Signal Combining for Interference Reduction in Wireless Transmitters

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Solution Overview

Problem

In wireless communication systems, interference between signals with adjacent or overlapping bandwidths is a challenge due to differences in signal characteristics, such as receiver tolerances and transmission powers, leading to adjustments that may render one or both signals unusable by receivers.

Innovation Solution

The solution involves combining signals at different strengths and transmitting the combined signal from a single antenna, using techniques like frequency-domain multiplexing and a combiner system to adjust signal ratios, ensuring that one signal does not interfere with the other, thereby improving reception and decoding capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If signals with adjacent or overlapping bandwidth are transmitted from proximate locations, then bandwidth utilization is improved, but interference between signals increases

Engineering Contradiction:

Improvebandwidth utilizationVSAvoidinterference between signals

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent combines multiple signals with adjacent or overlapping bandwidths into a single transmitted signal. The combiner device integrates signals from different sources (e.g., cellular and broadcast signals) and transmits them together through a single antenna, allowing multiple signals to share the same spatial resource without requiring separate transmission paths, thus improving bandwidth utilization while managing interference through controlled combination.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent adjusts signal parameters including transmission power levels and frequency allocations to optimize the combination of signals. By dynamically controlling the power levels of individual signals within the combined transmission and selecting appropriate frequency bands, the system manages interference between signals while maintaining their usability by respective receivers.

Inventive Principle:

Principle #35Parameter changes

2Strength

If transmission power of one signal is increased to improve reception, then signal strength is improved, but interference with adjacent signals increases

Engineering Contradiction:

Improvesignal strengthVSAvoidinterference with adjacent signals

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent applies different transmission power levels to different signals within the combined transmission based on their specific requirements and interference characteristics. Each signal can be transmitted at an optimized power level that ensures adequate reception for its intended receivers while minimizing harmful interference to adjacent signals, allowing non-uniform power distribution across different signal types.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts transmission power levels based on real-time conditions and signal requirements. The combiner device can modulate the power of individual signals within the combined transmission, allowing adaptive control that responds to changing interference conditions and receiver requirements to maintain optimal signal strength while minimizing interference.

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If adjustments are made to mitigate interference between signals, then interference is reduced, but signal usability by receivers may be compromised

Engineering Contradiction:

Improveinterference between signalsVSAvoidsignal usability by receivers

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent performs preliminary signal processing and combination before transmission, where the combiner device pre-adjusts signal parameters and power levels to optimize the balance between interference reduction and signal usability. By preparing the signal combination in advance with appropriate power allocation and frequency selection, the system ensures that receivers can successfully decode their intended signals without excessive interference from adjacent signals.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates feedback mechanisms to monitor signal reception quality and interference levels, allowing dynamic adjustment of transmission parameters. Based on feedback from receivers and channel conditions, the combiner device can modify power levels and signal characteristics to maintain optimal performance while minimizing interference, ensuring continuous adaptability to changing conditions.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11153023B2Reducing interference by combining signals at different strengths and transmitting the combined signal from an antenna

Publication Date: 2021.10.19 AT&T MOBILITY II LLC

AI summary

The technologies described herein are generally directed toward facilitating indicating frequency and time domain resources in communication systems with multiple transmission points. According to an embodiment, a system can comprise a processor, a base transceiver station, and a memory that can store executable instructions that, when executed by the processor, can facilitate performance of operations. The operations can include receiving a first signal. The operations can further include combining the first signal with a second signal resulting in a combined signal, wherein the first signal can be combined using a different weight than is applied to the second signal. The operations can further include broadcasting by an antenna of the base transceiver station, the combined signal.