Signal Analysis in 5G NR Base Station Transmitters: Part 4

时间： 2022-09-06 来源：Keysight

技术问答

选型帮助

研发客服

商务客服

In the first, second, and third parts of the 5G signal analysis (spectrum analysis) conformance testing blog series, we discussed base station transmitter characteristics and required tests to comply with 3rd generation partnership project (3GPP) standards. In the last part of this blog series, we discuss the 5G NR conformance test challenges and the latest industry signal analyzer (spectrum analyzer) solutions to overcome these testing challenges.

5G NR Release 16 Conformance Test Challenges

According to conformance test requirements, all frequency range 2 (FR2) device and base station tests, and some FR1 base station tests, are radiated. This process results in over-the-air (OTA) testing, which introduces additional test challenges. Whether you are assessing transmitters, troubleshooting receivers, or analyzing OTA signals, flexibility in the hardware and software of your spectrum analyzer (signal analyzer) is very important to enable you to find the right solution for your needs. Let's have a look at the main testing challenges:

Excessive Path Loss

Excessive path loss is one of the main challenges in higher frequencies such as millimeter waves (mmWave). The components designed for mmWave devices are compact and highly integrated, with no place to probe. Unlike traditional cabled tests, this results in the need for radiated or OTA tests, which introduce many new challenges, including path loss. Greater path loss and higher measurement uncertainties make it difficult to achieve measurement accuracy. A test solution for mmWave designs must have an adequate signal-to-noise ratio (SNR) to accurately detect and demodulate 5G signals. The excessive path loss at mmWave frequencies between instruments and devices under test (DUT) results in a lower SNR for signal analysis, making transmitter measurements, such as EVM, adjacent channel power (ACP), and spurious emissions, challenging. Minimizing any possible path loss is critical for mmWave testing.

Wideband Noise

Another challenge in mmWave testing is the wideband noise, which increases the test complexity and measurement uncertainties. Even though mmWave can access higher frequencies, data rates, and wider bandwidths, it introduces more noise. The reason is that the transmit signal must compete with the channel's noise floor to increase the receiver sensitivity. As bandwidth increases, a signal can travel over a channel faster so that the receiver can receive it. However, introducing more noise to the spectrum analyzer (signal analyzer) reduces its SNR, making mmWave measurements more complex.

Frequency Response

The frequency response is another major mmWave testing challenge. The goal of a test system is to characterize a DUT. A system must isolate the DUT’s measured results from the effects of all other segments. The frequency response of a test system comes from components like mixers, filters, and amplifiers between a spectrum analyzer (signal analyzer) and a DUT. These responses have different frequencies and include amplitude and phase errors.

Signal Analysis Solutions

All wireless standards specify transmitter measurements at the maximum output power. You can optimize the input level by using an external low-noise amplifier (LNA) at the mixer input. The KEYSIGHT N9042B UXA X-Series signal analyzer provides a built-in LNA and preamplifier for various test scenarios. Figure 13 shows how the two-stage gain balances noise and distortion for optimizing the best low-input-level measurement performance. Also, Figure 1 shows a 5G demodulation analysis example, in which turning on the LNA has improved the EVM from 5.75% to 1.99%.

Figure 1. A comparison between the EVM measurements when LNA is OFF and ON

Keysight's V3050A external frequency extender with an integrated preselector and RF switch has a seamless operation interface that integrates with the N9042B UXA X-Series signal analyzer. This solution enables a sweeping power spectrum from 2Hz to 110GHz without managing band breaks and images. The U9361 RCal receiver calibrator, when used with the X-Series signal analyzers, can help move the reference plane to the DUT for accurate and efficient calibration. This way, you can calibrate the linear impairments in your test receiver system caused by fixtures, cables, and adapters in a compact and powerful device. Therefore, you can establish a calibration plane where the test receiver system physically connects to the DUT output.

