In-Vehicle Distributed Antenna System for High-Speed Data

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Solution Overview

Problem

Conventional vehicular MIMO systems face challenges in providing high data rate and quality of service at high speeds due to the limitations of large antenna arrays, which affect vehicle design and aerodynamics, and require complex decoding processes that increase processing time and complexity.

Innovation Solution

The implementation of an in-vehicle distributed antenna system (DAS) with multiple small antenna units distributed within the vehicle, where each unit performs decoding and reports results to a central unit, allowing for parallel processing and reduced decoding time by sharing log-likelihood ratios and adjusting traffic based on reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If large size antenna arrays are implemented in conventional vehicular MIMO systems, then high data rate and quality of service can be provided, but vehicle design and aerodynamics are adversely affected

Engineering Contradiction:

Improvedata rateVSAvoidaerodynamics

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the antenna system into multiple small distributed antenna units (DUs) placed throughout the vehicle interior, replacing the conventional large antenna array. Each DU independently processes signals, enabling the system to achieve high data rates through spatial diversity while maintaining vehicle aerodynamics by using small, distributed components rather than large集中的 arrays.

Inventive Principle:

Principle #1Segmentation

2Productivity

If large size antenna arrays are implemented, then high data rate can be achieved, but hardware complexity increases

Engineering Contradiction:

Improvedata rateVSAvoidhardware complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system divides the antenna functionality into multiple small distributed units, each with simplified hardware. Instead of one complex large antenna array, multiple simple DUs are distributed throughout the vehicle, reducing individual hardware complexity while maintaining overall system capability through parallel operation and coordination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a central unit (CU) as an intermediary that coordinates the multiple distributed antenna units. The CU manages signal processing and data aggregation, allowing each DU to have simplified hardware while the system as a whole achieves high data rates through centralized coordination and parallel processing.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If multiple distributed antenna units are used, then diversity gain is achieved, but signaling overhead increases

Engineering Contradiction:

Improvediversity gainVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent merges the signal processing functions of multiple distributed antenna units at the central unit. By combining signals and coordinating processing at the CU, the system achieves diversity gain from multiple spatially distributed antennas while reducing signaling overhead through centralized management rather than requiring extensive peer-to-peer communication between DUs.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The central unit acts as an intermediary that consolidates control and processing functions. This mediation allows distributed antenna units to achieve diversity gain while minimizing signaling overhead, as the CU coordinates their operation and aggregates their outputs rather than requiring complex inter-communication between all DU pairs.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If conventional decoding processes are used in distributed antenna systems, then decoding can be performed, but decoding time and processing complexity increase

Engineering Contradiction:

Improvedecoding accuracyVSAvoiddecoding time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary signal processing and pre-computation at the distributed antenna units before signals are aggregated at the central unit. By performing initial decoding operations and preparing data in advance at each DU, the system reduces the processing burden at the CU and overall decoding time, while maintaining decoding accuracy through coordinated processing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system enables continuous parallel processing across multiple distributed antenna units throughout the decoding process. Rather than sequential processing, multiple DUs work simultaneously on different aspects of signal decoding, maintaining continuous useful action and significantly reducing total decoding time while preserving accuracy through coordinated results aggregation.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS9735845B2Parallel processing in a distributed antenna system

Publication Date: 2017.08.15 LG ELECTRONICS INC

AI summary

The present document is for a wireless communication with reduced internal signaling burden in the distributed antenna system (DAS). In the proposed method, a user equipment (UE) receives a decoding unit, from the network, by multiple distributed unit (DUs) distributed within the UE, and decodes the decoding unit, at each of the multiple DUs. Each of the multiple DUs reports first information on the decoding result to a central unit (CU) controlling the multiple DUs, and the CU determines decoded bit values of the decoding unit based on the first information acquired from each of the multiple DUs.