International Civil Aviation Organization ACP-WG S Webmeeting06 / WP01 WORKING PAPER AERONAUTICAL COMMUNICATIONS PANEL (ACP) 6th WEB MEETING OF THE WORKING GROUP S (Surface) 2 June, 2014 Spectrum Mask Measurement Methods and Results for AeroMACS Presented by Yasuto Sumiya Prepared by Naoki Kanada, Kazuyuki Morioka, Yasuto Sumiya, Naruto Yonemoto, Akiko Kohmura, Shunichi Futatsumori, Makoto Shioji and Takeshi Tomita Electronic Navigation Research Institute (ENRI) / Japan SUMMARY This paper describes spectrum mask measurement based on the current AeroMACS draft SARPs. Current description of the spectrum mask in AeroMACS draft SARPs has unclear and incompleteness. A unique and clear description is necessary. ACTION The ACP WG-S is invite to recognize the problems and modify the spectrum mask definition in current AeroMACS draft SARPs. 1. INTRODUCTION 1.1 ENRI have developed AeroMACS Prototype System in our R&D program since FY2013. We finished developing our mobile station (MS) of AeroMACS prototype system on the end of FY2013. 1.2 We checked the current AeroMACS draft SARPs using our MS. This paper describes some issues in the session of spectrum mask on the draft SARPs. 2. CURRENT SPECTRUM MASK AND ISSUES 2.1 Spectrum Mask in current AeroMACS draft SARPs is defined as follows: 3.5.1 The power spectral density of the emissions must be attenuated below the output power of the transmitter as follows: a) On any frequency removed from the assigned frequency between 0-45% of the authorized bandwidth (BW): 0 dB. b) On any frequency removed from the assigned frequency between 45-50% of the authorized bandwidth: 568 log (%of (BW)/45) dB. (9 pages) Document1 ACP-WGS Webmeeting06 / WP01 -2- c) On any frequency removed from the assigned frequency between 50-55% of the authorized bandwidth: 26 + 145 log (% of BW/50) dB. d) On any frequency removed from the assigned frequency between 55-100% of the authorized bandwidth: 32 + 31 log (% of (BW)/55) dB. e) On any frequency removed from the assigned frequency between 100-150% of the authorized bandwidth: 40 +57 log (% of (BW)/100) dB. f) On any frequency removed from the assigned frequency between above 150% of the authorized bandwidth: 50 dB. g) The zero dB reference is measured relative to the highest average power of the fundamental emission measured across the designated channel bandwidth using a resolution bandwidth of at least one percent of the occupied bandwidth of the fundamental emission and a video bandwidth of 30 kHz. The power spectral density is the power measured within the resolution bandwidth of the measurement device divided by the resolution bandwidth of the measurement device. Emission levels are also based on the use of measurement instrumentation employing a resolution bandwidth of at least one percent of the occupied bandwidth. 2.2 There are 3 issues for the spectrum mask. (1) The 0 dB reference level definition (2) Settings for measurement (3) Item a) : 47% bandwidth is necessary for downlink transmission 3. ACTION BY THE MEETING 3.1 ACP WG-S check presence of the other mobile stations complied with current spectrum mask of the draft SARPs. 3.2 ACP WG-S is invited to recognize the issues and modify the spectrum mask definition in current AeroMACS draft SARPs. 4. REFERENCES [1] ICAO: “Draft AeroMACS SARPs”, ICAO ACP WGS Webmeeting3 WP01, March 2014 [2] IEEE 802.16-2009 “IEEE Standard for Local and metropolitan area networks Part 16: Air Interface for Broadband Wireless Access Systems,” May 2009 [3] K. Morioka, N. Kanada, Y. Sumiya, N. Yonemoto, A. Kohmura, S. Futatsumori, M. Shioji and T. Tomita: “Preliminary Evaluation for AeroMACS Prototype Mobile Station,” 17th meeting of EUROCAE WG82, May 2014 -3- ACP-WGS Webmeeting06 / WP01 ATTACHMENT A ISSUES FOR SPECTRUM MASK We describe some examples about 3 issues for spectrum mask as follows: 1.1 The 0 dB reference level definition in Item g). 