WLAN PPDU Frequency-Segment Interleaving for Wider-Band Throughput
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Solution Overview
Problem
Current WLAN systems face limitations in achieving higher throughput rates, particularly with the increasing demand for wider channel bandwidths to support next-generation wireless local area networks requiring data processing rates of 1 Gbps or higher, while maintaining compatibility with legacy systems.
Innovation Solution
The method involves generating and transmitting data units using a wider bandwidth by encoding, segmenting, interleaving, and mapping data blocks into signal constellations, followed by Inverse Discrete Fourier Transform (IDFT) to create transmission signals that can be transmitted across single or non-contiguous frequency bands, utilizing existing bandwidths for enhanced frequency diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wider channel bandwidth is used to support higher throughput rates, then data processing rate is improved, but compatibility with legacy WLAN systems deteriorates
Solution Approach 1:
The data unit is divided into multiple blocks that are processed separately through encoding, interleaving, and mapping operations. This segmentation allows the system to handle wider bandwidths by processing data in manageable chunks while maintaining compatibility with legacy systems through standardized processing steps.
Solution Approach 2:
The patent introduces frequency domain mapping as an additional dimension for data transmission. By mapping coded blocks to specific frequency subcarriers and using IDFT to transform to time domain, the system extends transmission capability to wider bandwidths while preserving compatibility with existing WLAN infrastructure.
2Reliability
If data is transmitted across non-contiguous frequency bands, then frequency diversity is improved, but signal processing complexity increases
Solution Approach 1:
The patent performs preliminary interleaving and mapping operations before transmission, organizing data blocks into specific frequency domain patterns. This preliminary arrangement enables efficient utilization of non-contiguous frequency bands and simplifies the overall signal processing by pre-structuring the data for optimal frequency diversity.
Solution Approach 2:
The IDFT operation serves as an intermediary that transforms frequency domain mapped sequences into time domain transmission signals. This intermediary transformation simplifies the handling of non-contiguous frequency bands by converting complex frequency domain operations into more manageable time domain signals.
Data Source
AI summary
A method is provided for transmitting data in a wireless local area network. A transmitter generates an encoded data unit by performing a channel coding to transmission data to be included in a data field of a physical layer protocol data unit (PPDU). The transmitter generates at least one spatial block by re-arranging the encoded data unit, and divides each spatial block of at least one spatial block into two frequency segments. A bandwidth of each frequency segment is half of a bandwidth of the each spatial block. The transmitter interleaves the two frequency segments to generate a first interleaved segment and a second interleaved segment, respectively, and generates first and second mapped sequences by respectively mapping the first and second interleaved segments into a signal constellation. The transmitter performs an Inverse Discrete Fourier Transform (IDFT) on the first and second mapped sequences to generate and transmit a transmission signal.