Training-Enhanced OTN Frame Parallel Stream Equalization

The patent applies preliminary action by embedding a known training sequence at the beginning of each OTN frame before transmission. This training sequence is prepared in advance and allows the receiver to perform channel estimation and equalizer adaptation without requiring complex continuous monitoring mechanisms. The training sequence is inserted into the FEC parity section, and its position and structure are predetermined, enabling the receiver to quickly synchronize and adapt to channel conditions.

The patent applies parameter changes by modifying the FEC parity section parameters to include a training sequence instead of traditional overhead bytes. The training sequence uses specific bit patterns (e.g., alternating 0s and 1s) that optimize channel estimation performance. This parameter modification allows the system to maintain data transport flexibility while reducing overhead redundancy, as the training sequence is more efficient than traditional SONET/SDH overhead structures.

The patent applies mechanics substitution by replacing the mechanical buffer-based synchronization approach with a signal processing-based solution. Instead of using physical buffers to compensate for skew between parallel channels, the system uses a training sequence followed by adaptive equalization algorithms. The equalizer adjusts its parameters based on the known training sequence to compensate for channel skew and differential delay, eliminating the need for large buffers and reducing device complexity.

The patent applies dimensionality change by moving from simple intensity modulation (1 bit per symbol) to more complex modulation schemes that utilize multiple dimensions such as phase and polarization. The training sequence enables the receiver to accurately detect and decode these higher-dimensional signal variations, allowing speeds of 40/100 Gbps and above. The training sequence provides the reference needed to interpret the complex modulated signals correctly.

The patent applies the intermediary principle by introducing a known training sequence as a mediator between the transmitted signal and the receiver's channel estimation process. The training sequence serves as a reference that simplifies the detection of channel characteristics in polarization multiplexed QPSK systems. By comparing the received training sequence with the known transmitted pattern, the receiver can accurately estimate channel parameters despite the complexity of semi-parallel channel characteristics.