1、 STD.CEPT ERC REPORT 63-ENGL L77 2326414 00L380b 40T M ERC REPORT 63 European Radiocommunications Committee (ERC) within the European Conference of Postal and Telecommunications Administrations (CEPT) INTRODUCTION OF RADIO MICROPHONE APPLICATIONS IN THE FREQUENCY RANGE 1785 - 1800 MHz Sifok, May 199
2、8 STDOCEPT ERC REPORT b3-ENGL 1998 2326414 0013807 3ib ERC REPORT 63 Copyright 1998 the European Conference of Postal and Telecommunications Administrations (CEPT) STD*CEPT ERC REPORT b3-ENGL 1998 232b414 0013808 282 = ERC REPORT 63 INTRODUCTION OF RADIO MICROPHONE APPLICATIONS IN THE FREQUENCY RANG
3、E 1785 - 1800 MHz 1 INTRODUCTION . 1 2 BASIC PARAMETERS 1 2.1 SYSTEM PARAMETERS . 1 2. I. I GSM 1800 . 1 2.1.2 Tactical radio re1 ay. . 3 2.1.3 TFTS 5 2. I. 4 Radio microphones . . 6 2.2 WANTED FIELD STRENGTH FOR RADIO MICROPHONES USING DIGITAL MODULATION . 7 2.3 RESULTS OF COMPATIBILITY ANALYSES .
4、. 8 2.4 OVERVIEW OF RESULTS 9 2.4. I Results porn the viewpoint of the other services uflected (i. e. microphones (is the interferer) . Y 2.4.2 2.4.3 Combined results . 9 RESULTS OF THE COMPATIBILITY ANALYSES 10 Results from the viewpoint of radio microphones ( .e. other services as the interferer)
5、9 3 4 CONCLUSIONS . 1 I ANNEX 1 MICROPHONE RECEIVER MASK 13 STD.CEPT ERC REPORT 63-ENGL 1998 232b414 0033809 119 ERC REPORT 63 STD=CEPT ERC REPORT b3-ENGL 1998 = 232b424 00138LO 930 = ERC REPORT 63 INTRODUCTION OF RADIO MICROPHONE APPLICATIONS IN THE FREQUENCY RANGE 1785 - 1800 MHz SUMMARY This stud
6、y considerd the compatibility between radio microphones and tactical radio relay systems in the frequency range 1785 - 1800 MHz taking account of the use of the adjacent bands by GSM 1800 (1 7 1 O - 1785 MHz) and TFTS (1 800 - 1805 MHz). The main results of this work are that the operation of radio
7、microphones within the frequency range 1785 - 1800 MHz is feasible provided that: a guard band of 700 kHz is implemented to avoid compatibility problems between radio microphones and GSM i 800 (Le. a guard band of 600 kHz is implemented to provide protection against interference from TFTS emissions
8、from airborne stations (.e. 1799.4 - 1800 MHz); coordination is needed to ensure a 200m separation distance between radiomicrophones and TFTS ground stations in the band 1797 - 1799.4 MHz, and use at airports (with TFTS in operation) should be prohibited; Co-channel sharing with tactical radio relay
9、 is feasible provided a separation distance of 1.4 - 2.8 km is observed, this can be achieved through a national licensing/coordination mechanism. 1785 - 1785.7 MHz); the radiated power of the radio microphones is restricted to 10 dBm (17 dBm for body - worn equipment) to minimize interference to ta
10、ctical radio relay systems. These conditions are achievable through a national licensing procedure; this would be necessary in any case for professional radio microphone usage to avoid intra-service interference. For analogue radio microphones the standard ETS 300 422 is applicable; however, if digi
11、tal equipment were to be developed then a new standard would be required. STD-CEPT ERC REPORT 63-ENGL 1998 232bq14 OOL381l 877 ERC REPORT 63 STDvCEPT ERC REPORT 63-ENGL 1S = 232bLil1i-i 0013BlZ 703 A f (Wz) 200 250 400 600 -1200 1200 -1800 Power level (dBc) - 30 - 33 - 60 - 60 - 60 ERC REPORT 63 Pag
12、e 1 1800 -6000 2 6000 - 71 - 79 1 INTRODUCTION A f (Wz) 400 600 Power level (dBm) -23 -26 The aim of this study is to investigate the possibility of using the frequency range 1785 - 1800 MHz for radio microphones. For this purpose some compatibility considerations have been done. 1200 1800 -32 -36 T
