Heterogeneous Link Communication for Pilot-Free Channel Equalization
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Solution Overview
Problem
Existing communication systems face challenges in maximizing throughput and minimizing latency due to intersymbol interference (ISI) caused by channel variations, which are exacerbated by the need for pilot and training symbols that reduce system efficiency.
Innovation Solution
The use of an alternate link with different characteristics from the wireless link to optimize performance, minimizing or eliminating the need for pilot and training symbols, by leveraging the alternate link to enhance throughput and reduce latency through channel estimation and equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pilot and training symbols are used for channel estimation and equalization, then channel impairment mitigation is improved, but system throughput is reduced and latency is increased
Solution Approach 1:
The patent introduces a heterogeneous alternate link as an intermediary to perform channel estimation and equalization tasks. This alternate link acts as a mediator that handles the computationally intensive equalization process, allowing the primary wireless link to focus on data transmission without being burdened by pilot symbols and training sequences.
Solution Approach 2:
The patent extracts the channel estimation and equalization functions from the primary wireless communication link and relocates them to a separate heterogeneous alternate link. This separation removes the overhead of pilot and training symbols from the main data transmission path, thereby improving throughput and reducing latency.
2Measurement precision
If training preambles are transmitted before each payload, then channel estimate accuracy is improved, but end-to-end latency is increased
Solution Approach 1:
The patent performs channel estimation and equalization in advance using the heterogeneous alternate link before the actual data transmission on the primary wireless link. This preliminary action on the alternate link ensures that channel conditions are already characterized, eliminating the need for time-consuming training preambles before each payload transmission.
Solution Approach 2:
The patent enables continuous data transmission on the primary wireless link by maintaining continuous channel estimation and equalization capabilities on the heterogeneous alternate link. This continuity eliminates the periodic interruptions that would otherwise be required for re-estimation and re-equalization, thereby reducing latency.
3Reliability
If pilot symbols are used in OFDM subcarriers, then frequency-domain equalization is improved, but system throughput is reduced
Solution Approach 1:
The patent uses the heterogeneous alternate link as an intermediary to perform frequency-domain equalization calculations. Instead of embedding pilot symbols in OFDM subcarriers, the alternate link handles the frequency-selective fading compensation, allowing all subcarriers to be used for data transmission and maximizing spectral efficiency.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~3
AI summary
A method and system for maximizing throughput and minimizing latency in a communication system that supports heterogeneous links is presented. The communication system supports a wireless link and an alternate link, and the method and system leverage the alternate link to reduce the overhead transmitted over the wireless link, thereby increasing throughput and reducing end-to-end latency. The higher latency alternate link provides a delayed version of an information signal that corresponds to a portion of the information signal that is transmitted on the wireless link. The received samples from the wireless and alternate links may be used to equalize subsequent portions of the information signal received over the wireless link, and may also be used for synchronization, timing recovery and frequency-offset estimation.