Sub-carrier Re-channelization for 802.11ad Channel Bonding
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Solution Overview
Problem
The IEEE 802.11ad standard's channel spacing is a non-integer multiple of the sub-carrier spacing, limiting the ability to process multiple channels with a single Fast Fourier Transform (FFT), which hampers channel bonding and increases peak to average power ratio (PAPR), affecting data throughput in wireless communication systems.
Innovation Solution
Re-defining sub-carriers to align with a frequency grid, allowing even spacing and processing with a single FFT, and performing a small frequency shift for the 802.11ay portion to optimize channel center frequencies and sub-carrier frequencies, enabling efficient channel bonding and reduced PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If channel spacing is set to non-integer multiple of sub-carrier spacing, then channel bonding capability is improved, but processing complexity increases and PAPR increases
Solution Approach 1:
The patent redefines the relationship between channel spacing and sub-carrier spacing by introducing a frequency shift mechanism. The channel spacing is maintained as a non-integer multiple of the original sub-carrier spacing, but a frequency shift is applied to align the sub-carriers with a new grid, enabling integer multiple relationships in the shifted domain while preserving the original channel bonding capability.
Solution Approach 2:
The patent introduces a frequency shift as an intermediary transformation between the original channel spacing and the processing grid. This frequency shift acts as a mediator that allows the system to maintain flexible channel bonding while working with standardized processing grids, effectively decoupling the channel spacing design from the FFT processing requirements.
2Adaptability or versatility
If channel spacing is set to non-integer multiple of sub-carrier spacing, then channel bonding capability is improved, but PAPR increases
Solution Approach 1:
The patent applies a frequency shift parameter change that transforms the sub-carrier frequencies to align with a new grid. This parameter transformation maintains the channel bonding capability while repositioning the sub-carriers to reduce peak power occurrences, thereby lowering PAPR without sacrificing adaptability.
3Productivity
If sub-carriers are re-aligned with frequency grid, then processing efficiency is improved, but frequency accuracy requirements increase
Solution Approach 1:
The frequency shift serves as an intermediary that bridges the gap between the original channel spacing and the processing grid requirements. By introducing this intermediate transformation, the system achieves efficient grid-aligned processing while the frequency shift compensation mechanism maintains the required frequency accuracy for the redefined sub-carrier grid.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communications. The method comprises generating a frame comprising a first portion and a second portion. The method also comprises outputting the first portion of the frame for transmission on at least one channel, shifting a center frequency of the at least one channel, and outputting the second portion of the frame for transmission on the at least one channel after the center frequency shift.