Technical Overviews
5G New Radio Modulation Analysis 89600 VSA Software
Option BHN
– See through the complexity of 3GPP 5G New Radio (NR) signals with a comprehensive and forward compatible set of tools for demodulation and vector signal analysis
– Address the wide range of design and measurement challenges arising from the use of mmWave frequency, multiple numerologies, and CP-OFDM waveforms
– Analyze downlink and uplink signals and derive signal quality: Overall EVM, EVM across symbols and subcarriers, constellations, IQ error plots and more
– Use the color coding and marker coupling features to identify and isolate specific signal and channel effects and impairments
– Analyze LTE and 5G NR simultaneously for LTE-NR integration and coexistence testing
3GPP 5G NR Physical Layer Overview
3GPP Release 15 delivers the first set of 5G standards with the focus on urgent market needs for enhanced mobile broadband (eMBB) and ultra-reliable low latency communication (URLLC). To achieve higher data rates, improve connectivity, and reach higher capacity required for eMBB, in addition to using sub-6 GHz frequencies, 5G will also operate in millimeter wave (mmWave) frequency bands, which has significantly wider contiguous bandwidths.
Waveform, numerology and frame structure
Waveform
Like LTE, 5G NR downlink transmission waveform is conventional OFDM using a cyclic prefix (CP-OFDM). Unlike LTE, the main uplink waveform is CP-OFDM. Transmit precoding, or DFT-S-OFDM, based waveform can also be used for uplink; however it is limited to single stream transmissions targeting devices with limited link budget.
Numerology
Multiple OFDM numerologies (µ), as shown in Table 1, are defined to handle wide range of frequencies, bandwidths and deployment scenarios. The numerology is based on exponentially scalable subcarrier spacing Δf = 2µ × 15 kHz, where the LTE numerology of 15 kHz subcarrier spacing is the baseline numerology
Frame structure
Downlink (DL) and uplink (UL) transmissions are organized into frames with 10 ms duration, consisting of ten 1 ms subframes. The number of slots within a subframe or a frame depends on the numerology, as shown in Figure 1. A slot is a scheduling unit and it can contain all DL, all UL or a mix of UL and DL data. There are 14 consecutive OFDM symbols in a slot with normal CP, and 12 OFDM symbols with extended CP.
Carrier bandwidth part (BWP)
Carrier bandwidth part is a contiguous subset of the physical resource blocks (PRBs) defined for a given numerology on a given component carrier. One or multiple BWP configuration for each component carrier can be signaled to a user equipment (UE); however, only one BWP in DL and one in UL is active at a given time instant. This means, the UE cannot transmit PUSCH or PUCCH and cannot receive PDSCH or PDCCH outside an active BWP. Configuration parameters for each BWP includes numerology, frequency location, bandwidth size, and control resource set (CORESET).
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