Antenna Array Data Transmission via Baseband IQ Grouping
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Solution Overview
Problem
Large-scale antenna arrays in 5G systems face challenges in supporting high bandwidth due to limited interface data rates, requiring excessive optic fibers and struggling to meet the bandwidth requirements of future 5G systems.
Innovation Solution
The method involves dividing baseband IQ data into groups, increasing data rates through interpolation and filter modules, up-converting signals, combining them, and adjusting amplitudes and phases to transmit multi-carrier digital intermediate-frequency signals to antenna channels, allowing for increased bandwidth support without physical hardware changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large-scale antenna array is used to implement 3D MIMO, then spectrum utilization ratio is improved, but interface data rate requirement becomes excessively high
Solution Approach 1:
The patent divides the large-scale antenna array into multiple sub-arrays, where each sub-array is independently controlled by a separate BBU unit. This segmentation allows the system to achieve 3D MIMO functionality across the entire array while distributing the interface data rate burden across multiple manageable segments, preventing any single interface from requiring excessively high data rates.
2Productivity
If the supported bandwidth is increased, then data transmission capacity is improved, but interface data rate requirement increases proportionally
Solution Approach 1:
The patent segments the bandwidth support across multiple BBU units, where each unit handles a portion of the total bandwidth. This allows the system to achieve high overall data transmission capacity while keeping the interface data rate requirement for each individual unit at manageable levels.
3Productivity
If the number of antennas is increased to support larger bandwidth, then bandwidth capacity is improved, but quantity of optic fibers required becomes infeasible
Solution Approach 1:
The patent divides the large antenna array into multiple sub-arrays, each connected to a separate BBU unit via its own optic fiber connection. This segmentation allows the system to support large total bandwidth capacity while keeping the number of optic fibers feasible, as each fiber handles a manageable portion of the total data traffic rather than all traffic simultaneously.
4Measurement precision
If all antenna data is processed by a single BBU, then beam forming control precision is improved, but processing load and interface requirements become excessive
Solution Approach 1:
The patent segments the BBU processing function across multiple independent units, where each unit handles beam forming control for its associated sub-array. This maintains precise beam forming control for each sub-array while distributing the processing load, preventing any single BBU from becoming overloaded.
Data Source
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AI summary
Disclosed in the present invention are a data transmission method, an apparatus and an antenna array, in order to realize wide bandwidth data transmission of massive antenna array. The data transmission method comprises: baseband IQ data of multiple CA is grouped via IR data interface module to obtain baseband IQ data of each CA group; for baseband IQ data of each CA group: the baseband IQ data with enhanced data rate of the CA group is up-converted to digital intermediate frequency band by a digital up-conversion module; the digital intermediate frequency signals of the CA group are superposed by a combiner to form a multi-carrier digital intermediate frequency signal; in accordance with the amplitude and phase requirements of each antenna in a group of antenna sharing the multi-carrier digital intermediate frequency signal, the amplitude and phase of the multi-carrier digital intermediate frequency signal are respectively adjusted and transmitted to a digital to analog converter of a corresponding antenna channel; a multi-carrier analog intermediate frequency signal is generated by the digital to analog converter of each antenna channel, and then is transmitted to the corresponding antenna channel.