13、he radio microphones considered in this study are professional applications. Therefore the stringent requirements for broadcast quality are taken into account. Radio microphones are assumed to be operated mainly indoors, although outdoor use is not prohibited. This document describes the prerequisit
14、es for the introduction of radio microphones in the aforementioned tiequency range. 2 BASIC PARAMETERS 2.1 System parameters 2.1.1 CSM 1800 Source: Draft prETS 300 577 (GSM 05.05), May 1995 General parameters: Frequency band: Modulation: Transmission method: Carrier spacing: Channels: Mobile transmi
15、tters: Output power: 1710 - 1785 MHz GMSK TDMA 200 kHz Fu = I710 + 0.2 (n-512) where 512 I n I885 max. 1 W (30 dBm) f 2.5 dB min. 0.25 W (24 dBm) f 2.5 dB micro station 1 mW (O dBm) f 6 dB Level of spurious emissions given an output power of 1 W: Draft prETS 300 577, page 13, Table b) Intermodulatio
16、n attenuation: Feeder loss (cable loss): 50 dB at 800 kHz (fl-Q) from the carrier 2 dB Antenna gain: -2 dB STDOCEPT ERC REPORT b3-ENGL 1998 2326414 0013813 64T = Type designation Level (dBm) ERC REPORT 63 Page 2 Normal BTS BTS M1 BTS M2 BTS M3 (equivalent to 33 dB(pV/m) -104 -102 -97 -92 Fixed recei
17、vers: Receiver sensitivitv: A f (kHz) Power level (dBc) f200 +400 I600 -9 -4 1 -49 Co-channel rejection: 9 dB Maximum permissible interference levelshterfering field strength levels: Normal BTS: BTS M1: BTS M2: BTS M3: -1 13 dBm = 24 dB(pV/m) - 1 1 1 dBm = 26 dB(pV/m) -106 dBm = 3 1 dB(pV/m) -101 dB
18、m = 36 dB(pV/m) Blocking level dBm) Adjacent channel rejection: Af (kHz) 600 i: 800 I800 5 3000 Normal BTS M1 M2 M3 At dBc: Frequency offset from the centre frequency of the wanted signal Level relative to the wanted signal -3 5 -2 5 -40 -30 -3 5 -25 -30 -2 o Out-of-band blocking performance: O dBni
19、 Spurious emissions: Antenna gain: Feeder loss (cable loss): Average antenna height: Side lobe attenuation: Measurement bandwidth: see draft prETS 300 577, page 17 2 nW (-57 dBm) in the band 9 kHz - 1 GHz 20 nW (-47 dBm) in the band 1 - 12.75 GHz 18 dBi 2 dB 25 m 14 dB STDOCEPT ERC REPORT 63-ENGL 17
20、98 2326434 0013834 586 Transmission capacity 256J288 kbits 5 12/576 kbits ERC REPORT 63 Page 3 Bandwidth 600 kHz 980 kHz 2.1.2 Tactical radio relay Channel mode 12-channel operation 24-channel operation Source: National Radio Frequency Agency (NARFA), Germany System value 2 159 dB 2 154dB General pa
21、rameters: Frequency band: System designation: Modulation mode: Operation mode: Frequency spacing: Transmission capacity 2561288 kbits 5 12/576 kbits 10241 1 1 52 kbits Transmission range: Fade margin: System gain 2 128dB 2 127 dB 2 119dB Transmitters: Output power: OccuDied bandwidths for TDM oDerat
22、ion: 1785 - 1800 MHz FM 1000 FM FDM or TDM FDM: 125 kHz TDM: see occupied bandwidths Approx. 20 dB 50-60 km FDM and TDM 1.25 W (I dBW) I 102411 i52 kbits I 1030 kHz I Maximum system values: TDM oDeration (BER = 10-4): Wanted and out-of-band emissions: A f (kHz) 515 I1030 2060 I 2500 - 5000 Level dBc
23、) I O I - 50 1-60 I - 60 Afi dBc: Frequency offset from the centre frequency of the wanted signal Level relative to the wanted signal General value of spurious emissions: - 30 dBm STD *CEPT Bandwidth approx. 125 kHz (FDM) 600 kHz (TDM) 980 kHz (TDM) 1030 kHz (TDM) ERC REPORT 63 Page 4 Pn = 10 log (k
24、*“*B) + F -145 dBW -138 dBW -136 dBW -136 dBW Antenna hwe I Location of use: Gain: Side lobe attenuation: Front-to-back ratio: wo-4 PIO-7 ERC REPORT b3-ENGL L9W 232b414 OOL3815 412 Binary transmission: 12 dB Biternary transmission: 15 dB Binary transmission: 15 dB Primarily on manoeuvres 19.5 - 22 d
25、Bi 2 9 dB 2 18dB A f (kHz) Power level (dBc) Voltage standing wave ratio (VSWR): 22.0 dB 515 1034 2060 3000 4000 4500 O 3 3 40 60 80 Antenna tvrie 2 Location of use: Applications other than manoeuvres Gain: 2 22 dBi Side lobe attenuation: 2 25 dB Polarisation: Horizontal and vertical Polarisation at