1.1.1 Which level is “Highest average power” ? Figure A-1. Example of Multiple meaning of “Highest average power” 1.1.2 “At least one percent of the occupied bandwidth” include 50kHz and 5MHz Figure A-2. Example of Multiple meaning of “at least one percent” ACP-WGS Webmeeting06 / WP01 1.2 -4- Settings for measurement. Multiple Measurement condition makes multiple measurement results. Figure A-3. Example of Difference from Measurement Condition under Same Spectrum Mask 1.3 Item a) : 47% bandwidth is necessary for downlink fundamental emission. Fundamental emission requires for DL signal bandwidth of BS (4.69MHz) Figure A-4. Emission Requirements for Exceed of BS Downlink Signal -5- ACP-WGS Webmeeting06 / WP01 ATTACHMENT B RESULTS OF ANALYSIS USING OUR AEROMACS PROTOTYPE MS 1. MEASUREMENT SYSTEM AND CONFIGURATION FOR PROTOTYPE AEROMACS MOBILE STATION 1.1 Figure B-1 shows the appearance of our Mobile Station (MS). There are two antenna connectors on the top of the MS. One is main antenna for Tx and Rx and the other is diversity antenna for Rx. The MS is connected to Laptop PC (user terminal) by USB cable. Specifications of the MS are shown in Table B-1. We can transmit the signal shown in Table 1 to the base station. Figure B-1. AeroMACS Prototype MS (Manufactured by Hitachi, Ltd.) Table B-1. Specifications of AeroMACS MS Item Frequency Channel Bandwidth Subcarrier Spacing Standards Transmission Method Modulation Frame Length Maximum Output Power Size (mm) Weight Specification Center Frequency: 5093.25~5147.5MHz, 250kHz step 5MHz bandwidth (FFT size =512) 10.94 kHz PHY-MAC: IEEE P802.16 Rev2/D3, Feb 2008 OFDMA, Time Division Duplex (TDD) Primary modulation: QPSK, 16QAM, and 64QAM Secondary modulation: OFDMA 5 ms +23dBm(200mW) 175 (W) x 122 (D) x35.5 (H) 360g (excluding antenna weight) 1.2 A system for spectrum the mask measurement is shown in the Figure B-2. A block diagram of the measurement system is shown in the Figure B-3. In the Figure B-3, a red frame is the prototype AeroMACS Mobile Station and a blue frame is Agilent E6651A WiMAX test set. The WiMAX test set is connected to the Prototype AeroMACS Mobile Station by mixing its antenna terminals. WiMAX Test Set is operated in SISO (Single-Input Single-Output) configuration. Output of the WiMAX test set is configured to -50dBm, and output of the mobile station is set to +23dBm. Vector Spectrum Analyzer (VSA) FSQ26 is connected via circulators and dual directional coupler in order to evaluate the -6- ACP-WGS Webmeeting06 / WP01 signal from the Prototype AeroMACS Mobile Station and in order to avoid the influence of the signal from the WiMAX test set. 20 dB fixed attenuator is inserted before VSA to reduce distortion. Measurement is done in the anechoic chamber in order to avoid the influence of external noise. Power source is supplied through a noise cut transformer. Prototype AeroMACS Mobile Station Dual Directional Coupler Agilent E6651A WiMAX Test Set Agilent 87300C Directional Coupler 3dB H-Coupler Power Sensor R&S FSQ26 Figure B-2. Measurement System Overview Prototype AeroMACS Mobile Station Div HRS HDH-06003GH(40) Main Agilent 87300C Directional Coupler 3dB H-Coupler Advanced Technical Materials ATc3-6 Circulators RF 1 -10dB RF 2 Agilent 8491B 10dB ATT Agilent 772D Dual Directional Coupler -20dB Agilent E9323A Power Sensor Agilent E4417A Power Meter Agilent E6651A WiMAX Test Set Agilent 8491B 20dB ATT ROHDE&SCHWARZ FSQ26 Vector Signal Analyzer Figure B-3. Measurement System Block Diagram Table B-2. Measurements Configurations Frequency SPAN: Resolution Bandwidth (RBW): Video Bandwidth (VBW): Sweep Points: Sweep Time: Sweep Mode: Detector: Trace: Mobile Station Output Power: 1.3 development. 20 MHz 10 kHz (~ OFDM Subcarrier Step) 30 kHz 1001 5 sec. (Frame Length 5ms for each 1001 sweep points) Continuous Max Peak Max Hold +23dBm This measurement is done only for mobile stations. Base stations are currently under -7- 2. ACP-WGS Webmeeting06 / WP01 MEASUREMENT RESULTS 2.1 The spectrum mask of AeroMACS is defined relatively. Therefore, item g) of the mask, definition for 0 dB reference, decides the spectrum mask. In the following measurement,modified item g’) “0dB reference is defined as the maximum peak of the spectrum.” 