Time Domain Orthogonal Sequences for Wireless Reference Signal Interference
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently distinguishing reference signals broadcast in different sectors while conserving channel resources, leading to interference from neighboring cell signals.
Innovation Solution
The implementation of a time domain orthogonal sequence applied to a reference sequence to generate a reference signal for broadcasting in each sector, allowing mobile stations to differentiate and attenuate interference from other sector signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If reference signals are broadcast in multiple sectors using the same channel resources, then channel resource efficiency is improved, but interference from neighboring cell signals increases
Solution Approach 1:
The patent segments the reference signal by applying different time domain orthogonal sequences to the same reference sequence in different sectors. This allows the system to reuse the same channel resources (time and frequency) across multiple sectors while maintaining signal distinguishability through sector-specific orthogonal sequences, thereby resolving the contradiction between resource efficiency and interference.
Solution Approach 2:
The patent introduces a time domain orthogonal sequence dimension to distinguish reference signals across sectors. By multiplexing the reference sequence with different orthogonal sequences in the time domain, the system creates an additional differentiation dimension that enables simultaneous transmission in multiple sectors without mutual interference, maintaining both resource efficiency and signal clarity.
2Device complexity
If the same reference sequence is used in all sectors, then device complexity is reduced, but ability to distinguish reference signals in different sectors deteriorates
Solution Approach 1:
The patent merges the reference sequence with time domain orthogonal sequences to create sector-specific reference signals. This combination allows the system to maintain a simple base reference sequence while adding orthogonal sequence multiplexing to enable sector differentiation, achieving both simplicity and distinguishability through the merged structure.
Solution Approach 2:
The patent creates copies of the reference sequence modulated by different time domain orthogonal sequences for each sector. These copies maintain the same basic reference structure for simplicity but differ in their orthogonal sequence components, enabling mobile stations to distinguish between sectors through correlation with the appropriate orthogonal sequence.
3Object-affected harmful factors
If time domain orthogonal sequences are applied to reference signals, then interference attenuation is improved, but signal processing complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where mobile stations correlate received signals with stored time domain orthogonal sequences to identify and attenuate interference. This feedback-based approach allows the system to dynamically distinguish and suppress interfering signals from neighboring sectors, improving interference attenuation while managing processing complexity through efficient correlation operations.
Data Source
AI summary
An apparatus for providing wireless coverage to a plurality of sectors includes means for generating a reference sequence, and means for applying a time domain orthogonal sequence to the reference sequence to generate a reference signal for broadcasting over one of the sectors. An apparatus for wireless communications within a sector includes means for receiving a broadcast within a sector, the received broadcast comprising a reference signal having a time domain orthogonal sequence applied to a reference sequence, and means for recovering the reference sequence from the received broadcast.