Frame synchronization in guided scrambling line codes

Guided scrambling (GS) ensures the existence of good line code properties in encoded bit sequences through appropriate augmentation of the source bit stream prior to self-synchronizing scrambling. At the receiver, a framing algorithm is required in order to identify the location of the augmenting bits in the unscrambled bit sequence. This paper proposes and analyzes a self-framing algorithm for achieving frame synchronization in GS line codes. This technique is based on the observation of a large number of transitions at codeword boundaries in the encoded sequence, and does not require any additional overhead. Analysis and simulation results confirm the viability of this technique.