Spreading Resource Blocks for 5G Channel Diversity
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Solution Overview
Problem
In 5G communication systems using higher frequency bands, the orthogonality of data symbols transmitted through different resources is damaged due to fading, leading to reduced channel gain and difficulty in detecting data symbols, especially in two-dimensional time-frequency resources.
Innovation Solution
The method involves performing channel measurement between base stations and terminals to determine the size of multiple spreading resource blocks in a second two-dimensional domain, and then transmitting information about these sizes to configure the communication procedure, where data symbols in a first two-dimensional domain are spread to and despread from these blocks, using techniques like sounding reference signals and channel state information-reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data symbols are transmitted in two-dimensional time-frequency resources, then communication capacity is improved, but channel gain is reduced due to fading
Solution Approach 1:
The patent transforms the transmission domain from conventional two-dimensional time-frequency resources to a three-dimensional structure by introducing the delay domain. Data symbols are spread across multiple time-frequency resource blocks that are delayed by different amounts, creating a delay-diversity dimension. This dimensional extension allows the system to maintain high communication capacity while achieving diversity gain through multiple delayed copies of each symbol, thereby resolving the contradiction between capacity and reliability.
2Reliability
If data symbols are spread to multiple spreading resource blocks, then diversity gain is improved, but device complexity increases
Solution Approach 1:
The patent segments the spreading operation into two independent stages: first, data symbols are spread across multiple time-frequency resource blocks in the frequency-time domain; second, each spread symbol is copied and delayed by different amounts to create multiple delayed copies. This segmentation simplifies the overall complexity by breaking down the complex spreading operation into manageable, independent steps that can be implemented efficiently in practical communication systems.
Data Source
AI summary
An operation method of a base station in a communication system may include: performing an operation for channel measurement between the base station and a terminal; determining a size of multiple spreading resource blocks configured in a second two-dimensional (2D) domain based on a result of the channel measurement; transmitting information indicating the size of the multiple spreading resource blocks to the terminal; and performing a communication procedure with the terminal based on the multiple spreading resource blocks having the size.