Distributed Interference Compression for Wireless Throughput Scaling
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Solution Overview
Problem
Current wireless communication systems face limitations in throughput due to interference from multiple transmitter-receiver pairs, where delayed channel gain information leads to inefficient interference removal, resulting in throughput that does not scale with the number of pairs, often being limited to two symbols per time slot.
Innovation Solution
The solution involves using repetition coding and distributed interference compression to generate identical interference at all receivers, allowing transmitters to broadcast a compressed interference signal, which is then subtracted at receivers to achieve an interference-free signal, thereby enhancing throughput proportional to the square root of the number of transmitter-receiver pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If delayed channel gain information is used for interference removal, then interference cancellation is enabled, but throughput does not scale with the number of transmitter-receiver pairs
Solution Approach 1:
The patent segments the interference cancellation process by dividing the set of transmitter-receiver pairs into groups. Each transmitter only needs to cancel interference from a subset of other transmitters rather than all transmitters. This segmentation enables the system to handle a larger number of pairs without linearly increasing the complexity or number of retransmissions required, thus allowing throughput to scale with the number of pairs.
2Quantity of substance
If the number of transmitter-receiver pairs increases, then system capacity increases, but the number of interference retransmissions required increases proportionally
Solution Approach 1:
The patent divides the interference cancellation task into segments where each transmitter is responsible for canceling interference from only a portion of other transmitters. This segmentation reduces the number of retransmissions each transmitter must perform, preventing the total number of retransmissions from increasing proportionally with the number of pairs.
Solution Approach 2:
The patent implements partial interference cancellation where each transmitter cancels interference from only a subset of other transmitters rather than all of them. This partial action is sufficient to enable throughput scaling, as complete cancellation from all transmitters is not necessary for each receiver to achieve its target throughput.
3Object-affected harmful factors
If each transmitter cancels interference from all other transmitters, then complete interference removal is achieved, but system complexity increases
Solution Approach 1:
The patent segments the interference cancellation responsibility among transmitters, so each transmitter handles only a subset of interference sources. This segmentation reduces the computational complexity and processing requirements for each transmitter, making the system more scalable while still achieving effective interference cancellation through coordinated partial cancellation.
Data Source
AI summary
The disclosure pertains to wireless communications and, more particularly, to the exploitation of channel gain information, advantageously where more than two transmitter/receiver pairs transmit information over a shared medium. The disclosure applies distributed interference compression (23) at the receivers (receiver 1 (8), . . . , receiver k (9), . . . , and receiver K (10)) and repetition coding (13) at the transmitters (transmitter 1 (1), . . . , transmitter k (2), . . . , transmitter K (3)). Repetition coding repeats the same symbol stream (11) several times and the distributed interference compression (23) reduces the number of interference retransmissions (15) required to obtain the interference free signal (26). The throughput achieved by previous solutions is limited to two symbols per time slot, whereas in the present disclosure throughput is enhanced and is proportional to the square root of the number of transmitter/receiver pairs considered.