Localized Single Frequency Network for Subcarrier Attenuation
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Solution Overview
Problem
In cellular communication systems, multipath environments cause subcarrier attenuation, leading to low signal-to-noise ratios and difficulties in demodulating and decoding information, which negatively impact link reliability and quality of service.
Innovation Solution
The method involves detecting attenuated carrier frequencies and selecting multiple transmitting devices to relay the affected frequencies, allowing them to transmit data over these frequencies, thereby creating a localized frequency network that compensates for subcarrier attenuation without increasing interference in neighboring cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single base station transmits all carrier frequencies, then the system structure is simple, but subcarrier attenuation occurs in multipath environments leading to poor signal quality
Solution Approach 1:
The patent divides the transmission function into multiple base stations, where each base station transmits only a subset of carrier frequencies (specifically those not attenuated in its coverage area). This segmentation allows the system to overcome subcarrier attenuation by distributing the transmission load across multiple stations, thereby improving signal quality without requiring a single base station to handle all frequencies.
Solution Approach 2:
The patent combines the transmission capabilities of multiple base stations to form a coordinated transmission system. By merging the transmitted signals from multiple base stations on the same carrier frequencies, the system creates a localized single frequency network that improves signal reliability through signal combining at the receiver, while each individual base station maintains a simple transmission structure.
2Reliability
If multiple base stations transmit the same carrier frequencies, then signal quality improves through diversity, but interference increases in neighboring cells
Solution Approach 1:
The patent applies local quality by allowing multiple base stations to transmit the same carrier frequencies only in specific localized areas where attenuation occurs, rather than across entire neighboring cells. Each base station transmits carrier frequencies that are specifically attenuated in its local coverage area, creating a localized single frequency network that provides diversity gain without causing widespread interference to neighboring cells.
Solution Approach 2:
The system uses channel state information and attenuation detection feedback to dynamically determine which base stations should transmit which carrier frequencies. By monitoring the channel conditions and identifying attenuated subcarriers, the system can coordinate transmissions to provide diversity where needed while avoiding interference in areas where single base station transmission is sufficient.
3Reliability
If one base station increases transmission power to compensate for attenuation, then signal quality improves, but power consumption and interference increase
Solution Approach 1:
Instead of one base station increasing power for all carrier frequencies, the patent segments the transmission task so that multiple base stations each transmit at normal power levels on specific carrier frequencies where attenuation occurs. This distributes the power requirement across multiple stations, avoiding the need for any single station to consume excessive power while still achieving adequate signal quality through coordinated transmission.
Data Source
AI summary
A method, wireless communication network, and transmitting device that detects that one or more carrier frequencies have crossed a threshold, selects one or more helping transmitting devices to transmit the detected carrier frequencies, transmits the data assigned to the detected carrier frequencies to the selected helping transmitting devices, wherein the selected helping transmitting devices transmit the data over the detected carrier frequencies.