Concurrent Wireless Signal Transmission via OFDM Subcarriers
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Solution Overview
Problem
Current wireless communication systems are limited by the constraint that only one device can transmit at a time to avoid interference, leading to reduced overall throughput in dense deployments where many devices operate in close proximity.
Innovation Solution
Implementing novel architectures and methods that allow concurrent transmissions by processing and analyzing signals to determine concurrent transmission parameters, enabling devices to transmit simultaneously without strong interference, using techniques such as orthogonal frequency division multiplexing (OFDM) and orthogonal frequency division multiple access (OFDMA) signaling, and adjusting carrier sense thresholds dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one device transmits at a time to avoid interference, then transmission reliability is improved, but system throughput deteriorates
Solution Approach 1:
The patent segments the transmission medium into multiple orthogonal channels (subcarriers in OFDM, codes in OFDMA) that can be independently accessed. This allows multiple devices to transmit simultaneously on different segments without interference, resolving the contradiction between reliability and throughput by enabling parallel transmissions across segmented channels
Solution Approach 2:
The patent introduces additional dimensions for transmission differentiation: frequency domain (OFDM subcarriers, OFDMA resource blocks), code domain (spreading codes, modulating codes), and spatial domain (MIMO streams). By moving from single-time-access to multi-dimensional access, multiple devices can transmit concurrently without mutual interference while maintaining reliability
2Object-affected harmful factors
If devices wait for channel to be clear before transmitting, then interference is avoided, but transmission time is lost
Solution Approach 1:
The patent implements preliminary channel reservation through virtual time slots, priority-based access rights, and pre-allocated resource blocks. Devices with higher priority or pre-assigned resources can transmit immediately without waiting for the channel to be completely clear, reducing idle time while maintaining interference avoidance through structured access control
Solution Approach 2:
The patent dynamically adjusts transmission parameters including carrier sense thresholds, backoff times, and resource allocation based on real-time channel conditions and device priorities. This dynamic adaptation allows the system to optimize between interference avoidance and transmission time utilization under varying load conditions
3Device complexity
If traditional carrier sense is used, then simple implementation is maintained, but spatial reuse is limited
Solution Approach 1:
The patent modifies carrier sense parameters dynamically, including adjusting carrier sense thresholds based on transmission power, distance, and interference conditions. It introduces virtual carrier sense mechanisms that consider priority information and reserved time slots. These parameter changes enable the system to achieve high spatial reuse while maintaining manageable implementation complexity through standardized protocol extensions
Data Source
AI summary
A wireless communication device includes communication interface configured to receive and transmit signals and a processor configured to generate and process such signals. The communication interface of the wireless communication device is configured to receive a first signal from a first other wireless communication device, and the processor of the wireless communication device is configured to process the first signal to determine one or more concurrent transmission parameters. The processor of the wireless communication device is configured to generate the second signal based on the one or more concurrent transmission parameters and direct the communication interface to transmit the second signal to a second other wireless communication device during receipt of the first signal from the first other wireless communication device. The wireless communication device may be configured to make such concurrent transmissions based on one or more considerations such as the power level of the first signal.