Historical Signal Interference Cancellation for Wireless Bandwidth Reduction
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Solution Overview
Problem
Conventional data recovery techniques in wireless receivers consume substantial bandwidth when re-transmitting serving data or FEC bits, especially in environments with poor channel quality, such as at the cell edge, necessitating more efficient mechanisms.
Innovation Solution
Implementing historical interference cancellation methods where a receiver stores interference signals and requests information related to interfering data transmissions, using this information to decode serving data transmissions using SIC or joint processing techniques, thereby reducing the need for re-transmitting serving data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional data recovery techniques re-transmit serving data or FEC bits, then data recovery reliability is improved, but bandwidth consumption increases substantially
Solution Approach 1:
The patent segments the data recovery process into two parts: (1) re-transmitting only the interfering data portion that caused the collision, and (2) using the receiver's SIC capability to separate and recover the serving data from the stored interference signal combined with the re-transmitted interfering data. This segmentation allows selective re-transmission of only the necessary portion, reducing bandwidth consumption while maintaining data recovery reliability.
Solution Approach 2:
The patent applies preliminary action by having the receiver store the interference signal in memory before the re-transmission occurs. This preliminary storage of the collided signal enables the receiver to combine it with the re-transmitted interfering data and perform SIC to recover the serving data, eliminating the need to re-transmit the entire serving data packet.
2Reliability
If re-transmission of serving data is performed to ensure data recovery, then data recovery reliability is improved, but network resource usage increases
Solution Approach 1:
The patent segments the re-transmission task to send only the interfering data portion rather than the entire serving data packet. The receiver's SIC functionality then segments the recovery process by separating the serving data from the interfering data through signal processing, achieving reliable recovery while improving network resource efficiency.
Solution Approach 2:
The patent enables the receiver to perform self-service data recovery by utilizing its own SIC capability. Instead of relying on the transmitter to re-transmit the complete serving data, the receiver services itself by combining the stored interference signal with the re-transmitted interfering data and independently recovering the serving data through SIC processing.
3Productivity
If SIC techniques are used to separate serving data from interfering data, then spectral efficiency is improved, but receiver complexity increases
Solution Approach 1:
The patent reduces receiver complexity through preliminary action by having the receiver store the interference signal in memory before SIC processing is required. This preliminary storage eliminates the need for complex real-time interference separation during the initial decoding attempt, allowing the receiver to use the stored signal in combination with re-transmitted interfering data for simpler subsequent SIC processing.
Solution Approach 2:
The patent introduces the stored interference signal as an intermediary element that facilitates SIC processing. By having the receiver store the original interference signal and combining it with the re-transmitted interfering data, a mediator signal is created that enables the SIC algorithm to more effectively separate the serving data from interference, improving spectral efficiency while managing receiver complexity.
Data Source
AI summary
Historical decoding in accordance with signal interference cancellation (SIC) or joint processing may reduce the amount of data that is re-transported across a network following an unsuccessful attempt to decode a data transmission. In one example, historical decoding is performed in accordance with interference cancellation by communicating information related to interfering data (rather than information related to serving data) following a served receiver's unsuccessful attempt to decode an interference signal. The information related to the interfering data may be the information bits carried by the earlier interfering data transmission or parity information (e.g., forward error correction (FEC) bits, etc.) related to the earlier interfering data transmission.