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5G Concepts
Published in Saad Z. Asif, 5G Mobile Communications Concepts and Technologies, 2018
Air-Interface: The air-interface defines the method for transmitting/receiving information over the air between mobiles and base stations. The air interfaces of 2G, 3G, and 4G were all designed while keeping certain KPIs (Key Performance Indicators) in mind (for example, mean opinion score for voice, dropped/blocked call rates, data throughput, etc.). However, the emerging trends of IoTs, M2M (Machine to Machine), V2X, and so on are all demanding to go beyond such a static/specific approach.
An efficient SLM technique based on chaotic biogeography-based optimization algorithm for PAPR reduction in GFDM waveform
Published in Automatika, 2023
S. Selvin Pradeep Kumar, C. Agees Kumar, R. Jemila Rose
As an air interface technique, several wireless protocols include Orthogonal Frequency Division Multiplexing (OFDM) [3]. DAB (digital audio broadcasting), DVBT (digital video broadcasting for terrestrial television), WLAN (802.11family), and 4G cellular technologies are all examples (LTE-A). OFDM has several advantages, including low complexity equalization, which makes it immune to inter-symbolic interference (ISI). This is accomplished through the use of a Cyclic Prefix (CP) and Frequency Domain Equalization (FDE). The efficient use of IFFT/FFT processing reduces the Waveform processing. Seyye Hadi et al. [4] proposed the greedy deterministic algorithms based on the OFDM system. In this technique, they optimize the value with the help of pilot. The pilot are references signal to use in transmit and receive side.
A Holistic Experimental Static Bias Point Identification Method for Low Power Wireless RF Amplifier
Published in IETE Journal of Research, 2022
Saroj K. Patro, Rabindra K. Mishra, Ajit K. Panda
Radio Frequency (RF) Power Amplifier (PA) is one of the major frontend components of a modern wireless Base Station (BS) and contribute significantly to the overall power consumption of the radio hardware [1–4]. As the low power BS systems require the PA to be power efficient, cost-effective and simpler in implementation, it often becomes a major challenge to achieve this goal. Further, these BS systems use wireless air interface standards such as Wideband Code Division Multiple Access (WCDMA) and High Speed Packet Access (HSPA) which are associated with higher Peak-to-Average-Power-Ratio (PAPR) signals. While at one hand, these spectrally efficient signals provide higher data throughput, they pose significant challenge for the PA stage to meet both the linearity and efficiency targets.
MIMO-OFDM channel estimation based on minimum error entropy criterion under non-Gaussian environment
Published in International Journal of Electronics Letters, 2023
Arash Soltani, Mehdi Airamlozadeh, Jaber Parchami
OFDM is a physical-layer modulation technique (Schulze & Lueders, 2005). An N-tap frequency-selective channel can be turned into N-parallel flat-fading channels (Schulze & Lueders, 2005). OFDM is already used in IEEE 802.11a, 802.16a, Digital Audio Broadcasting (DAB) and Digital Video Broadcasting (DVB-T). Due to their high data speeds and bandwidth efficiency, MIMO systems (multi-antenna transmitter/receiver) have several uses. MIMO-OFDM is the air-interface solution for next-generation broadband wireless systems and standards (Dinc & Akan, 2015; Manur & Ali, 2020; Wang et al., 2015).