Qualcomm Interprets Key Technologies in 5G
The arrival of 4G seems to be still yesterday, but 5G is close at hand. According to the 3GPP's plan, the large-scale testing and deployment of 5G will begin as early as 2019. In other words, as soon as more than a year, we can enjoy the new experience brought by 5G. However, as a global communication standard, the significance of 5G is of course not limited to faster network speed and better mobile broadband experience. Its mission is to connect new industries and promote new services, such as promoting industrial automation, large-scale Internet of Things, smart home, and automation. Driving, etc. These industries and services have placed higher demands on the network, requiring the network to be more reliable, low-latency, wide-coverage, and more secure. The diverse needs of all walks of life are calling for a new network that is flexible, efficient and scalable. 5G came into being.
As a next-generation cellular network, the 5G network is based on the 5G NR (New Radio) unified air interface and is designed to meet the expanding global connectivity needs of the next decade and beyond. 5G NR technology is designed to support a wide range of device types, services and deployments, and will leverage all available frequency bands and spectrum. Obviously, the design of 5G NR is a big project. It is impossible or impossible to build 5G NR from scratch. In fact, 5G will be based on 4G LTE to fully utilize and innovate existing advanced technologies.
Figure 1: Application areas of 5G
Qualcomm believes that to achieve 5G NR construction, there are three key technologies that are indispensable: 1. OFDM-optimized waveform and multiple access (OpTImized OFDM-based waveforms and mulTIple access, Orthogonal Frequency Division MulTIplexing, Orthogonal Frequency Division) Reuse), 2. Flexible framework design (A flexible framework), 3. Advanced wireless technologies.
Figure 2: Key technologies for 5G NR
One of the most important decisions in the 5G NR design process based on OFDM-optimized OFDM-based waveforms and multiple access is the use of OFDM-optimized waveform and multiple access techniques because OFDM technology is Today's 4G LTE and Wi-Fi systems are widely adopted, and because they scale to large bandwidth applications with high spectral efficiency and low data complexity, they are well suited to 5G requirements. The OFDM family of technologies enables a variety of enhancements, such as enhanced frequency localization through windowing or filtering, increased multiplexing efficiency between different users and services, and the creation of single-carrier OFDM waveforms for efficient energy-efficient uplink transmission.
Figure 3: Waveform based on OFDM optimization
To sum up, OFDM has the following advantages: • Low complexity: Compatible with low-complexity signal receivers, such as mobile devices. High spectral efficiency: MIMO can be used efficiently to improve data transmission. effectiveness. • Low power consumption: Energy-efficient uplink transmission can be achieved with a single carrier waveform. Frequency localization: It can increase the frequency localization by windowing and filtering to minimize signal interference.
Figure 4: Extensible subcarriers
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