Multiplex communications – Communication over free space – Repeater
Patent
1996-03-29
1998-01-20
Ton, Dang
Multiplex communications
Communication over free space
Repeater
30347, H04J 316
Patent
active
057107653
ABSTRACT:
A TDMA system with a TDMA frame format that requires no guard time, or with a maximum guard time of one clock cycle of the high timing base is applied to a network with a fixed central base, or headend, and remote units, called Premises Interface Devices (PIDs), which have a fixed communication media, such as a cable, between the headend and PID. This TDMA system is particularly useful for increasing system efficiency for CATV applications. The system method works as follows: a remote PID attempting to access the system sends a short data burst to the headend. By measuring the time difference between the time reference and the beginning of the uplink signal received, the headend will send timing correction/adjustment information to the PID. The PID then adjusts the timing of its data bursts, optionally sends a trial message and, once a verified correct transmission is acknowledged by the headend, sends regular data.
REFERENCES:
patent: 4606023 (1986-08-01), Dragoo
patent: 4653049 (1987-03-01), Shinmyo
patent: 5010567 (1991-04-01), Tsushima
patent: 5258980 (1993-11-01), Maebara et al.
patent: 5550992 (1996-08-01), Hashimoto
Lam Steve
Lee Xiaoyang
Matsushita Electric - Industrial Co., Ltd.
Ton Dang
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