COEXISTENCE OF PRIME, S-FSK AND G3 DEVICE IN POWER LINE COMMUNICATION

摘要

PROBLEM TO BE SOLVED: To reduce interference of modems that operate on a shared communication channel and comply with different standards, in power line communication.SOLUTION: To avoid mutual interference, a base node 1005 operating under a first standard reserves time using a contention free period designation, and allows devices operating under a second standard to communicate during the reserved time by not assigning the contention free period to another device operating under the first standard. Alternatively, a device using the first standard may avoid interference from transmissions generated under the second standard by modifying data packets prior to transmission. A prefix corresponding to a preamble in the second standard is added to the beginning of the data packet created under the first standard. Devices operating under the second standard observe the prefix and recognize that the channel is active. The second-standard devices back off from transmission thereby minimizing interference.SELECTED DRAWING: Figure 10