Antenna Weighting and Bitloading Vectors for mmWave Data Exchange
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Solution Overview
Problem
Broadband mmWave wireless communications systems face challenges in maintaining high channel rates due to directional signal radiation and high attenuation, leading to increased data errors from interference, which existing error mitigation methods address at the cost of reducing channel bandwidth.
Innovation Solution
The method involves determining and applying antenna weighting vectors (AWVs) and bitloading vectors (BLVs) through a beamforming training process, optimizing signal modulation and power distribution across sub-carriers to minimize data errors while maintaining channel bandwidth, using a communications system with embedded antenna arrays and OFDM modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is applied to address directionality and attenuation at mmWave band, then signal reach and integrity are improved, but device complexity increases due to embedded antenna arrays
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting antenna weighting vectors (AWVs) and bitloading vectors (BLVs) based on channel conditions. The receiver determines optimal AWVs and BLVs by analyzing received training sequences, then communicates these parameters back to the transmitter. This allows the system to adapt beamforming parameters in real-time to maintain signal integrity without requiring complex hardware modifications beyond the antenna array.
2Reliability
If error mitigation methods are used to reduce transmitted data errors, then data reliability is improved, but channel bandwidth capacity is reduced
Solution Approach 1:
The patent applies local quality by implementing bitloading, where different modulation schemes are applied to different sub-carriers based on their individual channel conditions. Sub-carriers experiencing interference use more robust modulation (lower order), while clean sub-carriers use higher-order modulation to maximize bandwidth. This localized adaptation allows the system to maintain high overall bandwidth while providing error mitigation precisely where needed, rather than uniformly reducing bandwidth across all sub-carriers.
3Productivity
If OFDM is used to divide broadband channel into sub-carriers, then bandwidth utilization is improved, but susceptibility to interference on specific sub-carriers increases
Solution Approach 1:
The patent applies dynamics by making the bitloading configuration adaptive rather than static. The receiver continuously monitors channel conditions on each sub-carrier and dynamically adjusts the BLV to match current interference patterns. When interference affects certain sub-carriers, the system dynamically reallocates bits to cleaner sub-carriers or applies more robust modulation only where necessary. This dynamic adaptation allows the OFDM system to maintain high bandwidth utilization while responding in real-time to interference conditions.
Data Source
AI summary
A communication system is provided. A first communications device transmits at least one first message including predetermined bit sequences. A second communications device determines one or more antenna weighting vectors (AWVs) and one or more bitloading vectors (BLVs) by using the first message in accordance with a predetermined rule and transmits a second message including information pertinent to the AWVs and the BLVs to the first communications device. The first communications device further communicates with the second communications device about an AWV selected from the AWVs and the first and second communications devices apply the selected AWV to the corresponding antennas before exchanging data. The data includes a header carrying information pertinent to a BLV selected from the BLVs used to encode the data and a payload is transmitted to the second communications device. The second communications device decodes the data in accordance with the selected BLV.