Matched Filter Reduces Fronthaul Bandwidth in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face high data-rate requirements for fronthauls due to redundant information transmission, which increases bandwidth demands and limits flexibility in the separation of baseband processing units (BBUs) and remote radio heads (RRHs).
Innovation Solution
Implementing a matched filter to reduce redundancy in communication signals before transmission over the fronthaul, allowing only essential information to be transmitted, thereby reducing bandwidth requirements and enabling greater flexibility in the placement of BBU and RRH components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant information is transmitted over the fronthaul, then complete signal information is preserved, but bandwidth requirements increase
Solution Approach 1:
The patent extracts and removes redundant information from the baseband signal before transmission over the fronthaul. The matched filter identifies and eliminates redundant signal components while retaining essential information, thereby reducing the quantity of data transmitted without compromising signal integrity.
Solution Approach 2:
The patent changes the parameter of signal representation by applying a matched filter that transforms the signal into a more efficient format. This parameter transformation reduces the bandwidth requirement while maintaining the essential information content needed for reliable communication.
2Reliability
If BBU and RRH are co-located, then direct communication connection is achieved, but deployment flexibility is reduced
Solution Approach 1:
The patent segments the base station into separate functional units (BBU and RRH) that can be deployed independently. The matched filter at the RRH enables each unit to operate autonomously with reduced dependency on direct physical connection, allowing flexible deployment while maintaining reliable communication.
Solution Approach 2:
The matched filter acts as an intermediary that processes signals locally at the RRH, reducing the burden on the fronthaul connection. This intermediary function enables reliable communication even when BBU and RRH are physically separated, thereby supporting deployment flexibility.
3Quantity of substance
If matched filter is implemented, then bandwidth requirements are reduced, but signal processing complexity increases
Solution Approach 1:
The matched filter performs preliminary signal processing at the RRH before transmission over the fronthaul. By pre-processing and removing redundancy in advance, the system reduces bandwidth requirements while the processing complexity is managed through efficient filter design and implementation.
Data Source
AI summary
A system and method of reducing data-rate requirements of fronthauls for wireless communication is disclosed. In one aspect, the system includes a baseband processing unit and a remote radio head remotely located from the baseband processing unit. The remote radio head is configured to transmit and receive communication signals with the baseband processing unit. The system can also include a fronthaul configured to provide a communication channel between the baseband processing unit and the remote radio head for the communication signals, and a matched filter configured to filter out redundant information from the communications signals before the communications signals are provided to the fronthaul.