The Keysight N9032B PXA X-Series signal analyzer delivers the widest analysis bandwidth in a 4U form factor with superior performance to satisfy your wide bandwidth requirements at lower frequencies. The N9032B signal analyzer offers up to 2GHz of bandwidth (four times more than other units) for all 8.4, 13.6, and 26.5GHz frequencies. With the same LNA and preamp as the UXA X-Series, this analyzer offers the best swept displayed average noise level (DANL) and the best EVM residuals and sensitivity. Figure 15 is an example of a 3 to 7dB improvement in the DANL because of the advanced front-end design in the N9032B PXA X-Series signal analyzer. By pairing industry-leading measurement software such as Keysight's PathWave X-Series measurement applications, Keysight PathWave vector signal analysis software (89600 VSA), plus the RCal receiver calibrator, and the Keysight VXG signal generator you can get a complete solution to help you stay ahead of the ever-changing regulations.

Figure 2. A comparison between the N9032B DANL signal analyzer with the Keysight N9030B and N9040B signal analyzers

As standards continue to evolve, test solutions need to support higher frequencies, wider bandwidths, and new physical layer features. You must have access to appropriate equipment suited to your needs to meet new test and specification requirements. It is essential to consider how quickly your equipment can incorporate software releases to meet the latest test cases. In collaboration with market leaders in 3GPP specifications and test cases, Keysight works with device and base station original equipment manufacturers (OEMs) to bring industry-first designs to market. This insight ensures test tools are submitted at specific intervals for verification by certification bodies to ensure compliance.

发送到邮箱 |
+1 赞 0
收藏
评论 0
| 转发至：

本文由Vicky转载自Keysight，原文标题为:Signal Analysis in 5G NR Base Station Transmitters: Part 4，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

全部评论（0）

暂无评论

Signal Generators: The Different Types and How They Work

In electronics, signals are analogous to speech. Just as we exchange information through conversation, electronics at all levels talk via signals — from microscopic transistors on tiny integrated circuits up to consumer devices and large systems like satellites. Being this ubiquitous means that in every industry, a substantial part of electronics testing goes into getting the signals right, and signal generators are the workhorses that make it possible.

技术探讨发布时间 : 2024-03-08

Learn the Basics of Signal Generator Accuracy

In this article, Keysight will provide guidance on the things you need to be aware of when selecting an RF signal generator.

技术探讨发布时间 : 2022-08-26

Keysight（是德科技）测试仪器分销产品选型指南（英文）

目录- BenchVue Control and Analysis Software RF Bench and Handheld Instruments Handheld Spectrum Analyzers FieldFox Handheld Analyzers Spectrum Analyzers, Signal Analyzer Audio Analyzer and Signal Generator Power Sensors and Power Meters RF and Microwave Test Accessories Vector Network Analyzers and ECal Modules Essential Bench Oscilloscopes, Applications, and Probes Digital Multimeters Function/Arbitrary Waveform Generators Data Acquisition/Switch Units USB Products and Connectivity Frequency Counters/Timers Power Supplies Bench Power Supplies System Power Supplies Precision Power Supplies System Power Supplies(continued) DC Power Analyzer, SMUs, and DC Electronic Loads AC Power Sources LCR Meters Handheld Instruments