26、tenuation: 2 30 dB Front-to-back ratio: 2 30 dB Voltage standing wave ratio (VSWR): 5 2.0 dB Both wries of antenna Antenna heights: Feeder loss (cable loss): Receivers: Noise figure: 17-30 m 2 dB F28dB C/N ratios for TDM: Bit error ratio (BER) I c/N 1 I Biternary transmission: 18 dB I Receiver sensi
27、tivity: Antennas: -88 dBm (average level) Identical to transmitting antenna characteristics STD-CEPT ERC REPORT h3-ENGL 1778 2326434 0033836 357 Frequency offset from the carrier (kHz) k 11.3 ERC REPORT 63 Page 5 Relative level (dBc) +1 2.1.3 TFTS Sources: ETS 300 326 1-3 I 30 I60 k 120 General uara
28、meters: Frequency band: Upper band: RF channel arrangement: RF channel number: General RF channels: -3 7 -49 -65 No. of speech channels per RF channel: Frequency band 9 kHz - 1 GHz 1 GHz- 12.75 GHz Modul a ti on : Speech channel: RF channel: Gross data rate: Maximum power (peak power (PX) at the ant
29、enna port -36 dBm -30 dBm Airborne transmitter: Type Aircraft station 1800 - 1805 MHz (TX: airborne station; RX: ground station) 1/33 MHz = 30.30 kHz n = 1-164 Fa(n) = Fg(n) + 130 MHz Fa = airborne transmit channel where Fg(n) = 1670 MHz + 11/33 MHz 4 TDMA 7d4 DQPSK 44.2 kbiis Location of use Transm
30、it power/tolerance On board aircraft 40 dBm/i 2 dB -1 dB (Transmit power corresponds to mean power (PY).) Irt 14.5 1-20 I II 15.6 1-35 I 1-70 I Antenna gain i dBi Intermodulation attenuation: Feeder loss (cable loss): See relevant type approval specification 2 dB STD.CEPT ERC REPORT b3-ENGL 3998 = 2
31、32b434 0033837 295 Frequency offset from the wanted signal in (kHz) O 30.30 ERC REPORT 63 Page 6 CA Bit error ratio (dB) (BER) 20 5.0 10-3 -20 5.0 10-3 Ground station receivers: a) Without interferer Receiver input sensitivity -105 dBm -1 12 dB b) With adjacent interferer BER 1 km are necessary. ITU
32、-R P.529-2, Hata model 1980; interpolated (suburban) Application: Analysis of compatibility between radio relay systems and radio microphones where separation distances 1 km are necessary. Interpolation between free space propa-gation for 100 m and Hata value (suburban) for 1 km. See Annex 1 for a g
33、raphical representation. This “model“ has not been verified. It was chosen because no other suitable model is currently available for distances of less than 1 km. 2.2 Some additional details are required in connection with the wanted field strength values of digital microphones. The minimum wanted f
34、ield strength for a digital receiver with a sensitivity of - 103 dBm (39 dB(pV/m) and a required C/I of 18 dB was assumed to be 57 dB(pV/m). In view of the transmitter powers now specified for hand-held and body worn devices a coverage radius of approximately 500 m would be possible. In this case th
35、e maximum permissible interfering field strength would be 39 dB(pV/m). Wanted field strength for radio microphones using digital modulation If the same receiver is assumed but the coverage radius is reduced to 150 m, the wanted field strength is 68 dB(pV/m) and the permissible interfering field stre
36、ngth increases to 50 dB(pV/m). The latter value corresponds virtually to that of an analogue radio microphone. However, it should be borne in mind that analogue radio microphones have a coverage radius of only about 70 m. This means that whilst maintaining an identical maximum permissible interferin
37、g field strength the coverage radius of 70 m of an analogue radio microphone can be more than doubled to 150 m by using a digital radio microphone. The results of compatibility analyses of analogue and digital radio microphones with a coverage radius of 150 m are therefore identical. The results obt
