1、STD-CEPT ERC REPORT 55-ENGL 1777 D 232b414 0043405 74T ERC REPORT 55 European Radiocommunications Committee (ERC) -.- within the European Conference of Postal and Telecommunications Administrations (CEPT) UNWANTED EMISSION INTERFERENCE FROM MOBILE EARTH STATIONS INTO FIXED SERVICE RECEIVERS IN THE 2
2、 GHz BAND Sesimbra, January 1997 Copyright 1998 the European Conference of Postal and Telecommunications Administrations (CEPT) STDOCEPT ERC REPORT 55-ENGL 1997 = 232b414 0013407 7L2 m UNWANTED EMISSION INTERFERENCE FROM MOBILE EARTH STATIONS INTO FIXED SERVICE RECEIVERS IN THE 2 GHz BAND ABSTRACT .
3、 1 1 INTRODUCTION . 1 2 METHODOLOGY . 1 3 INTERFERENCE CALCULATIONS 3 3.1 EXAMPLE FIXED SERVICE (FS) SYSTEM . 3 MOBILE EARTH STATION (MES) CHARACTERISTICS . 3 3.2. I TDUA case 3 3.2.2 CDM case . 3 3.2.3 MES density 3 3.2 4 RESULTS 4 5 CONCLUSIONS . 4 UNWANTED EMISSION INTERFERENCE FROM MOBILE EARTH
4、STATIONS INTO FIXED SERVICE RECEIVERS IN THE 2 GHz BAND ABSTRACT WG-SE has studied the ETS 300 734 unwanted emission limits for S-PCN Mobile Earth Stations (MES) from the point of view of protecting the Fixed Service (FS). A methodology was developed to assess the impact of MES unwanted emissions on
5、 FS receivers in terms of the probability of interference. These probabilities were compared to relevant ITU-R FS performance objectives. WG-SE concludes that ETS 300 734 would provide adequate protection of adjacent band Fixed Service receivers. 1 INTRODUCTION This document studies the potential fo
6、r interference from unwanted emissions of Mobile Earth Stations, operating in Satellite Personal Communication Networks (S-PCN) systems in the 1980 - 2010 MHz band, into Fixed Service receivers operating outside the same band, when the MES conform to the unwanted emission limits of ETS 300 734. 2 ME
7、THODOLOGY The following methodology for the calculation of the probability that a given criterion of C/(N+I) 2 X dB is breached, has been agreed by WG-SE. Compute the statistical distribution of the wanted signal C at the output of the FS receiver antenna, based on the fading distribution derived fi
8、om ITU-R Recommendation 530. 1: 2: For C = min to max (in steps of for example 0.5 dB) 3: Compute the maximum interference level (I) at the output of the FS receiver antenna to achieve C/(N+I)zX, using the following equation. 1 1OC/O 10N/10 I=lOlog - where N is the FS system noise power (W) at the o
9、utput of the FS receiver antenna. 4: For i = 1 to n (where i is the MES channel number) 5: For az = O“ to 360“ (where az is the azimuth direction fiom the FS receiver boresight to the interfering MES and the step size is for example i“) 6: Compute the required propagation loss L, using the following
10、 equation: L, = EIRP, - G, - I 1 The version approved for public vote at the Edinburgh SES meeting, Nov. 1996 STD.CEPT ERC REPORT 55-ENGL 1997 232b4L4 DOL3409 595 9 ERC REPORT 55 Page 2 where: 0 EIRPi is the unwanted EIRP, within the receiver bandwidth of the FS system, from an MES operating on chan
11、nel i; 0 G, is the FS receiver antenna gain in the direction of the interfering MES. 7: Compute the interference distance (d) assuming free space propagation for distances less than the maximum line- of-sight distance, and the spherical earth diffraction model in Recommendation ITU-R 526-2 for dista
12、nces greater than the maximum line-of-sight distance. The maximum line-of-sight distance can be calculated from the antenna heights of the FS and MES stations. 8: Next az 9: Compute the interference area, Ai(C) by adding area segments based on the interference distances obtained in step 7. 10: Next
13、i 11: NextC 12: Compute the probability that CM X and C/(N+I) 10-3 BER PL? (P,+P,) TDMA (Po+P,) Criteria 0.00005 10 0.0000600 0.00007 17 0.000 15 0.0001 14 0.000133 0.000160 CDMA for (Po+P,) 0.0 15 Figure 1: Example FS system C/N distribution (based on Recommendation 530) A = nominated bandwidth ch. 5 ch. 4 ch. 3 ch. 2 ch. 1 Figure 2: Illustration of the nominated bandwidth of MES carriers
