MU-PPDU Pre-FEC Padding for Balanced OFDM Symbol Duration
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Solution Overview
Problem
Existing wireless local area networks (WLANs) face challenges in efficiently utilizing resources due to noise and the need to support both newer and legacy protocols, leading to suboptimal bandwidth and response times, especially in environments with multiple devices operating on different bands and channels.
Innovation Solution
Implementing a radio architecture that includes separate or shared front-end module (FEM) and radio IC circuitry for WLAN and Bluetooth, along with baseband processing, to support coexistence and efficient operation across various IEEE 802.11 standards, including IEEE 802.11ax, with features like OFDM and OFDMA, and utilizing direct conversion mixers for reduced noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices operate on the same wireless resources, then device connectivity is improved, but bandwidth and response times deteriorate due to resource sharing and noise
Solution Approach 1:
The patent segments the wireless communication system into different spatial streams and uses spatial division multiplexing to separate data transmissions. By dividing the available spatial resources into multiple independent streams, the system can serve multiple devices simultaneously without significant interference, thereby improving both connectivity and bandwidth efficiency.
Solution Approach 2:
The patent introduces spatial dimension as an additional resource for multiplexing. By utilizing multiple spatial streams and beamforming techniques, the system transitions from traditional frequency-division approaches to spatial-division approaches, enabling simultaneous communications across different spatial directions and improving overall system capacity.
2Adaptability or versatility
If multiple devices operate on the same wireless resources, then device connectivity is improved, but response times deteriorate due to shared access and noise
Solution Approach 1:
The patent segments transmission time into different spatial streams that can operate simultaneously. By using spatial division multiplexing, the system eliminates the need for sequential time-division access, thereby reducing response times while maintaining connectivity for multiple devices.
Solution Approach 2:
The patent enables continuous data transmission across multiple spatial streams simultaneously rather than sequentially. This continuous parallel transmission approach eliminates idle waiting time between transmissions and maintains continuous useful action across all active device connections, significantly improving response times.
3Adaptability or versatility
If wireless devices operate with both newer and legacy protocols, then protocol compatibility is improved, but resource efficiency deteriorates due to needing to support multiple standards
Solution Approach 1:
The patent implements a universal baseband processing architecture that can handle multiple protocol types (802.11ax, 802.11ac, 802.11n, and legacy protocols) through a single integrated platform. The system uses configurable parameter sets and flexible spatial stream handling to support different protocol requirements without requiring separate dedicated processing paths for each standard, thereby improving resource efficiency.
Solution Approach 2:
The patent employs parameter-based configuration to adapt the same hardware and processing architecture to different protocol requirements. By changing parameters such as modulation schemes, coding rates, and spatial stream configurations, the system can efficiently support multiple protocol generations using the same physical resources, eliminating the need for separate hardware paths for each protocol.
4Device complexity
If traditional signal processing is used, then implementation simplicity is maintained, but noise and interference increase reducing resource utilization
Solution Approach 1:
The patent segments the signal processing into separate spatial streams with independent processing paths. By dividing the signal into multiple spatial components that can be processed independently, the system reduces interference between different data streams and improves the signal-to-noise ratio for each stream, thereby reducing overall noise and interference in the system.
Data Source
AI summary
Methods, apparatuses, and computer readable media for pre-FEC padding, where an apparatus of an AP is configured to: determine, for encoding a MU-PPDU, a number of data bits left in last OFDM symbols for a plurality of users, the number of data bits left in the last OFDM symbols determined based on numbers of bytes to encode for the plurality of users modulus corresponding summations of data bits per symbol per user and per spatial stream, determine initial numbers of symbol segments in the last OFDM symbols based on the number of data bits in the last OFDM symbols, determine, based on the numbers of bytes to encode for the plurality of users, initial numbers of symbols for the plurality of users, and determine, based on the initial numbers of symbol segments and the initial numbers of symbols, users of the plurality of users having a longest encoded packet duration.