WLAN Long-Range Communication Through Adaptive Low-Rate Coding
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Solution Overview
Problem
Existing wireless communication technologies face challenges in achieving extended long range and reliability in WLANs, particularly due to imbalances in link budget between downlink and uplink communications, which affect data transmission efficiency and range.
Innovation Solution
Implementing systems and methods that utilize LDPC and BCC codes with specific modulation schemes and configurations, such as QPSK and BPSK, along with optimized RU and LTF/CP settings, to support low PHY data rates like 1Mbps, thereby enhancing communication range and balancing uplink and downlink throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing wireless communication technologies are used, then standard WLAN communication is achieved, but extended long range and reliability are not achieved due to link budget imbalances
Solution Approach 1:
The patent applies parameter changes by modifying the code rate from standard values to non-standard values (1/4, 1/5, 1/6, 1/8, 1/10, 1/16, 1/32). These parameter adjustments enable extended long range communication by optimizing the trade-off between data rate and transmission reliability, directly addressing the link budget imbalance problem in WLAN uplink communications.
Solution Approach 2:
The patent implements dynamics by enabling the wireless communication system to dynamically select from multiple non-standard code rates based on channel conditions and communication requirements. This dynamic adaptation allows the system to optimize performance for extended long range scenarios while maintaining compatibility with standard WLAN infrastructure.
2Length of stationary object
If low PHY data rates like 1Mbps are supported, then extended communication range is achieved, but data transmission efficiency decreases
Solution Approach 1:
The patent resolves this contradiction by introducing non-standard code rates (1/4, 1/5, 1/6, 1/8, 1/10, 1/16, 1/32) that enable the system to achieve extended communication range while maintaining acceptable data transmission efficiency. These parameter changes allow flexible trade-offs between range and throughput based on specific communication scenarios.
Solution Approach 2:
The patent applies partial action by selectively using non-standard code rates only when extended range is required, rather than forcing low data rates in all scenarios. This allows the system to maintain high efficiency for standard range communications while enabling extended range when needed.
3Productivity
If standard code rates are used, then data transmission efficiency is maintained, but extended long range communication is not achieved
Solution Approach 1:
The patent directly addresses this contradiction by modifying the code rate parameter from standard IEEE 802.11 values to non-standard values (1/4, 1/5, 1/6, 1/8, 1/10, 1/16, 1/32). This parameter change enables the system to achieve both extended range and improved reliability for uplink communications while maintaining efficient data transmission.
Solution Approach 2:
The patent implements dynamic code rate selection, allowing the system to adapt between standard and non-standard code rates based on communication requirements. This dynamic approach ensures optimal data transmission efficiency for near devices while enabling extended range communication for distant devices.
Data Source
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AI summary
In some implementations, an apparatus (105) may include a transmitter (120) and one or more processors (2010). The one or more processors (2010) may identify a target data rate for transmitting data over a channel with a frequency bandwidth. Based at least on the target data rate, the one or more processors (2010) may select a forward error correction, FEC, code, a code rate, a modulation scheme, and a number of resource units,,Rus, within the frequency bandwidth, to transmit the data within a range of the target data rate. The one or more processors (2010) may encode, by an FEC encoder (1340), the data using the FEC code and the code rate to generate encoded data. The one or more processors (2010) may modulate the encoded data using the modulation scheme to generate modulated data. The transmitter (120) may transmit the modulated data using the number of RUs.