Collision detection system for multiple stations in discrete mul

Details Collision detection system for multiple stations in discrete mul Collision detection system for multiple stations in discrete mul

1999-04-07

2000-06-13

Cangialosi, Salvatore

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

370447, H04J 324

Patent

active

060757957

ABSTRACT:
A novel collision detecting method is provided at the physical layer for use in a multi-point DMT communication network having stations transmitting over common media. The method includes generating a collision code corresponding to ID information of a station. A collision symbol representing the collision code is transmitted at the beginning of a portion of a random access data communication. A station in the network receives the collision symbol and decodes a collision signal carried by the collision symbol. A collision event is detected if the collision signal does not satisfy pre-set requirements. For example, energy of each component of the collision signal may be compared with a predetermined minimum energy level to generate a code element for each component having energy exceeding the predetermined minimum energy level. Validity of the code having the generated code elements is determined based on a predetermined validity criterion. Also, the distance in frequency domain between components of the collision signal corresponding to the generated code elements is compared with a predetermined minimum distance in frequency domain, to confirm validity of the detected code.

REFERENCES:
patent: 4885743 (1989-12-01), Helbers et al.
patent: 5012467 (1991-04-01), Crane
patent: 5657326 (1997-08-01), Burns et al.

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