型号- U8480,B2911A,U1272A,N8926A,34460A,N7040A,U8000,N9340B,53140,N5742A,N5766A,34905A,N9918A,N6735B,N8480,N5743A,N5767A,N1914A,3024T,3012T,U1273A,34904A,N6746B,N6734B,U3800,U1282A,N8948A,34470A,N7042A,N1913A,N5744A,N5768A,34903A,N8924A,N9916A,N9928A,34939A,N6701C,N8949A,U1271A,N8925A,N8937A,N7041A,N1912A,N9000B,N5745A,N5769A,N2819A,3022T,3034T,N6700C,34902A,N9917A,34938A,N6736B,U1600,8491A,DSOX1102G,DSOX1102A,N9320B,P-SERIES,33509B,N7020A,N1911A,N9344C,N5746A,N3302A,N2818A,34901A,34937A,U1701B,82357B,U1273AX,U2802A,N5181B,N2142A,U1281A,B2902A,4024A,N5747A,N3303A,8490G,N2805A,3032T,N6702C,U1700,N6705C,N8928A,N9342C,33519B,B2901A,N3304A,N5748A,34947A,N2804A,N8929A,N5171B,N9343C,N2140A,X-SERIES,B2912A,N3305A,U8903B,N5749A,4022A,34934A,4034A,34946A,8480D,3054T,U2702A,N3306A,U1733C,U1210,U2300,N5700,34945A,3458A,TU1453A,U2701A,B2962A,1146B,N3307A,1147B,N7026A,33600A,33612A,B2961A,N9322C,N9310A,U1731C,2002A,53200,2014A,3104T,U1610A,U2723A,33611A,2004A,U1732C,J7205A,34942A,U3606B,53210A,J7205B,U2722A,N1810UL,33622A,3102T,34941A,N8760A,2012A,2024A,U2500,U1620A,33512B,33500B,33621A,N1810TL,3004A,N6700,N6705,N8761A,N2821A,33511B,N3300,4104A,2022A,N2820A,U2600,33510B,33522B,3014T,N2843A,E36100B,33521B,N9962A,87106D,AC6804B,E4982A,DAQM905A,34950A-34959A,N6750,N9950A,N8740A,E36103B,U2020,EDUX1002A,N9951A,33520B,N7007A,83050A,N2962A,53131A,P9243A,E4981A,U2741A,34972A,E36102B,J7211B,J7211A,J7211C,E36320A,N8741A,AC6802B,DAQM903A,U1270,N9960A,E36311A,N8762A,E36105B,N6781A,U2000,E3641A,EDUX1002G,N2863B,AC6803B,DAQM904A,N8900,U1280,84904L,U2751A,34970A,N9961A,B2900,E36104B,E3640A,AC6800B,N2862B,6002A,E3600,E-SERIES,E36313A,DAQM900A,U1250,U5850,N8756A,N8732A,N8950A,AC6801B,10070D,DAQM902A,U2761A,34980A,E36300A,E36312A,N6782A,DAQM901A,E36106B,53220A,N8757A,87222D,N8733A,N8951A,87222E,N9952A,87104D,P9242A,E4980A,6004A,53132A,N6785A,N6773A,U1452A,B2980A,N6761A,N8754A,N8742A,P9241A,N2871A,53230A,N8700,N4985A-S50,U1240,N6784A,E4981A-001,E4981A-002,N8755A,U1453A,N8731A,N2870A,8495D,N2797A,87405B,N2894A,N5770A,8495B,87405C,34420A,E3647A,10833F,34921A-25A,10833G,10833A,10833B,4154A,10833C,10833D,N6775A,U1450A,N8736A,N6763A,U1232A,N8954A,N6751A,N8930A,N7550,N9923A,N2796A,N9935A,N2893A,N5771A,E36100,E3646A,6811C,N4985A-S30,4032A,N8737A,N6786A,N6774A,N8943A,N6762A,E5063A,10834A,N8955A,U1451A,8494G,N8931A,E3634A,U1233A,3052T,N2783B,P9371A,N2795A,N5772A,6813C,E3649A,6800C,6812C,N6753A,N8758A,U1460A,N6741B,U1242C,N8734A,U1242B,N8952A,N6777A,N8940A,N6765A,P9370A,N2891A,N2782B,EPM SERIES,53181A,N5761A,34931A-33A,34465A,E3648A,4054A,N8759A,N6764A,U1231A,U1461A,N6752A,E9320,83020A,N8735A,N8941A,N6776A,N2793A,DAQ970A,N2890A,L2060,N2781B,U1240C,N9914A,82350C,N5750A,N5762A,U2063,E5810B,N8934A,N6743B,N9926A,P1912A,N8946A,N6731B,N9938A,U1252B,E3643A,E3631A,N6755A,14585A,N2792A,N2780B,U1241C,N5763A,E4980AL,N5751A,E36300,E9300,N8923A,N9915A,N8935A,N6742B,N9927A,E3630A,U1241B,4052A,U1253B,E3642A,N6766A,34908A,N6754A,N2791A,N9912A,N8738A,N9936A,U1190,U2040,N5752A,N5764A,34450A,DAQM907A,N8932A,N8944A,34907A,N8920A,E3645A,N6745B,E3633A,N6733B,L2050,N2790A,U1251B,N8739A,N9913A,N9925A,N5741A,DAQM908A,N5765A,34461A,U2053,N8945A,N6732B,N9937A,N8957A,N8921A,E3632A,E3620A,N6756A,E3644A,N6744B

