Digital Hardware Block to Estimate Channel Energy and Measure Signal Quality
Original Publication Date: 2003-May-28
Included in the Prior Art Database: 2003-May-28
This digital circuit estimates the energy of a radio channel so that a decision can be made on whether to transmit immediately or wait for an open channel, depending if the channel is determined to be idle or busy. The circuit also estimates the quality of a received data signal, which assists with scanning for like networks and building routing tables. All of these functions operate using the same digital circuit and require little or no intervention from the microprocessor running the communication stack. The need for this circuit comes from the design of a very low cost ISM-band personal area network transceiver, which operates in shared spectrum such that the busy/idle state of the channel prior to transmission and the quality of the received data signal during reception must be monitored.