulation and Coding Scheme (MCS) was used for AMC consists of QPSK, 16 QAM, and 64 QAM. Decreases of SNR value can be occured when communication distance for NLOS condition farther then LOS condition. That distance became increases because was obstructed with high building. Changeable of AMC value was caused propagation condition. The coverage area percentage when communication frequency that was used consists of 2.6 GHz, 5 GHz, and 10 GHz was obtained 88.4%, 88.4%, and 81.7%.

HARQ Performance Analysis in IEEE 802.16m System

2013 ◽  
Vol 284-287 ◽  
pp. 2756-2760
Author(s):  
Hsien Wei Tseng ◽  
Yih Guang Jan ◽  
Wei Chen Lee ◽  
Shih Nan Lu ◽  
Yang Han Lee ◽  
...  
Keyword(s):  
Adaptive Modulation ◽  
Mobile Station ◽  
Base Station ◽  
Buffer Size ◽  
Adaptive Modulation And Coding ◽  
Type I ◽  
Error Ratio ◽  
Ieee 802.16M ◽  
Two Hybrid ◽  
Selection Of

In this paper we simulate and analyze the system performance of implementing two Hybrid Automatic Retransmission Request (HARQ) architectures for IEEE 802.16m system, one is a modified Type I HARQ architecture with adaptive modulation and coding (AMC) scheme and the other is the Chase Combining. In the simulation, the buffer size of HARQ has been set to certain limit and under the condition of having the packet error ratio (PER) limited by 10% then the selection of proper HARQ structure with suitable AMC scheme for IEEE 802.16m system has been proposed for mobile speeds at 3 km/hr, 80 km/hr or 350 km/hr and with a distance of 300m between the mobile station and its serving base station.

scholarly journals Pengaruh Code Rate untuk Komunikasi RBS Femto Cell Frekuensi 47 GHz pada Tiang Lampu Jalan

2017 ◽  
Vol 9 (4) ◽  
pp. 412
Author(s):  
Andrita Ceriana Eska
Keyword(s):  
Communication Systems ◽  
Mobile Station ◽  
Code Rate ◽  
Base Station ◽  
Rate Variation ◽  
Coverage Area ◽  
Transmitter Power ◽  
Street Lamp ◽  
Noise Ratio ◽  
Area Percentage

This research describes about the communication systems at radio-base-station femto cell that placed at street lamp. The frequency 47 GHz used at that communication systems. The analysis in this research consist of transmitter power variation, and code rate variation from signal-to-interference-plus-noise-ratio threshold 16 QAM. The transmitter power consist of 10 mW until 200 mW. The code rate variation from signal-to-interference-plus-noise-ratio threshold 16 QAM consist of 1/2, 2/3, 3/4, and 4/5. As the result showed relation between transmitter power with using code rate and relation between coverage area percentage at mobile station track with using code rate. Based on the relation between coverage area percentage with code rate value that is more increase code rate value then the percentage coverage area was getting decrease.

scholarly journals Cell ID and Angle of Departure Estimation for Millimeter-wave Cellular Systems in Line-of-Sight Dominant Conditions Using Zadoff-Chu Sequence Based Beam Weight

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 335 ◽  
Author(s):  
Yeong Jun Kim ◽  
Yong Soo Cho
Keyword(s):  
Millimeter Wave ◽  
Communication Systems ◽  
Estimation Method ◽  
Mobile Station ◽  
Base Station ◽  
Cellular Systems ◽  
Line Of Sight ◽  
High Attenuation ◽  
Conventional Methods ◽  
Dominant Condition

Millimeter-wave (mmWave) bands is considered for fifth-generation (5G) cellular systems because abundant spectrum is available for mobile broadband communications. In mmWave communication systems, accurate beamforming is important to compensate for high attenuation in the mmWave frequency band and to extend the transmission range. However, with the existing beamformers in mmWave cellular systems, the mobile station (MS) cannot identify the source (base station; BS) of the received beam because there are many neighboring BSs transmitting their training signals, requiring a large overhead. This paper proposes a new beam weight generation method for transmitting (Tx) beamformers at the BS in mmWave cellular systems during a beam training period. Beam weights are generated for Tx beamformers at neighboring BSs, so that a mobile station (MS) can estimate the source (cell ID; CID) and angle of departure (AoD) for each BS in multi-cell environments. A CID and AoD estimation method for mmWave cellular systems in a line-of-sight (LOS) dominant condition is presented using the beam weights generated by Zadoff-Chu sequence. A simulation is conducted in a LOS dominant condition to show that the performances of CID detection and AoD estimation are similar for both the proposed and conventional methods. In the conventional methods, the DFT-based beamforming weight is used for Tx beamformer at the BS and orthogonal matching pursuit (OMP) algorithm is used for AoD estimation at the MS. The proposed method significantly reduces the processing time (1.6–6.25%) required for beam training compared to the conventional method.

