125 KHz transmitter and receiver - 5 meters range

We need an "experienced RFID designer" for doing below part of a project: Just guide us how to write related firmware, how to draw PCB antenna, which components to use.. etc. 1) LF BEACON (transmitter) - Only works as 125 KHz LF transmitter - Transmits a 8 byte data, every 100ms - Outer PCB size can go up to 150x120 mm - Range should be configurable between 50 cm to 5 meters (with 50 cm steps). It has to be selected by firmware. Users need to limit the range for some usecases - Antenna could be drawn on PCB (or a fixed antenna if you offer some types - but not coils) - We want to use MCU - not FBGA 2) LF TAG (receiver) - There should be a low power LF receiver (wakes up on LF signal availability). - The sample includes MCP2030 as receiver. We can use the same (or a new technology if you have better ideas) - We have size problem so LF receiver antenna should be very low size (maybe an SMD antenna?)