Aggregated RF Channel Single Carrier Modulation
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Solution Overview
Problem
Current wireless technologies operating in the microwave frequency band cannot achieve multi-gigabit data rates for wireless backhauling, as direct combination of low data rate systems is inefficient in utilizing bandwidth, results in high peak-to-average power ratio, and requires multiple separate processing modules, leading to high implementation costs.
Innovation Solution
The method involves aggregating multiple RF channels into wider bandwidth aggregated sub-bands, using single carrier modulation on the center frequency of each sub-band, which reduces the number of carriers and eliminates the need for guard bands, thereby improving spectral and power efficiency and reducing implementation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple low data rate wireless systems are directly combined to achieve multi-gigabit data rates, then the total bandwidth can be increased, but spectral efficiency deteriorates due to required guard bands between channels
Solution Approach 1:
The patent merges multiple adjacent RF channels into a single aggregated sub-band, eliminating the need for guard bands between individual channels. This combining approach allows continuous bandwidth utilization while achieving multi-gigabit data rates through the aggregated channel capacity.
Solution Approach 2:
The patent segments the aggregated sub-band into multiple virtual carriers for independent data stream transmission. This segmentation enables parallel data transmission across the aggregated bandwidth without requiring physical guard bands, resolving the contradiction between high data rate and bandwidth utilization.
2Productivity
If multiple RF channels are combined to form a multicarrier signal, then data rate increases, but power efficiency deteriorates due to high peak-to-average power ratio
Solution Approach 1:
The patent combines multiple RF channels into a single aggregated sub-band and transmits using a single carrier waveform, eliminating the high peak-to-average power ratio associated with traditional multicarrier signals. This merging approach maintains high data rate capability while significantly improving power efficiency.
3Reliability
If separate baseband processing modules and RF chains are used for individual RF channels, then channel independence is maintained, but device complexity increases
Solution Approach 1:
The patent merges multiple RF channels into a single aggregated sub-band that is processed by a single baseband processing module and RF chain. This consolidation reduces device complexity while maintaining channel independence through virtual carrier separation and digital signal processing techniques.
4Reliability
If guard bands are enforced between RF channels to prevent interference, then channel interference is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent merges adjacent RF channels into an aggregated sub-band, eliminating the need for guard bands between channels. The aggregated structure allows continuous bandwidth utilization while interference prevention is achieved through coordinated transmission and reception processing across the merged channels.
Data Source
Figure 1A
Figure 1B
Figure 2~3
AI summary
A wireless data communications method and transmitter are disclosed. A transmitter (402N, 800) includes a module (802) configured to group adjacent sub-bands from among a set of transmission radio frequency channels assigned to a terminal into a plurality of aggregated sub-bands. A single carrier modulator (804) is configured to modulate data symbols in at least some of said aggregated sub-bands. A combining module (808) is configured to combine said single carrier modulated signals into a multi-carrier signal. A receiver (502N, 900) is also provided in conjunction with the transmitter (800) to constitute a transceiver.