PATENT CLAIM ANALYSIS

Application Number: 15916607
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2019-09
Patent Classification: ["398", "208000"]

Abstract:
Pilot-aided digital coherent reception of high-order QAM signal detection using a continuous short pilot preamble and subsequent pilot symbols that are periodically distributed with payload data resulting in low-complexity and fast-convergence signal detection for continuous mode coherent reception of high-order QAM signals. A digital signal processor is configured to demodulate a transmitted data stream from digital stream of measurements of light mixtures produced in a receiver for coherent optical communications in response to receiving modulated optical carriers. The digital signal processor includes one circuit stage for providing corrections to the digital stream to compensate first effects on the light mixtures due to a frequency shift of a local optical oscillator of the receiver and another circuit stage for correcting the digital stream to compensate for second effects on the light mixtures due to polarization dependent channel modification of the modulated optical carriers.

Claim (Index 10):
An apparatus, comprising:\n a transceiver for coherent optical communications, the transceiver including a transmitter and a receiver, wherein the transmitter is configured to transmit optical carriers modulated to carry data according to a phase modulation scheme, and wherein the receiver includes a digital signal processor and a local optical oscillator; and wherein the digital signal processor is configured to demodulate a transmitted data stream from a digital stream of measurements of light mixtures produced in the receiver in response to receiving modulated optical carriers; wherein the digital signal processor includes one circuit stage for providing corrections to the digital stream to compensate for first effects on the light mixtures due to a frequency shift of the local optical oscillator and another circuit stage for providing corrections to the digital stream to compensate for second effects on the light mixtures due to polarization dependent channel modification of the modulated optical carriers; and wherein the circuit stages are configured to estimate initial ones of the corrections to the digital stream to compensate for the first and second effects based on one or more segments of the digital stream corresponding to predefined optical pilot symbols received by the receiver; and wherein the circuit stages are configured to estimate further of the corrections to compensate the first effects to compensate based on disjoint segments of the digital stream corresponding to other optical pilot symbols of predefined phase received by the receiver; and wherein the receiver is configured to demodulate a data stream from portions of the received modulated optical carriers whose polarization components have been modulated according to optical QAM constellations with at least 16 symbol points.

Metadata:
- Claim Count in Document: 18.0
- Percentile: 90.0
- Lexical Diversity: 1.88312
- Patent Class: 398.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15612385', '12642762', '13270804', '15525670', '13041384']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6773298246642874
- 35 USC 102 Novelty (BERT): 0.5025485506664038
- Combined Prediction Score: 0.6598516972644991
- Mean Citation Score: 219.111004
- Max Citation Score: 231.6445
- Similarity Product: 183.1543240270317

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test