选型指南 - KEYSIGHT - November 2018 PDF 英文下载

Keysight（是德科技）频谱分析仪和信号分析仪选型指南

目录- Spectrum Analyzer and Signal Analyzer Product Introduction Benchtop spectrum and signal analyzers Modular Signal Analyzer Handheld Signal Analyzer Applications and Measurement Software

型号- M9393A,8560E,M9391A,N934XC,8562E,N934XB,8562EC,8561EC,8560EC,N9936A,N9914A,N9342C,859XB,N9320B,8565EC,859XC,8564EC,N9340B,8563EC,859XA,N9322C,N9344C,N991XA-233,N9040B,U2020,N993XA,N9938A,N9916A,HP8568,N9918A,HP8566,8561E,8563E,N9935A,N9913A,8565E,N9343C,X-SERIES,N9030A,N9020A,N9010A,N9000A,N9937A,N9915A,89600,N9917A,M9290A

选型指南 - KEYSIGHT - March 12, 2018 PDF 英文下载

PathWave Vector Signal Analysis (89600 VSA)

型号- 89604C,89601PSMC,89602C,89601BHQC,89601DVBC,89601CC1C,89600 VSA,89601AYAC,89601BHMC,89601B7RC,89601BHGC,89603C,89601CC2C,89601BHXC,89601CSDC,89601B7NC,89601BAXC,89601C,89601BHPC,89601BHTC,89601BHHC,89601BHNC,89601200C,89601101C,89601EVMC,89601301C,89601BHFC

商品及供应商介绍 - KEYSIGHT - September 29, 2023 PDF 英文下载查看更多版本

Keysight（是德科技）信号发生器选型指南（英文）

目录- Signal Generator Agile and Vector Signal Generators Analog Signal Generators Signal Studio Software PSG Signal Generators X-Series Signal Generators RF Analog Signal Generator Baseband Generator,Interface Module PXI Signal Generators Legacy Signal Generators

型号- 8657J,N5172B,E4425B,E4437B,8657D,8645A,8657B,8657A,ESG-D,8672A,N5173B,E4424B,E4436B,8644B,8656B,E4400B,E8257DSXX-SERIES,83620B,ESG-A,83620A,M9381A,8340B,8340A,N5106A,E4431B,8647A,N9310A,8648A,83712B,83712A,ESG-AP,E4430B,83752B,83752A,M9380A,83630L,N5191A,8662B,E8257D,8662A,E4438C,E4426B,E2500B,83711B,83711A,83630B,83751B,83751A,8665A,8665B,E4421B,E4433B,N5193A,83640L,N5181B,8341A,N5181A,8341B,E8663D,8664A,E4428C,E4420B,8648D,E4432B,8648B,E8267D,8648C,83624B,83624A,83640B,N5194A,8780A,N5182B,N5182A,83623L,E4435B,8643A,N5102A,E4423B,83732B,83623B,83732A,83650L,N5171B,N5183B,8763D,N5183A,8763B,8763C,E8257DVXX-SERIES,X-SERIES,8763A,E4422B,E4434B,83622B,83731A,ESG-DP,83622A,83650B,83731B

选型指南 - KEYSIGHT - June 1, 2018 PDF 英文下载

Millimeter Wave Frequency Extenders:From Virginia Diodes Inc. for the Keysight X-Series Signal Analyzers TECHNICAL OVERVIEW

