发明名称 |
Förbättringar av, eller med avseende på, VDSL |
摘要 |
Zipper is the time-synchronized frequency-division duplex implementation of discrete multi-tome (DMT) modulation. Two communicating Zipper modems transmit DMT symbols simultaneously with a common clock. When all transmitters are time synchronized, the near end cross-talk (NEXT) and near end echoes injected into the received signal are orthogonal to the desired signal. The present invention provides a telecommunications transmission system using zipper and having at least two VDSL systems. Each VDSL system comprises a pair of zipper modems communicating over a cable transmission path. The telecommunications transmission system handles zipper transmission transmitted over the common cable; at least partly mitigates NEXT; and permits transmissions in a first VDSL system which are asynchronous with transmissions in a second VDSL system. |
申请公布号 |
SE9801150(L) |
申请公布日期 |
1999.08.22 |
申请号 |
SE19980001150 |
申请日期 |
1998.04.01 |
申请人 |
TELIA AB |
发明人 |
ISAKSSON MIKAEL;BENGTSSON DANIEL;SJOEBERG FRANK;OEDLING PER;NILSSON RICKARD;BAHLENBERG GUNNAR;JOHANSSON MAGNUS;OLSSON LENNART;OEKVIST SVEN GOERAN |
分类号 |
H04L5/14;H04L27/26;(IPC1-7):H04L5/06 |
主分类号 |
H04L5/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|