Time-division multiplexing transmission system
AssigneeNEC Corporation
InventorHajime Ishikawa
Life of this patent
Estimating the term…
Abstract
In a transmitter, at least some of synchronization patterns in a signal having frame structure are inverted in a bit inverting circuit, and a plurality of channels of signals which include a signal having the inverted synchronization patterns are multiplexed and transmitted in a time-division manner. In a receiver, the time-division multiplexed channels are demultiplexed into individual channels. Then, frame synchronization is performed on the basis of the channel having the inverted synchronization patterns among the demultiplexed channels. With the frame synchronized channel as a reference, the remaining channels are identified. There is no need to provide a synchronization circuit in each channel, and the size of the system is not increased.
Claims16
A time-division multiplexing transmission system for multiplexing and transmitting a plurality of channels of signals which include at least one frame structure signal having frame structure in a time-division manner, the time-division multiplexing transmission system comprising:
- a transmitter having inversion means for inverting at least some of synchronization patterns in said frame structure signal, and time-division multiplexing means for multiplexing and transmitting a plurality of channels of signals which include a signal having the inverted synchronization patterns in a time-division manner;
- and
- a receiver having demultiplexing means for demultiplexing the time-division multiplexed channels into individual channels, frame synchronization means for performing frame synchronization on the basis of the channel having the inverted synchronization patterns among the demultiplexed channels, and channel identification means for using the frame synchronized channel as a reference and recognizing the remaining channels.
A transmitter which is employed in a time-division multiplexing transmission system for multiplexing and tansmitting a plurality of channels of signals which include at least one frame structure signal having frame structure in a time-division manner, the transmitter comprising:
- inversion means for inverting at least some of synchronization patterns in said frame structure signal;
- and
- time-division multiplexing means for multiplexing and transmitting a plurality of channels of signals which include a signal having the inverted synchronization patterns in a time-division manner, said inverted synchronization patterns being used to identify a fame synchronization channel as a reference for channel identification means to recognize the remaining channels when said plurality of channels of signals are demultiplexed.
A receiver which is employed in a time-division multiplexing transmission system for multiplexing and transmitting a plurality of channels of signals which include at least one frame structure signal having frame structure in a time-division manner, the receiver comprising:
- demultiplexing means for demultiplexing the time-division multiplexed channels into individual channels;
- frame synchronization means for performing frame synchronization on the basis of the channel having an inverted synchronization patterns among the demultiplexed channels;
- and
- channel identification means for using the frame synchronized channel as a reference and recognizing the remaining channels.
Dependencies are inferred from the claim text.