型号- WR1.0,WR1.5,WR5.1,N9029AV2B,WR3.4,WR10,N902AV2B,WR12,WR15,WR2.2SAX,WR10SAX,WR1.5SAX,N9029AV1B,E8267D,WR2.8,WR6.5,N9029AV15-BF2,N9029AV15-BF3,N9029AV15-BF1,N9029AV15,N9029AV15-BF4,N9029AV15-BF5,N9029AV10,N9029AV12,N9029AVXX-UDC,N9029AV12-BF4,N9029AV12-BF3,N9029AV12-BF2,WR6.5SAX,N9029AV12-BF1,N9029AH12,WR2.2,N9029AH15,WR4.3,N9029AH10,WR8.0,WR1.0SAX,WR2.8SAX,M8190A,N9029AV08,N9029AV03,WR8.0SAX,N9029AV05,N9029AV06,WR15SAX,N9029AVXX,N9029AV01,N9029AV02,WR3.4SAX,N9029AH05,N9029AH08,WR12SAX,WR5.1SAX

商品及供应商介绍 - KEYSIGHT - April 3, 2020 PDF 英文下载

MXG X-Series Signal Generator N5181B Analog & N5182B Vector 9 kHz to 3 or 6 GHz 9 kHz to 7.2 GHz DATA SHEET

型号- MXG X,N5181B,N5182B,MXG X-SERIES

数据手册 - KEYSIGHT - February 27, 2023 PDF 英文下载

MXG X-Series Signal Generator N5183B Microwave Analog CONFIGURATION GUIDE

型号- N5183B-1ED,E8257D-V08,N5183BU-UW2,E8257D-V06,E8257D-V05,PS-X10,N5172B,N5183B-513,N5183B-1EM,N5183B-AMG,N5183A-1ED,N5183B-1ER,N5183A-HNS,N5183A-1EA,N5183A-540,E8257D-V03,E8257D-V02,E8257D-V01,N5183B-UZ2,N5183A-1E1,N5183BU-006,N5183A-UNZ,N5183B-520,N5181B,N5183B-006,E8257D-V15,N5183BU-UZ2,N5173B,E8257D-V1B,PS-T10-ASG,PS-S20,N5183B-CVR,N5183A-532,1CM110A,N5183BU-1ER,N5183A-UNT,N5183B-UNC,E8257D-V12,E8257D-V10,N5183A-UNW,N5183B-UW2,R-50C-011-10,PS-S10,N5183B-532,N5183B-A6J,N5182B,N5180320B,N5183BU-1EA,N5183B-UNT,E8257D-V2B,N5183B-UNW,1CN106A,N5183BU-0BW,1CR112A,N5183A-520,N5183B-UNY,N5183B-UK6,N5183B-UNZ,N5173BU-1E1,N5183BU-AXT,N5183A-006,N5183BU-303,N5183B-CD1,N5183B-540,N5183BU-CD1,N5171B,N5183B,N5183B-303,X-SERIES,R-50C-011-5,N5183B-1E1,N5183B-AXT,R-50C-011-7,N5183A-HNZ,N5183BU-UNZ,N5183BU-UK6,N5183B-0BW,N5183BU-UNW,N5183BU-UNT,N5183A-1EM,N5183B-1EA,1CM104A,N5183A-1ER

用户指南 - KEYSIGHT - January 30, 2019 PDF 英文下载

Keysight（是德科技）汽车测试产品选型指南（英文）

目录- Increasing Speed, Safety, and Reliability of In-Vehicle Communications Networks Data Acquisition for Accurate Automotive System Analysis Taming the Hostile RF World of Today’s Vehicles Managing Power in a Harsh Automotive Electrical Environment EMI Pre-Compliance Testing for Automotive Designs Handheld Instruments for Accurate Portable Automotive Testing General Bench Test and Accessories Test Automation with PathWave BenchVue Software

型号- N7026A,DAQ970A,4000 X,N2790A,N6705C,N5166B CXG,N6700 SERIES,3000T X-SERIES,N6700,3000T X,34980A,S-SERIES,6000 X,N9000B CXA,N7900,4000 X-SERIES,MSOX4154A,6000 X-SERIES,N7900 SERIES

选型指南 - KEYSIGHT - October 31, 2022 PDF 英文下载