ELR Preamble Marker Sequences for Early BSS Color Detection
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Solution Overview
Problem
Challenges exist in efficiently operating receiving devices to manage link budget imbalance between uplink and downlink in wireless communications, leading to difficulties in detecting and decoding incoming data with low peak to average power ratio, especially in noisy environments, which results in energy wastage and communication issues.
Innovation Solution
Introduce enhanced long-range (ELR) mark symbols generated using orthogonal matrices, where the sequences are mirror images of each other, improving peak to average power ratio (PAPR) to enhance detectability and allow early packet termination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional preamble sequences are used for wireless transmission, then the transmission can be maintained with standard power levels, but the receiving device cannot reliably detect and decode incoming data when the signal is in the noise range with low peak to average power ratio
Solution Approach 1:
The patent modifies the preamble sequence parameters by using orthogonal matrices with specific column selections to create ELR mark symbols. These symbols are designed with optimized peak to average power ratio characteristics that enable reliable detection at lower signal levels, allowing the receiver to detect BSS color early and terminate packet processing to conserve energy
Solution Approach 2:
The patent embeds BSS color information in the ELR mark symbols within the preamble, allowing the receiving device to detect and identify the BSS color before processing the full data packet. This preliminary detection enables early packet termination when the BSS color does not match, conserving significant energy by avoiding processing of irrelevant packets
2Reliability
If the receiving device processes all incoming packets fully, then no data is lost, but energy is wasted when packets from other BSS are processed unnecessarily
Solution Approach 1:
The patent enables preliminary BSS color detection through ELR mark symbols in the preamble. The receiving device extracts and compares the BSS color from the detected symbols against its own BSS color before processing the full packet. This preliminary check allows early termination of packet processing for packets from other BSS, preventing energy wastage while maintaining reliability for valid packets
3Adaptability or versatility
If orthogonal matrices with many rows are used to represent all BSS colors, then all BSS can be distinguished, but the complexity of the orthogonal matrix increases
Solution Approach 1:
The patent segments the orthogonal matrix structure by selecting specific columns from a larger orthogonal matrix to form the ELR mark symbols. Instead of using the complete orthogonal matrix, the invention extracts and uses only the necessary column subsets, reducing the effective complexity while maintaining the ability to represent multiple BSS colors through the selected column patterns
Solution Approach 2:
The patent transitions from using row-based representation to column-based selection in the orthogonal matrix. By selecting specific columns from the orthogonal matrix to form the mark symbols, the invention changes the dimension of operation from rows to columns, enabling efficient BSS color encoding with reduced matrix complexity
Data Source
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AI summary
Aspects of the present solution provide improved sequences for extended long-range (ELR) communications. A sender (302) can generate a preamble for a physical layer protocol data unit (PPDU) frame of the ELR format to be transmitted to a receiver (304). The sender (302) can select, from a plurality of rows of an orthogonal matrix, a row corresponding to a basic service set (BSS) color of a plurality of BSS colors, and encode into a first symbol of the preamble, a sequence of values from a first set of columns of the row. The sender (302) can insert into a second symbol of the preamble, a second sequence of values from a second set of columns of the row, and transmit, to the receiver (304), the preamble with the first symbol and the second symbol to cause the receiver (304) to identify the BSS color of the sender (302) from the plurality of BSS colors.