From 2G, 3G to 4G, there are so many amazing innovations in the field of wireless technology that we are now getting faster and faster, more and more applications.
The emergence of 5G mobile networks
Will bring earth-shaking changes to our world
Smart City Citywide
Auto driving dreams come true
UAV application new tricks
Virtual reality (VR), another way to open the world
In order to realize 5G at an early date, Qualcomm is actively working on 5G design to promote and accelerate its development. To truly make the 5G NR and 5G vision a reality, you have to say five key wireless inventions.
Let's let Dr. John E. Smee of Qualcomm introduce you to these five inventions:
Invention 1
Scalable OFDM parameter configuration for 2n subcarrier spacing extension
One of the most important decisions in the 5G NR design is the choice of radio waveform and multiple access technology. While evaluating and continuing to evaluate multiple approaches, Qualcomm discovered through extensive research (published in the Qualcomm Research report a year ago) that Orthogonal Frequency Division Multiplexing (OFDM) systems—specifically, cyclic prefix orthogonality Frequency Division Multiplexing (CP-OFDM) 1 and Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S OFDM) 2 - the right choice for enhanced mobile broadband (eMBB) and many other scenarios .
Scalable OFDM parameter configuration
Since LTE uses OFDM in the downlink and DFT-S OFDM in the uplink, our research shows that the uplink supports DFT-S-OFDM and CP OFDM with advantages, based on scene adaptive switching for DFT-S Both OFDM's link budget and MIMO spatial multiplexing are beneficial. The recent 3GPP NR 14th Edition research project agreed to support CP-OFDM in the eMBB downlink and complement the eMBB uplink DFT-S-OFDM with CP-OFDM.
Since OFDM is already in use today, you might ask "Where is the road to further innovation?"
The answer is a scalable OFDM multi-frequency parameter configuration.
Today, with a 15 kHz interval between OFDM tones (often referred to as subcarriers), which is almost a fixed OFDM parameter configuration, LTE supports carrier bandwidths of up to 20 MHz. With 5G NR, we have introduced a scalable OFDM parameter configuration that supports multiple spectrum bands/types and deployment modes. For example, a 5G NR must be able to operate on a millimeter wave band with a larger channel width (eg, hundreds of MHz). Our design introduces OFDM subcarrier spacing that can be extended with channel width, and does not increase processing complexity when the FFT is larger bandwidth extended.
Recently, 3GPP has selected a scalable OFDM parameter configuration that implements subcarrier spacing 2n extension in the 5G NR 14th Edition research project.
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