Loading...
Please wait, while we are loading the content...
Similar Documents
Estudo de um transceptor com cancelamento de eco e projeto da arquitetura de um cancelador integrado
| Content Provider | Semantic Scholar |
|---|---|
| Author | Aita, André Luiz |
| Copyright Year | 1995 |
| Abstract | This work has two main goals. The first one is the study of a transceiver equipment to allow two-wire duplex data digital transmission over the existing telephonic network. An initial study of the subscriber line and of the main duplex transmission methods is done. The echo cancellation method is suggested since higher performance transceiver may be obtained. The structure of the transceiver is considered and defined. Besides the echo canceller, all the others circuits deemed important by the author are analysed. The second goal comprehends the study of an architecture capable of implementing the transceiver echo canceller, and its specification and simulation. Initially, gearing to the equipment proposal, the type of cancellers, ways of cancelling and other related characteristics are approached. The algorithm used for the adaptation of coefficients is exposed and validated through simulations. The problems due to the use of finite word length in digital systems are considered. The cancelling operation procedures are specified and the different tasks are distributed. Finally, at the end of this work, the data path, composed of two processors, of a register bank and of an I/O interface, is proposed. The architecture is described in the HDC hardware description language, and later it is simulated for validation of the proposed functions. The control path, partially described in HDC also, has some of its characteristics addressed. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.lume.ufrgs.br/bitstream/handle/10183/25623/000102571.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
