Interference Cancellation for Same RF Carrier Signals
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Solution Overview
Problem
Conventional wireless communication networks face interference issues when using simultaneous transmission and reception techniques, which compromise signal integrity and restrict network operations, particularly in scenarios where devices without interference cancellation capabilities are near each other.
Innovation Solution
Implementing interference cancellation units in wireless communication devices that perform successive interference cancellation operations to mitigate interference between uplink and downlink signals sharing the same RF carrier, allowing for simultaneous transmission and reception without distance constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmission and reception using the same RF carrier is implemented, then network handling capacity and flexibility are improved, but signal interference occurs compromising integrity
Solution Approach 1:
The patent applies successive interference cancellation (SIC) to convert the harmful interference between simultaneous uplink and downlink signals into a solvable problem. The receiver identifies and subtracts the interfering signal components through multiple cancellation stages, transforming the interference from a system-limiting factor into a manageable challenge that enables full-duplex operation on the same RF carrier
2Adaptability or versatility
If devices without interference cancellation capabilities are placed near each other, then network flexibility is improved, but interference between devices occurs
Solution Approach 1:
The patent introduces an interference cancellation unit as an intermediary component within the receiver architecture. This unit acts as a mediator that processes the received signal, identifies interfering components from nearby transmitting devices, and subtracts them before further processing, enabling devices to operate in close proximity without mutual interference
3Reliability
If distance-based constraints are imposed on device placement, then interference is reduced, but network operation flexibility is restricted
Solution Approach 1:
The patent extracts the interference cancellation functionality from the physical layer constraints and implements it as a signal processing function. By removing the need for distance-based separation through active interference subtraction, the system achieves both high signal quality and unrestricted device placement flexibility
Data Source
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AI summary
Embodiments of wireless communication devices (WCDs) and methods for cancelling signal interference in the WCDs are generally described herein. Some of these embodiments describe a WCD that includes a receiver to generate a received signal, which includes at least a first signal transmitted to the WCD by a network station that operates in a full-duplex mode while the WCD operates in a half-duplex mode. The WCD also includes a module to generate an interference cancellation signal for the received signal based on interference information obtained from at least the received signal. The interference information is associated with a second signal transmitted to the network station by an additional device. The first signal is transmitted while the second signal is transmitted. The first and second signals include the same radio-frequency (RF) carrier.