PRBS Channel Estimation Error Correction
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Solution Overview
Problem
Channels introduce gain and memory errors that degrade the signal-to-noise ratio during data transmission, making it difficult to accurately recover the source input data at the output.
Innovation Solution
A system using pseudorandom binary sequences (PRBS) generates uncorrelated first and second PRBS values, which are exclusive-OR'd to produce a third PRBS. This third PRBS is added to input data for transmission, and the original PRBS values are used to correlate and correct for channel gain and memory errors, as well as any unwanted PRBS coupling, to estimate and remove errors from the output data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRBS is used for channel estimation, then channel gain and memory errors can be corrected, but PRBS values may couple through unwanted paths into the channel causing additional errors
Solution Approach 1:
The patent uses an intermediary approach by generating multiple uncorrelated PRBS sequences (first, second, and third PRBS) where the third PRBS is derived from the first two through XOR operation. This intermediary structure allows the system to distinguish between desired signal paths and unwanted coupling paths, as the uncorrelated nature of the first two sequences ensures that their combination can identify and eliminate unwanted PRBS coupling while maintaining accurate channel estimation.
2Reliability
If multiple uncorrelated PRBS sequences are generated and combined, then unwanted PRBS coupling can be eliminated, but device complexity increases
Solution Approach 1:
The patent segments the PRBS generation process into distinct components: a first PRBS generator producing a first sequence, a second PRBS generator producing a second sequence, and a combiner that XORs these sequences to produce a third PRBS. This segmentation allows each component to be independently optimized and managed, reducing overall system complexity while maintaining the reliability benefits of using multiple uncorrelated sequences for eliminating unwanted coupling.
Data Source
AI summary
A system includes a pseudorandom binary sequence (PRBS) generator configured to generate a first PRBS and a second PRBS and an exclusive-OR logic configured to exclusive-OR the first PRBS and the second PRBS to compute a third PRBS. The system also includes an adder, a correlator and a corrector. The adder adds the third PRBS to input data to compute summed data for transmission of the summed data across the channel. The correlator computes the exclusive-OR of the first PRBS and the second PRBS to reproduce the third PRBS and correlates output data from the channel to the reproduced third PRBS to compute a channel gain error and a channel memory error. The corrector extracts the input data from the output data from the channel using the computed channel gain and memory errors.