| 摘要 |
N-34-4279M/SK/86 SPREAD SPECTRUM POWER LINE COMMUNICATION This invention is directed to various improvements in spread spectrum power line communications. One aspect of the invention relates to collision avoidance between various "slave" unit transmitters trying to send messages to a single "master" unit receiver by detecting whether the transmission path is in use and refraining from transmitting if it is. Other aspects of the invention relate to controlling the frequencies of spread spectrum data messages transmitted, the use of Gold'scodes and switching frequency bands on the power line to avoid frequencies where there has been a deterioration of transmission. |
