Radio access techniques

FDD vs TDD: What are FDD and TDD in mobile networks?

FDD and TDD are two fundamental concepts in mobile communications and other telecom systems. Together they represent the duplexing schemes in mobile networks that deal with two-way communication. FDD (Frequency Division Duplex) is a technique in mobile networks that uses separate frequency bands for uplink and downlink communication; TDD (Time Division Duplex) is a technique …

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Difference between MU-MIMO and SU-MIMO in mobile networks

Multi-User MIMO (MU-MIMO) and Single-User MIMO (SU-MIMO) are two antenna technologies used in modern wireless networks, including 4G and 5G mobile networks. While both MU-MIMO and SU-MIMO are part of the overall Multiple Input Multiple Output (MIMO) technology, there are key differences between the two that we will cover in this post. MU-MIMO uses radio …

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Is spatial multiplexing different from spatial diversity?

Spatial multiplexing and spatial diversity are two radio communication techniques used in modern antenna systems in 4G LTE and 5G NR networks. Both these techniques play essential but separate roles in the MIMO (Multiple Input Multiple Output) antenna systems. Spatial diversity is a technique in MIMO that reduces signal fading by sending multiple copies of …

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MIMO, Massive MIMO, Spatial Multiplexing and Beamforming

The cellular antenna technologies have evolved considerably since the introduction of 4G LTE networks that employ the MIMO (Multiple Input Multiple Output) antenna systems. The latest generation of mobile networks, 5G NR, also uses the MIMO technology. MIMO is a modern antenna technology that employs multiple antennas at the transmitter and the receiver in 4G …

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What is the difference between MIMO and carrier aggregation?

Modern cellular networks, including 4G LTE and 5G NR, use various technologies to improve data rates and signal quality for mobile phone users. MIMO and Carrier Aggregation are two such technologies that enhance the overall network capacity and coverage to deliver higher throughput and better radio link quality. MIMO (Multiple Input Multiple Output) combines signals …

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Difference between MIMO, SISO, SIMO and MISO antenna systems

Mobile networks today use advanced antenna systems that make use of multi-antenna technologies. MIMO, SISO, SIMO and MISO are types of antenna systems where SISO is the most basic and MIMO is the most advanced form of the radio communication link between the transmitter and the receiver. MIMO is an advanced antenna system that uses …

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Diversity vs MIMO: Is antenna diversity the same as MIMO?

Antenna diversity and MIMO (Multiple Input Multiple Output) are two technology concepts frequently used in mobile communications. Antenna diversity is a more fundamental concept, whereas MIMO is an antenna technology that benefits from antenna diversity. Antenna diversity is a technique in mobile networks that improves the radio link reliability through multiple antennas at the transmitter …

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What is 5G Massive MIMO technology and how does it work?

The fifth-generation (5G) mobile networks use a range of technologies to provide a much better experience to customers than the earlier 4G LTE networks. MIMO – Multiple Input Multiple Output is an antenna technology that is used in 4G LTE networks, but its enhanced version, Massive MIMO, is an essential building block in the 5G …

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