38、ained for digital radio microphones with a minimum wanted field strength are given in Section 2.3. However, operation based on a minimum field strength in the frequency ranges shared with radio relay applications leads to considerable separation distances and should therefore be avoided where possib
39、le. STD.CEPT ERC REPORT b3-ENGL 1778 H 232b414 0013819 Ob8 ERC REPORT 63 Page 8 2.3 Results of compatibility analyses Microphone interferes with GSM 1800: for a separation distance of 1 O m a frequency separation of 700 IrHz is required; this applies to hand held and body worn devices, analogue and
40、digital (BTS) GSM 1800 (MS) interferes with: microphone for a separation distance of 25 m a frequency separation of 300 kHz is required; this applies to hand held and body worn devices, analogue and digital Microphone interferes with tactical radio relay: (side lobe suppression radio relay antenna t
41、ype 1 = 9 dB) separation distance (Hata model) separation distance (Hata model) hand held separation distance (free space propagation) 14.9 km body worn separation distance (free space propagation) 13.3 km S 1 km 5 1 km Microphone interferes with tactical radio relay: (side lobe suppression radio re
42、lay antenna type 2 = 25 dB) hand held separation distance (free space propagation) 2.4 km separation distance (Hata model interpolated) 420 m body worn separation distance (free space propagation) 2.1 km separation distance (Hata model interpolated) 380 m Radio relay interferes with microphone: (sid
43、e lobe suppression radio relay antenna type 1 = 9 dB) separation distance (free space propagation) 33.28 km separation distance (Hata model) 1.4 km separation distance (free space propagation) 105 km separation distance (Hata model) 2.8 km analogue m./digital m. 150 m digital microphone 500 m (The v
44、alues of 33.28 km and 105 km for free space propagation are unrealistic because with an antenna height of 30 m the radio horizon is already reached at 19.6 km.) Radio relay interferes with microphone: (side lobe suppression radio relay antenna type 2 = 25 dB) separation distance (free space propagat
45、ion) 5.92 km separation distance (Hata model interpolated) 610 m separation distance (free space propagation) 14.86 km separation distance (Hata model interpolated) 950 m analogue m./digital m. 150 m digital microphone 500 m Microphone interferes with TFTS: (En route/Intermediate/Airport) TFTS inter
46、feres with microphone: for a separation distance of 50 m a frequency separation of 3 MHz is required; this applies to hand held and body worn devices, analogue and digital for a separation distance of 80 m a frequency separation of 600 kHz is required; this applies to hand held and body worn devices
47、, analogue and digital. ERC REPORT 63 Page 9 Service Frequency range 2.4 Overview of results Tactical Microphones Tactical TFTS GSM 1800 radio relay Tactical radio relay radio relay 1710 - 1785 MHz 1785.0- 1785.7 MHz 1785.7 - 1797.0 MHz 1797.0 - 1800 MHz 1800 - 1805 MHz Separation distance I 10 m Ca
48、. 1 km 50 m 2.4.2 Results from the viewpoint of radio microphones (i.e. other services as the interferer) service frequency range GSM 1800 Tactical Microphones Tactical radio relay Tactical radio relay radio relay 1710 - 1785 MHz 1785.0 - 1785.3 MHz 1785.3 - 1799.4 MHz 1799.4 - 1800 MHz separation d
49、istance I 10 - 25 m TFTS 1 1.4 - 2.8 km 2.4.3 Combined results Service Frequency range GSM 1800 Tactical Microphones Tactical TFTS radio relay Tactical radio relay radio relay 1710 - 1785 MHz 1785.0 - 1785.7 MHz 1785.7 - 1797.0 MHz 1797.0 - 1800 MHz 1800- 1805 MHz Separation distance I 10 - 25 m 1.4 - 2.8 km 50 m STDICEPT ERC REPORT 63-ENGL 1998 2326434 0013821 7Lb D ERC REPORT 63 Page 10 3 RESULTS OF THE COMPATIBILITY ANALYSES The adjacent channel analyses regarding GSM 1800 and TFTS yielded the result that guard bands will need