scholarly journals Effect of controlling maximum-SNR-based relay selection strategy in cooperative wireless communication systems

2021 ◽  
Vol 22 (1) ◽  
pp. 335
Author(s):  
Essam Saleh Altubaishi
Keyword(s):  
Wireless Communication ◽  
Spectral Efficiency ◽  
Communication Systems ◽  
Relay Selection ◽  
Signal To Noise Ratio ◽  
Adaptive Modulation ◽  
Selection Criterion ◽  
Selection Strategy ◽  
Wireless Communication Systems ◽  
Selection Of

<span>Relay selection strategy under maximum-signal-to-noise ratio (MAX-SNR) criterion was proven to maximize performance but at the expense of losing fairness among the cooperative relays. In this work, the effect of controlling the MAX-SNR criterion on the spectral efficiency of cooperative wireless communication system with adaptive modulation is investigated. Specifically, the probability density function (PDF) of the end-to-end SNR for the considered system is derived when the controlled selection criterion is considered. Base on that PDF, the average spectral efficiency is then derived and investigated. The results show how the spectral efficiency of the system deteriorates as controlling the selection of a relay. Furthermore, the results of Monte Carlo simulation validate the derived expression.</span>

scholarly journals Performance Analysis of Reduced Handoff Interruption Time and Energy Utilization in Cognitive Radio Networks by Unmanned Area Vehicle

2019 ◽  
Vol 8 (4) ◽  
pp. 9483-9486
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Communication Systems ◽  
Data Exchange ◽  
Mobile Station ◽  
Radio Networks ◽  
Base Station ◽  
Energy Utilization ◽  
Handover Management ◽  
Management Algorithm

The WiMAX (Worldwide Interoperability Microwave Access) is important in communication systems. Mobility is also important in WiMax to achieve high speed in data exchange over the medium. During the exchange of data handoff may be occurred.This paper is focused on handoff in WiMAX and MS (Mobile Station). The Handover Management Algorithm is used to avoid handoff in addition to improve the handover interruption time and to decrease the signaling transaction during the handover procedure we used Global Position System (GPS) to perform handoff faster. GPS has been introduced in this paper to find the position of the MS and BS then the MS will automatically choose BS by routing. We developed a new algorithm to improve the handoff interruption by introducing Time Division Multiple Access (TDMA).The MS finds its position using GPS and find the distance to the SBS (Source Base Station) and nearby BSs. In the next step,MS selects the target BS based on distance. Moreover we combine Handover Management Algorithm (HMA) with Cognitive radio networks (CRNs) for which are the way out for the trouble of underutilizing the license spectrum for which there are more needs in the final pair of decades. The congestion of the wireless spectrum has triggered a stringent contest for panic network resources.

Adaptive MMSE Multiuser Detection in MIMO OFDM Wireless Communication System

2011 ◽  
Vol 367 ◽  
pp. 233-240 ◽  
Author(s):  
T. Eneh ◽  
P. Rapajic ◽  
K. Anang ◽  
Bello Lawal
Keyword(s):  
Signal Processing ◽  
Wireless Communication ◽  
Multiuser Detection ◽  
Communication Systems ◽  
Power Transmission ◽  
Signal To Noise Ratio ◽  
Mobile Station ◽  
Signal To Noise ◽  
Mimo Ofdm ◽  
Noise Ratio

The combination of MIMO signal processing with OFDM is a solution to achieving high data rates for next generation wireless communication systems operating in frequency selective fading environments. To realize the extension of the MIMO with OFDM, a number of changes are required in the baseband signal processing. The developed adaptive Multiuser Detection in MIMO OFDM(AMUD) scheme performs better compared to non adaptive MIMO OFDM, at low Signal to noise ratio (SNR), it shows good performance in computational complexity, bit error rate (BER) and capacity. Simulation results show that the developed algorithm sum rate capacity is very close to MIMO theoretical upper bound (21.5 bits/s/Hz at signal to noise ratio of 20dB) which strongly indicate it’s applicability to the uplink channel where power transmission at the mobile station is a constraint. The BER performance of the developed scheme shows that, as the number of antenna increases, the 8 x 8 AMUD provides a 2dB gain compared to known non adaptive MIMO OFDMO at low SNR.

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