Cyclic Shift Sequence Pairs for Range and Velocity Measurement

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Solution Overview

Problem

Existing ZC sequences in wireless communication systems have limited measurable range and velocity, necessitating a solution to increase these capabilities.

Innovation Solution

Employing a cyclic shift sequence pair with distinct root indexes and cyclic shifts based on delay and Doppler indices to form a low ambiguity zone, reducing the impact of side peaks in ambiguity functions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single ZC sequence is used for random access signal, then the sequence structure is simple and easy to generate, but the measurable range and velocity are limited

Engineering Contradiction:

Improvesequence structure complexityVSAvoidmeasurable range and velocity

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent divides a single ZC sequence into multiple sequences by using different root indices. Specifically, it employs a first ZC sequence with a first root index and a second ZC sequence with a second root index, where the root indices differ. This segmentation allows the system to measure both range and velocity simultaneously, overcoming the limitation of single-sequence measurements while maintaining manageable complexity through systematic sequence generation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from one-dimensional range measurement using a single ZC sequence to two-dimensional joint measurement of range and velocity by introducing multiple ZC sequences with different root indices. The first ZC sequence is used for range measurement while the second ZC sequence enables velocity measurement, effectively adding a new measurement dimension without significantly increasing system complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If cyclic shifts are applied to increase measurement capability, then more sequence variants are available, but side peaks in ambiguity function increase causing measurement deviation

Engineering Contradiction:

Improvesequence varietyVSAvoidtiming velocity measurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies different cyclic shift strategies to different sequences based on their specific roles. The first ZC sequence uses cyclic shifts optimized for range measurement with appropriate guard intervals, while the second ZC sequence uses cyclic shifts tailored for velocity measurement. This localized optimization ensures each sequence performs its specific function with high precision while minimizing side peak interference in its respective measurement domain.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces a third ZC sequence with a third root index that serves as an intermediary to reduce side peak interference. This intermediate sequence helps suppress the side peaks generated by cyclic shifts in the first and second sequences, thereby improving the accuracy of timing and velocity measurements without reducing the variety of available sequences.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If multiple ZC sequences with different root indices are used, then measurable range and velocity increase, but the system complexity increases

Engineering Contradiction:

Improvemeasurable range and velocityVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent designs the multiple ZC sequences with different root indices to serve multiple functions simultaneously. The first ZC sequence with its first root index handles range measurement, the second ZC sequence with its second root index handles velocity measurement, and the third ZC sequence with its third root index reduces side peak interference. This multi-functional design allows the system to achieve enhanced measurement capabilities while managing complexity through systematic and standardized sequence generation and processing procedures.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260019317A1Communication method, communication apparatus, and communication system

Publication Date: 2026.01.15 HUAWEI TECH CO LTD

AI summary

Embodiments of this application provide a communication method, a communication apparatus, and a communication system. An example method includes: A first apparatus obtains a cyclic shift sequence pair, where the cyclic shift sequence pair includes a first sequence and a second sequence, the first sequence is obtained by performing cyclic shifts on a first root sequence respectively based on a delay cyclic shift index and a Doppler cyclic shift index, the second sequence is obtained by performing the cyclic shifts on a second root sequence respectively based on the delay cyclic shift index and the Doppler cyclic shift index, and a first root index of the first root sequence is different from a second root index of the second root sequence; and outputs the cyclic shift sequence pair.