Radio Communication Apparatus Frequency Hopping Idle Channel Check
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Solution Overview
Problem
The existing radio communication systems, such as the CBTC system, face interference issues due to the use of shared frequency bands with other systems like wireless LAN and Bluetooth, leading to unstable communication and high probability of collision with interference sources, especially when an interference source occupies a channel at a fixed or higher ratio.
Innovation Solution
A radio communication apparatus that performs frequency hopping using multiple antennas and transceiver units, with a radio control unit that checks the idle state of frequency channels before transmission, ensuring each unit uses a different frequency and only transmits when the channel is determined to be idle within a predetermined time, thereby avoiding interference and maintaining high transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If frequency hopping is performed without checking channel idle state, then transmission speed is maintained, but communication stability deteriorates due to interference collisions
Solution Approach 1:
The system performs channel idle state checking before transmission begins. The radio control unit instructs transceiver units to check whether the frequency channel is idle before data transmission, preventing collisions with interference sources in advance while maintaining transmission speed
2Reliability
If channel idle state checking is performed, then communication stability improves, but transmission efficiency deteriorates due to additional check time
Solution Approach 1:
Each transceiver unit autonomously checks the idle state of its assigned frequency channel and independently decides whether to transmit. This distributed self-checking mechanism eliminates the need for centralized coordination overhead, minimizing the time penalty of channel checking while ensuring communication stability
3Device complexity
If multiple transceiver units use the same frequency channel, then device complexity is reduced, but harmful interference increases due to collisions
Solution Approach 1:
Each transceiver unit is assigned a unique frequency channel for transmission. The hopping control unit ensures that each transceiver unit uses a different frequency at the same time, creating local frequency differentiation that eliminates collisions while keeping the overall system structure simple
Data Source
AI summary
A radio communication apparatus includes antennas, transceiver units respectively connected to the antennas, and a radio control unit that controls the transceiver units, simultaneously inputs same transmission data to the transceiver units, and instructs, every switching cycle of frequency hopping, the transceiver units to start check processing for an idle state of frequency channels. The transceiver units respectively include hopping control units that switch the frequency channels every fixed time in synchronization with a communication partner and control such that each of the transceiver units uses a different frequency at the same hour. When determining that a frequency channel is in an idle state before a predetermined time elapses from the start of the check processing for an idle state, the transceiver units transmit the transmission data to the communication partner using the frequency channel.