WLAN Signal Transmission via Channel Aggregation and Conjugate Mapping
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face limitations in reliably transmitting and receiving signals through aggregated channels, particularly in OFDM mode, due to restricted channel bonding capabilities and inefficiencies in multiple input multiple output (MIMO) techniques.
Innovation Solution
A method and device for transmitting and receiving signals in OFDM mode by mapping modulation symbol values and their conjugates to two aggregated channels, using quadrature phase shift keying (QPSK) modulation and dual carrier modulation (DCM) staggered quadrature phase shift keying (SQPSK) across these channels, enabling efficient channel aggregation and improved signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel aggregation is implemented in OFDM mode, then bandwidth and throughput are increased, but signal transmission reliability deteriorates due to limited channel bonding capabilities
Solution Approach 1:
The patent combines two separate channels into an aggregated channel pair, mapping modulation symbols to both channels simultaneously. This merging approach increases the effective bandwidth and throughput while maintaining reliability through the use of conjugate values and staggered QPSK modulation that ensures robust signal transmission across the aggregated channels.
Solution Approach 2:
The patent introduces a new dimension of channel aggregation in OFDM mode by mapping signals across multiple channels with specific modulation schemes. This dimensional expansion allows the system to achieve higher throughput by utilizing multiple channels simultaneously while maintaining reliability through structured signal mapping and conjugate value transmission.
2Productivity
If MIMO techniques are applied to increase transmission rate, then productivity improves, but device complexity increases
Solution Approach 1:
The patent segments the transmission process by separating the mapping of modulation symbols and their conjugate values to different channels. This segmentation allows the system to achieve MIMO-like performance through channel aggregation without requiring complex multiple antenna implementations, thereby improving transmission rate while controlling device complexity.
3Area of stationary object
If conventional channel bonding is used, then bandwidth is limited, but implementing advanced aggregation techniques increases device complexity
Solution Approach 1:
The patent changes the modulation parameters by employing staggered QPSK modulation and conjugate value mapping across aggregated channels. This parameter change enables the system to achieve higher effective bandwidth through channel aggregation while managing device complexity through standardized modulation techniques that build upon existing OFDM capabilities.
Data Source
AI summary
A method of transmitting and receiving signals in a wireless local area network (WLAN) system and a device for the same are provided. More particularly, there are provided a method and a device for the same in which a station operating in an orthogonal frequency division multiplexing (OFDM) mode transmits and receives signals through two aggregated channels.