Spread-Spectrum Power Detection With Partial FEC Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current communication systems face challenges in efficiently compensating for information not received, or erasures, in Random Phase Multiple Access (RPMA) communication systems, which affects the reliability and accuracy of data transmission.
Innovation Solution
The implementation of a method and system that uses forward error correction techniques, specifically Reed Solomon encoding, to create and transmit encoded signals, where the transmission of a second predetermined part of the encoded signal is terminated upon successful decoding by the receiver, and the use of acknowledgments and noise characteristics to determine successful decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If forward error correction techniques are used to compensate for erasures, then reliability of data transmission is improved, but device complexity increases
Solution Approach 1:
The encoded signal is divided into a first predetermined part and a second predetermined part. The first part is transmitted regardless of decoding success, while the second part is transmitted only if needed. This segmentation allows the system to provide error correction capability while avoiding unnecessary transmission of redundant data, thus balancing reliability improvement with device complexity management.
Solution Approach 2:
Instead of transmitting the entire encoded signal in all cases, the system transmits only the first predetermined part unconditionally and conditionally transmits the second predetermined part based on decoding success. This partial action approach provides sufficient error correction capability without always incurring the full complexity cost of complete error correction transmission.
2Loss of time
If the transmission of the second predetermined part is terminated early upon successful decoding, then loss of time is reduced, but reliability may worsen due to potential premature termination
Solution Approach 1:
The system uses feedback mechanisms where the receiver sends acknowledgments indicating whether successful decoding has occurred. The transmitter monitors these feedback signals and terminates transmission of the second predetermined part only when confirmed that successful decoding has been achieved. This feedback loop ensures that early termination does not compromise reliability while still reducing transmission time.
3Measurement precision
If acknowledgments are used to determine successful decoding, then measurement precision of decoding status is improved, but device complexity increases
Solution Approach 1:
The receiver performs self-service by autonomously determining whether successful decoding has occurred and generating appropriate acknowledgment signals. This self-service mechanism provides precise decoding status detection without requiring complex external monitoring or control systems, thus improving measurement precision while minimizing the increase in device complexity.
Data Source
AI summary
This disclosure relates to method, device and system for selecting a device for communication in a communication system. A node receives a spread signal from a first transmitter and a second transmitter. The node despreads the spread signal with a first spreading code into a first frame and determines a first receive signal strength indicator (RSSI) from the first frame. The node despreads the spread signal with a second spreading code into a second frame and determines a second RSSI from the second frame. The node selects an access point based in part on the first RSSI and the second RSSI. The node transmits an uplink signal to the access point based on a slot start time and a random timing offset. The node transmits while a portion of a second signal is transmitted from a second node such that both the uplink signal and the second signal are received.