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700 MHz Interoperability Channel Spacing. NCC March 22-23, 2001 Washington, DC. 25 kHz = 4 x 6.25 kHz. Original FCC Band Plan. 12.5 kHz. RESERVE. I/O. RESERVE. RESERVE. What 4 th R&O gave us. 12.5 kHz. General Use. I/O. State Block. RESERVE. Concern about
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700 MHz Interoperability Channel Spacing NCC March 22-23, 2001 Washington, DC
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
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
Offending Transmitter Technology ACPR from Various Technology Transmitters into Project 25 Phase I (I/O) Receiver vs. Spacing between Channel Edges
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)
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)
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
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
Victim Receiver Technology ACPR from Project 25 Phase I (I/O) Transmitter into Various Technology Receivers vs. Spacing between Channel Edges
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
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
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
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
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
+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