Tone Allocation for VHT Wireless Frames
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Solution Overview
Problem
Current communication systems, particularly those adhering to IEEE 802.11 standards, face challenges in efficiently allocating and receiving tones for high-throughput signals across varying bandwidths, which affects capacity, reliability, and efficiency in wireless communication.
Innovation Solution
The implementation of a communication device that dynamically allocates and receives orthogonal frequency division multiplexing (OFDM) tones based on bandwidth, specifically for 20 MHz, 40 MHz, 80 MHz, and 160 MHz channels, by utilizing specific numbers of tones for different fields within a frame, including VHT-SIG-A1, VHT-SIG-A2, VHT-STF, VHT-LTFs, VHT-SIG-B, and DATA fields, and incorporating pilot tones for modulation and channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bandwidth is increased to support higher data rates, then the capacity and throughput are improved, but the complexity of tone allocation and receiver configuration increases
Solution Approach 1:
The patent segments the frequency spectrum into distinct tone allocations for different signal fields (VHT-SIG-A1, VHT-SIG-A2, VHT-STF, VHT-LTFs, VHT-SIG-B, and DATA) based on bandwidth. Each bandwidth category (20 MHz, 40 MHz, 80 MHz, 160 MHz) has predefined tone segmentations that simplify the allocation process while supporting high throughput.
Solution Approach 2:
The system dynamically adapts tone allocation based on the detected bandwidth. The receiver determines the bandwidth and configures the appropriate number of tones for each field accordingly. This dynamic adaptation allows the system to optimize performance for each bandwidth scenario without requiring complex manual configuration.
2Adaptability or versatility
If dynamic tone allocation is implemented to optimize performance across varying bandwidths, then capacity and efficiency are improved, but the receiver processing complexity increases
Solution Approach 1:
The patent defines preliminary tone allocation tables for different bandwidth categories before the actual data transmission begins. The receiver pre-configures the expected tone distributions for VHT-SIG-A1, VHT-SIG-A2, VHT-STF, VHT-LTFs, VHT-SIG-B, and DATA fields based on the announced bandwidth, eliminating the need for complex real-time processing during transmission.
Solution Approach 2:
The system uses feedback mechanisms where the transmitter announces the bandwidth and tone allocation scheme in the VHT-SIG-A fields. The receiver uses this feedback information to correctly configure its tone expectations and processing parameters, simplifying the receiver's task to primarily parsing the announced configuration rather than autonomously determining optimal settings.
3Productivity
If more tones are allocated for high-throughput fields to increase data rate, then productivity is improved, but the reliability of tone reception and decoding may be compromised
Solution Approach 1:
The patent applies different quality characteristics to different tone allocations within the same bandwidth. Critical control fields like VHT-SIG-A1 and VHT-SIG-A2 use robust modulation and dedicated tone allocations that ensure reliable decoding, while data fields utilize the full tone spectrum for maximum throughput. This local optimization ensures that reliability is maintained where it matters most.
Solution Approach 2:
The system incorporates robust tone allocation for signaling fields before the data transmission begins. By allocating dedicated tones and using conservative modulation schemes for VHT-SIG-A1, VHT-SIG-A2, and other control fields, the system ensures reliable reception and decoding even under challenging conditions, providing a foundation for subsequent high-rate data transmission.
Data Source
AI summary
A communication device for allocating tones is described that includes a processor and instructions in memory in electronic communication with the processor. The communication device determines whether a bandwidth for signal transmission is 20, 40, 80 or 160 megahertz (MHz). The communication device respectively allocates tones for 20, 40, 80 or 160 MHz as follows: for a very high throughput (VHT) signal A1 (VHT-SIG-A1): 52, 104, 208, 416; a VHT signal A2 (VHT-SIG-A2): 52, 104, 208, 416; a VHT short training field (VHT-STF): 12, 24, 48, 48; one or more VHT long training field(s) (VHT-LTF(s)): 56, 114, 242, 484; a VHT signal B (VHT-SIG-B): 56, 114, 242, 484; and a data field (DATA): 56, 114, 242, 484. The communication device also transmits the signal.