Meaning
Bluetooth LE transmission mode that utilizes forward error correction to improve receiver sensitivity at the expense of data rate. Selecting coded phy allows devices to maintain a connection over much larger distances than standard physical layers. Use of this mode is restricted to the physical layer and does not alter the higher level protocol logic.
Range Extension
Transmission distance increases by a factor of four when the system applies the maximum redundancy levels. Because coded phy adds extra bits to the data stream, the receiver can reconstruct the original message even when the signal is very weak.
Power Consumption
Radio hardware stays active for longer periods to transmit the additional error correction data. While coded phy improves the link budget, it increases the energy cost per byte of data sent.
Link Budget
System designers use this mode to overcome path loss in challenging environments such as industrial buildings or dense urban areas. The use of coded phy provides an additional 12 decibels of sensitivity, which translates to a more reliable connection in the presence of physical obstacles. This trade off between speed and distance is a fundamental characteristic of modern low power wireless communication.
Operating in this mode requires both ends of the wireless link to support the specific hardware requirements of the coded physical layer.
