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1
Wykorzystanie informacji kontekstowej do poprawy efektywności widmowej w systemach radiowych
Kułacz Łukasz
Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
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2023
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nr 4
147--150
PL
Wobec wymagań dotyczących zasobów radiowych jednym z rozważanych podejść jest wykorzystanie systemów dynamicznego alokacji zasobów radiowych. Systemy te potrzebują informacji kontekstowej o użytkownikach i samej sieci, aby optymalnie zarządzać widmem. W pracy rozważono wykorzystanie informacji kontekstowej do poprawy efektywności widmowej w sieciach radiowych. Rozwiązania zostały zweryfikowane poprzez symulacje działania sieci, a niektóre zaimplementowano i przetestowano z wykorzystaniem rzeczywistych urządzeń.
EN
In view of the radio resource requirements, one of the approaches being considered is the use of dynamic radio resource allocation systems. These systems need contextual information about users and the network itself to optimally manage the spectrum. The paper considers the use of contextual information to improve spectral efficiency in radio networks. The solutions have been verified through simulations of network operation, and some have been implemented and tested using real devices.
2
Content available Throughput, Spectral, and Energy Efficiency of 5G Massive MIMO Applications Using Different Linear Precoding Schemes
Salah Ibrahim, Rahouma Kamel Hussein, Hussein Aziza I., Mabrook M. Mourad
International Journal of Electronics and Telecommunications
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2023
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Vol. 69, No. 1
185--191
EN
On fifth-generation wireless networks, a potential massive MIMO system is used to meet the ever-increasing request for high-traffic data rates, high-resolution streaming media, and cognitive communication. In order to boost the trade-off between energy efficiency (EE), spectral efficiency (SE), and throughput in wireless 5G networks, massive MIMO systems are essential. This paper proposes a strategy for EE 5G optimization utilizing massive MIMO technology. The massive MIMO system architecture would enhance the trade-off between throughput and EE at the optimum number of working antennas. Moreover, the EE-SE tradeoff is adjusted for downlink and uplink massive MIMO systems employing linear precoding techniques such as Multiple -Minimum Mean Square Error (M-MMSE), Regularized Zero Forcing (RZF), Zero Forcing (ZF), and Maximum Ratio (MR). Throughput is increased by adding more antennas at the optimum EE, according to the analysis of simulation findings. Next, utilizing M MMSE instead of RZF and ZF, the suggested trading strategy is enhanced and optimized. The results indicate that M-MMSE provides the best tradeoff between EE and throughput at the determined optimal ratio between active antennas and active users equipment’s (UE).
3
Content available Subcarrier Filtering For Spectrally Efficient Multicarrier Modulation Schemes and Its Impact on PAPR: A Unified Approach
Shanbhag Kiran V., Sathish Dayakshini
International Journal of Electronics and Telecommunications
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2023
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Vol. 69, No. 4
785--791
EN
Multicarrier modulation (MCM) based schemes have been a major contributing factor in revolutionizing cellular networks due to their ability to overcome fading. One of the popular scheme orthogonal frequency division multiple access (OFDMA), having been part of 4G, is also adapted as part of 5G enhanced mobile broadband (eMBB). Though it has several advantages, spectral efficiency (SE) and peak to average power ratio (PAPR) have been two major concerns which have attracted lot of attention resulting in proposals of several other MCM schemes. But most of these studies have treated the two issues independently. This paper in particular studies the subcarrier filtering approach to improve the spectral efficiency of MCM scheme and its impact on the overall PAPR of such schemes. The analysis shows that the PAPR improvement is also achieved by such filters meant for spectral confinement and the simulation results validate the same provoking.
4
Content available Improved Water-Filling Power Allocation for Energy-Efficient Massive MIMO Downlink Transmissions
Noor Shahida M. K., Nordin R., Insmail M.
International Journal of Electronics and Telecommunications
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2017
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Vol. 63, No. 1
79--84
EN
Energy Efficiency (EE) is becoming increasingly important for wireless communications and has caught more attention due to steadily rising energy costs and environmental concerns. Recently, a new network architecture known as Massive Multiple-Input Multiple-Output (MIMO) has been proposed with the remarkable potential to achieve huge gains in EE with simple linear processing. In this paper, a power allocation algorithm is proposed for EE to achieve the optimal EE in Massive MIMO. Based on the simplified expression, we develop a new algorithm to compute the optimal power allocation algorithm and it has been compared with the existing scheme from the previous literature. An improved water filling algorithm is proposed and embedded in the power allocation algorithm to maximize EE and Spectral Efficiency (SE). The numerical analysis of the simulation results indicates an improvement of 40% in EE and 50% in SE at the downlink transmission, compared to the other existing schemes. Furthermore, the results revealed that SE does not influence the EE enhancement after using the proposed algorithm as the number of Massive MIMO antenna at the Base Station (BS) increases.
5
Content available remote Improvement of Relay Link Capacity in a Multi-hop System by using a Directional Antenna in LTE-A Cellular Network
Aldhaibani J. A., Yahya A., Ahmad R. B.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 11
195-201
EN
This paper introduces a new approach for enhancing relay link quality. Two types of antennas were proposed at the relay node (RN). The first type is the directional antenna, which is directed toward the base station to achieve the maximum relay location range and improve the relay link quality, thereby reducing outage probability by increasing relay link capacity. The second type is the omni-directional antenna, which is used for the exchange of information between the RN and attached users. The optimum relay location was derived, thus ensuring the maximum spectral efficiency and best received signal strength over the relay link and cell edge. An improvement of 32% in spectral efficiency and a difference of−62 dBm to −50dBm in received signal strength at the relay link has been observed while considering Interference from neighboring cells. An ATDI simulator, which manages the digital cartography for the first tier of interference in urban areas, verified the numerical results.
PL
Opisano metody poprawy transmisji w sieci komórkowej LTE. Zbadano dwie anteny – antenę kierunkową i wielokierunkową. Antena kierunkowa zapewnia najlepsza jakość transmisji, antena wielokierunkowa jest użyta do wymiany informacji między węzłem a użytkownikiem.
6
Content available remote Design and FPGA implementation of module for space multiplexing in multi-user MIMO system
Dabetić R., Saranovac L.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 8
162--165
EN
MIMO (multiple in multiple out) antenna system draw attention in the recent years due to its potential for achieving high data rates. In this work novel DSP algorithm and FPGA implementation will be presented that allows transmitting M data streams to M receiving antennas from N transmitting antennas (M ≤ N) into the same frequency with total interference suppression while maximizing channel gain for each data stream at the same time.
PL
W artykule zaprezentowano nowy algorytm DSP z implementacja w FPGA umożliwiający transmisję strumienia M danych do M anteny odbiornika z anteny przesyłowej N (M ≤ N) z tą sama częstotliwością z tłumieniem zakłóceń – przy maksymalizacji wzmocnienia dla każdego strumienia danych w kanale.
7
Content available On the spectral efficiency of incoherent optical MIMO systems
Siuzdak J, Kowalczyk M.
Optica Applicata
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2013
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Vol. 43, nr 3
497--503
EN
Spectral efficiency of incoherent optical MIMO systems is investigated. It is proved that under the best conditions (no channel crosstalk at the receiver) incoherent optical MIMO transmission gives potentially a better spectral efficiency than single channel transmission above a certain value of SNR in a single channel system, which varies from 9 dB for 2×2 MIMO to 12.3 dB for 4×4 MIMO. However, in practical optical 2×2 MIMO transmission, this border value of SNR is much higher and is around 25–30 dB.
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