Dynamic transmission power control method

1. A dynamic transmission power control method for a transmitter of a communication system which comprises the transmitter and a plurality of receivers, the transmitter coupled to the plurality of receivers via a plurality of corresponding outgoing links, the transmission power control method comprising:

collecting a plurality of suggested transmission power back-off levels for the plurality of outgoing links to the plurality of receivers and/or a plurality of channel characteristics corresponding to the plurality of outgoing links from the plurality of receivers; and

determining an allowable transmission power back-off level for a desirable receiver among the plurality of receivers according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics.

2. The transmission power control method of claim 1 further comprising:

transmitting a packet to the desirable receiver with the allowable transmission power back-off level;

wherein the plurality of receivers correctly detect a header of the packet, and the desirable receiver correctly detects the header and the payload of the packet.

3. The transmission power control method of claim 2 , wherein the header comprises a preamble symbol and a frame control (FC) symbol.

4. The transmission power control method of claim 2 , wherein the step of determining the allowable transmission power back-off level for the desirable receiver among the receivers according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics comprises:

calculating a plurality of maximum detectable power back-off levels for the plurality of receivers excluding the desirable receiver to correctly detect the header of the packet according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics of the plurality of receivers excluding the desirable receiver.

5. The transmission power control method of claim 4 , wherein the step of determining the allowable transmission power back-off level for the desirable receiver among the receivers according to the plurality of suggested transmission power back-off levels and the plurality of channel characteristics further comprises:

determining the allowable transmission power back-off level equal to or lower than a lower transmission power back-off level of a suggested transmission power back-off level of the desirable receiver and a minimum detectable power back-off level among the plurality of maximum detectable power back-off levels.

6. The transmission power control method of claim 2 , wherein the allowable transmission power back-off level comprises an allowable header transmission power back-off level and an allowable payload transmission power back-off level.

7. The transmission power control method of claim 6 further comprising:

transmitting the header of the packet with the allowable header transmission power back-off level and the payload of the packet with the allowable payload transmission power back-off level.

8. The transmission power control method of claim 6 , wherein the allowable header transmission power back-off level is equal to or lower than a minimum detectable power back-off level among a plurality of maximum detectable power back-off levels for the plurality of receivers to correctly detect the header of the packet, and the allowable payload transmission power back-off level is equal to or lower than a suggested transmission power back-off level of the desirable receiver.

9. The transmission power control method of claim 1 , wherein the communication system is a powerline communication (PLC) system.