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700 MHz Interoperability Channel Spacing PowerPoint Presentation
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700 MHz Interoperability Channel Spacing

700 MHz Interoperability Channel Spacing

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700 MHz Interoperability Channel Spacing

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  1. 700 MHz Interoperability Channel Spacing NCC March 22-23, 2001 Washington, DC

  2. 25 kHz = 4 x 6.25 kHz Original FCC Band Plan 12.5 kHz RESERVE I/O RESERVE RESERVE What 4th R&O gave us 12.5 kHz General Use I/O State Block RESERVE Concern about Interference to I/O channels Shift I/O to center of 25 kHz block G U ARD G U ARD What NCC wants, based upon 4th R&O 12.5 kHz General Use I/O State Block 40 dBc 60 dBc 60 dBc 65 dBc FCC ACCP specifications 700 MHz I/O Channel Shift w/ 4th R&O Changes ACCP into 6.25 kHz blocks 40 dBc 65 dBc 60 dBc 60 dBc FCC ACCP specifications

  3. C4FM into adjacent 6.25 kHz Bandwidth

  4. TETRA into adjacent 6.25 kHz Bandwidth

  5. C-QPSK into adjacent 6.25 kHz Bandwidth

  6. 700 MHz I/O Channel Shift 0 kHz, Separation Between blocks 12.5 kHz General Use I/O State Block RESERVE Shift I/O to center of 25 kHz block 6.25 kHz, Separation between blocks G U ARD G U ARD 12.5 kHz General Use I/O State Block

  7. Offending Transmitter Technology ACPR from Various Technology Transmitters into Project 25 Phase I (I/O) Receiver vs. Spacing between Channel Edges

  8. 700 MHz I/O Channel w/o Shift 12.5 kHz I/O RESERVE Linear 4-slot TDMA (18.75 kHz center to center spacing) 64 dB 12.5 kHz I/O RESERVE Linear CQPSK (9.375 kHz center to center spacing) 66 dB 12.5 kHz I/O RESERVE C4FM (12.5 kHz center to center spacing) 69 dB ACPR from Various Technology Transmitters into Project 25 Phase I (I/O) Receiver (all exceed FCC ACCP specification of 40 dBc)

  9. 700 MHz I/O Channel w/o Shift RCVR ENBW 12.5 kHz MODULATION I/O RESERVE Linear 4-slot TDMA (18.75 kHz center to center spacing) 64 dB 12.5 kHz I/O RESERVE Linear CQPSK (9.375 kHz center to center spacing) 66 dB 12.5 kHz I/O RESERVE C4FM (12.5 kHz center to center spacing) 69 dB ACPR from Various Technology Transmitters into Project 25 Phase I (I/O) Receiver (all exceed FCC ACCP specification of 40 dBc)

  10. 700 MHz I/O Channel w/ 6.25 kHz Shift G U ARD G U ARD 12.5 kHz I/O Linear 4-slot TDMA 65 dB G U ARD G U ARD 12.5 kHz I/O Linear CQPSK 68 dB G U ARD G U ARD 12.5 kHz I/O C4FM 87 dB ACPR from Various Technology Transmitters into Project 25 Phase I (I/O) Receiver

  11. 700 MHz I/O Channel w/ 6.25 kHz Shift RCVR ENBW G U ARD G U ARD 12.5 kHz MODULATION I/O Linear 4-slot TDMA 65 dB G U ARD G U ARD 12.5 kHz I/O Linear CQPSK 68 dB G U ARD G U ARD 12.5 kHz I/O C4FM 87 dB ACPR from Various Technology Transmitters into Project 25 Phase I (I/O) Receiver

  12. Victim Receiver Technology ACPR from Project 25 Phase I (I/O) Transmitter into Various Technology Receivers vs. Spacing between Channel Edges

  13. 700 MHz I/O Channel w/o Shift 12.5 kHz I/O RESERVE Linear 4-slot TDMA (18 kHz Rcvr BW, 18.75 kHz center to center spacing) 71 dB 12.5 kHz I/O RESERVE Linear CQPSK (5.4 kHz Rcvr BW, 9.375 kHz center to center spacing) 45.7 dB WORST CASE 12.5 kHz I/O RESERVE C4FM (5.4 kHz Rcvr BW, 12.5 kHz center to center spacing) 71.6 dB ACPR from Project 25 Phase I (I/O) Transmitter into Various Technology Receivers

  14. 700 MHz I/O Channel w/o Shift RCVR ENBW 12.5 kHz I/O RESERVE Linear 4-slot TDMA (18 kHz Rcvr BW, 18.75 kHz center to center spacing) MODULATION 71 dB 12.5 kHz I/O RESERVE Linear CQPSK (5.4 kHz Rcvr BW, 9.375 kHz center to center spacing) 45.7 dB WORST CASE 12.5 kHz I/O RESERVE C4FM (5.4 kHz Rcvr BW, 12.5 kHz center to center spacing) 71.6 dB ACPR from Project 25 Phase I (I/O) Transmitter into Various Technology Receivers

  15. 700 MHz I/O Channel w/ 6.25 kHz Shift G U ARD G U ARD 12.5 kHz 12.5 kHz I/O I/O RESERVE Linear 4-slot TDMA (18 kHz Rcvr BW, 25 kHz center to center spacing) MODULATION 83.3 dB G U ARD G U ARD 12.5 kHz 12.5 kHz I/O I/O RESERVE Linear CQPSK (5.4 kHz Rcvr BW, 15.625 kHz center to center spacing) 83.7 dB G U ARD G U ARD 12.5 kHz 12.5 kHz I/O I/O RESERVE C4FM (5.4 kHz Rcvr BW, 18.75 kHz center to center spacing) 88.3 dB ACPR from Project 25 Phase I (I/O) Transmitter into Various Technology Receivers

  16. 700 MHz I/O Channel w/ 6.25 kHz Shift RCVR ENBW G U ARD G U ARD 12.5 kHz 12.5 kHz I/O I/O RESERVE Linear 4-slot TDMA (18 kHz Rcvr BW, 25 kHz center to center spacing) MODULATION 83.3 dB G U ARD G U ARD 12.5 kHz 12.5 kHz I/O I/O RESERVE Linear CQPSK (5.4 kHz Rcvr BW, 15.625 kHz center to center spacing) 83.7 dB G U ARD G U ARD 12.5 kHz 12.5 kHz I/O I/O RESERVE C4FM (5.4 kHz Rcvr BW, 18.75 kHz center to center spacing) 88.3 dB ACPR from Project 25 Phase I (I/O) Transmitter into Various Technology Receivers

  17. T R Relative Effect of power coupled into Adjacent Channel I/O Channel User Adjacent Channel User ‘bigger’ 40 dB ACPR ‘hole’ around I/O user ‘smaller’ 80 dB ACPR ‘hole’ around I/O user

  18. +34.8 dBm (3 watts) • - ACPR • -3 dB portable A antenna • Free Space Loss • 7 dB Clutter • 3 dB portable B antenna • ------------- • Interferer A Signal Level into Receiver B