Forward-link sync-channel interleaving/de-interleaving for communication systems based on closed-form expressions

摘要

Interleaving and de-interleaving of forward-link Sync channels is performed by implementing closed-form expressions that are equivalent to the table-based processing specified in the cdmaOne telecommunication specification. The implementation can be in either hardware or software or a combination of both. For Sync-channel interleaving, the closed-form expression relates each un-interleaved symbol position to a corresponding interleaved symbol position, which is used to generate an interleaved symbol stream from the un-interleaved symbol stream. For Sync-channel de-interleaving, the closed-form expression relates each interleaved symbol position to a corresponding de-interleaved symbol position, which is used to generate a de-interleaved symbol stream from the interleaved symbol stream. In one hardware implementation, the forward-link interleaver/de-interleaver of the present invention has an address generation unit made from a modulo counter and a bit reversal unit.