2.2 Measurement results are shown in the Figure B-4. Device Under Test (DUT) is our mobile station No.1. Center frequency is 5120 MHz. Uplink modulations are 16QAM and QPSK. Red line shows the spectrum mask defined in AeroMACS draft SARPs. In these cases, measured spectra consistent with the mask and the mobile station No.1 complies with the spectrum mask. 0 0 5120MHz 16QAM ATT=20dB, RBW=10K -10 -20 -20 -30 5120MHz 16QAM -40 Emission Mask (SARPs draft) -50 -60 Power (dBm) Power (dBm) -30 5120MHz QPSK -40 -60 -70 -80 -80 Frequency (Hz) -90 Emission Mask (SARPs draft) -50 -70 Frequency (Hz) -90 5.130E+9 5.128E+9 5.126E+9 5.124E+9 5.122E+9 5.120E+9 5.118E+9 5.116E+9 5.114E+9 5.112E+9 -100 5.110E+9 5.130E+9 5.128E+9 5.126E+9 5.124E+9 5.122E+9 5.120E+9 5.118E+9 5.116E+9 5.114E+9 5.112E+9 5.110E+9 -100 5120MHz QPSK ATT=20dB, RBW=10K -10 Figure B-4. Spectrum measurement results and mask of the mobile station No.1 2.3 The other measurement results are shown in the Figure B-5. DUTs are mobile station No. 3 in the left graph and No. 4 in the right graph. Center frequency is 5095 MHz. Uplink modulation is QPSK. Gray lines show the measurement results. Red lines show the spectrum mask defined in AeroMACS draft SARPs. In this case, the maximum excess for No.3 mobile station is 1.19 dB at 5092.16 MHz and the maximum excess for No.4 is 0.16 dB at 5097.86 MHz. -8- ACP-WGS Webmeeting06 / WP01 0 0 5095MHz QPSK AeroHi13 ATT=20dB, RBW=10K -10 -20 -20 -30 -30 5095MHz QPSK AeroHi13 Emission Mask (SARPs draft) -60 Power (dBm) Power (dBm) -40 -50 -40 5095MHz QPSK AeroHi14 -50 -70 -80 -80 -90 Frequency (Hz) Frequency (Hz) 5.105E+9 5.103E+9 5.101E+9 5.099E+9 5.097E+9 5.095E+9 5.093E+9 5.091E+9 5.089E+9 5.087E+9 5.085E+9 -100 5.105E+9 5.103E+9 5.101E+9 5.099E+9 5.097E+9 5.095E+9 5.093E+9 5.091E+9 5.089E+9 5.087E+9 5.085E+9 -100 Emission Mask (SARPs draft) -60 -70 -90 5095MHz QPSK AeroHi14 ATT=20dB, RBW=10K -10 Figure B-5. Spectra measurement results 2.4 We discuss effects of changing measurement conditions. Measurement results in different RBWs in the Figure B-6. RBW = 50 kHz (This value is chosen as “at least one percent of the occupied bandwidth of the fundamental emission” in spectrum mask item g). ) and VBW = 30 kHz is drawn in gray lines in the Figure. RBW = 10 kHz and VBW = 30kHz is drawn in blue lines in the Figure. Red lines show the spectrum mask defined in draft SARPs. In these cases, gray lines exceed the mask and blue lines comply with the mask. 0 0 -6.816319 5120MHz QPSK ATT=20dB, RBW=10K +50K -10 -16.81632 -10 -26.81632 -20 -7.339619 5120MHz 16QAM ATT=20dB, RBW=10K +50K -17.33962 Power (RBW=50K) -20 Power (RBW=50K) Emission Mask (SARPs draft) Power (RBW=10K) -30 -60 -66.81632 -70 -80 -90 -37.33962 Abs Mask (RBW=10K) -40 -47.33962 -50 -57.33962 -60 -67.33962 -76.81632 -70 -77.33962 -86.81632 -80 -87.33962 -96.81632 -90 -97.33962 Frequency (Hz) Frequency (Hz) -106.8163 -107.3396 5.130E+9 5.128E+9 5.126E+9 5.124E+9 5.122E+9 5.120E+9 5.118E+9 5.116E+9 5.114E+9 5.112E+9 -100 5.110E+9 5.130E+9 5.128E+9 5.126E+9 5.124E+9 5.122E+9 5.120E+9 5.118E+9 5.116E+9 5.114E+9 5.112E+9 5.110E+9 -100 Power (RBW=10K) -56.81632 Power (RBW=50K) -50 Power (RBW=10K) Power (RBW=50K) -46.81632 Power (RBW=10K) -30 -36.81632 Abs Mask (RBW=10K) -40 -27.33962 Emission Mask (SARPs draft) Figure B-6. Comparison results of RBW = 50 kHz and 10 kHz for the mobile station No.1 2.5 Our prototype mobile stations satisfy the spectrum mask in many cases. However, in some cases, the mobile stations exceed the mask. Compliance also depends on the measurement conditions. -9- 3. ACP-WGS Webmeeting06 / WP01 CONCLUSIONS 3.1 and uniquely. The 0 dB reference level definition in the spectrum mask should be defined absolutely 3.2 draft SARPs. Measurement conditions and parameters should be described in a technical manual of the 3.3 Spectral mask in draft SARPs should be described clearly to avoid misreading. Especially, it is necessary to amend a text of item g) because the text may cause confusion. 3.4 94% bandwidth is necessary for downlink fundamental emission. ***END***