mobile integrated radio systems. [MIRS]

MIRS is a cellular like system developer by Motorola to operate at the special mobile radio (SMR) band shown in the following figure.    

Band	Mobile transmission	Base transmission
A cellular band A	829-835, 845-8465 MHz	869-880, 890-891 MHz
B cellular band B	869,880,890-891.5 MHz	880-890,891.5-895 MHz
ESMR	806-821 MHz	851-866 MHz

v     MIRS system is called by the manufactures. The system providers call this system ESMR. The SMR band is in the part of FCC CFR in the private sector.

v     Public information on this system is limited however the operational function is the same as the cellular system. Since many existing SMR system are still in operation the MIRS frequency channels in the SMR band are restricted depending on the area in which they operate. Therefore a special frequency assignment will be imposed in the MIRS system.

v     Top level system specifications are as follows.

v      Full duplex communication system frequency

-          806 to 824 MHz mobile transmitter

-          851 to 869 MHz base transmitter

v     Channel band width – 25 MHz

v     Multiple access – TDMA

v     Number of time slots 0 6

v     Rate of speech coders – 4.2 kbps / slot

v     Modulation – 16 QAM

v     Speech coders – VSELP

v     No equalizer is implemented

v     Hand off

v     Transmission rate – 6.5 kbps/ slot

v     Forward error correction – 3 kbps

v     Inter leavens.