Digital IIR Filter for Millimeter-Wave Signal Equalization
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Solution Overview
Problem
Existing communication networks face challenges in efficiently transmitting millimeter-wave signals over long distances due to phase uncertainty and delay spread, especially in dense repeater deployments, which leads to signal distortion and interference.
Innovation Solution
A digital Infinite Impulse Response (IIR) filter is implemented in the digital domain after analog-to-digital conversion, using a direct conversion architecture to achieve equalization, and phase synchronization is ensured through carrier phase acquisition and symbol clock synchronization, allowing for coherent signal retransmission and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If millimeter-wave signals are transmitted over long distances through multiple repeater nodes, then transmission coverage is extended, but phase uncertainty and delay spread increase causing signal distortion and interference
Solution Approach 1:
The system performs preliminary carrier phase acquisition and symbol clock synchronization before signal retransmission. Each repeater node预先 acquires phase information and synchronizes clock timing to ensure that when signals are retransmitted over extended distances, they maintain phase coherence and do not suffer from cumulative phase uncertainty or delay spread that would cause distortion.
2Reliability
If digital IIR filter is implemented for signal equalization, then signal distortion is reduced, but device complexity increases
Solution Approach 1:
The system changes the parameters of the signal by applying digital IIR filtering in the frequency domain. By transforming the signal to the frequency domain, applying the IIR filter transfer function, and then transforming back, the system achieves sophisticated signal equalization and distortion reduction without requiring complex time-domain filtering hardware at each node.
3Reliability
If phase synchronization is ensured through carrier phase acquisition and symbol clock synchronization, then signal interference is reduced, but processing time increases
Solution Approach 1:
The system replaces mechanical or hardware-based synchronization mechanisms with software-defined signal processing approaches. Carrier phase acquisition and symbol clock synchronization are achieved through digital signal processing algorithms rather than hardware timing circuits, allowing for flexible and efficient phase coherence maintenance without excessive processing delays.
Data Source
AI summary
A communication network includes nodes. The nodes are capable of communicating over a current generation network, which will include 5G before long. One, some, or all of the nodes are also capable of communicating over a previous generation network, to which 4G will be relegated before long. A third node receives a first signal from a first node over the current generation network, a second signal that is a retransmission of the first signal from a second node over the current generation network, and network dimensional parameters from the first node and/or the second node over the previous generation network. The network dimensional parameters enable the third node to determine precise locations of the first node and the second node. Using a function of the network dimensional parameters, the third node can correlate the first signal and the second signal and generate a simplified signal therefrom.