Wireless Relay Modulation Scheme Estimation via Delay
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Solution Overview
Problem
The existing wireless communication technologies that use high-frequency bands for transmitting large amounts of data face significant attenuation with distance, leading to a small coverage area and increased costs due to the need for more base stations, and require synchronized Modulating Scheme and Coding Scheme (MCS) between relay stations, which increases signaling and decreases throughput.
Innovation Solution
A wireless communication apparatus that estimates the modulation scheme of another relay station based on the delay in relay transmission, allowing it to adjust its modulation scheme accordingly, eliminating the need for synchronized MCS signaling between relay stations and reducing throughput loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay stations use the same MCS to carry out relay transmission, then diversity gain can be obtained, but signaling overhead increases and throughput decreases
Solution Approach 1:
Each relay station autonomously estimates the modulation scheme of other relay stations based on delay information and independently adjusts its own modulation scheme accordingly, eliminating the need for centralized coordination or signaling between relay stations while maintaining synchronized operation
Solution Approach 2:
Relay stations dynamically adjust their modulation scheme parameters based on estimated delay values from other relay stations, transitioning from fixed synchronized MCS to adaptive parameter adjustment that maintains synchronization without additional signaling
2Productivity
If high frequency radio bands are utilized to transmit large amounts of data, then transmission rate increases, but attenuation due to transmission distance becomes significant
Solution Approach 1:
Mobile stations are utilized as intermediary relay stations between base stations and remote users, enabling multi-hop communication that extends coverage area while maintaining high transmission rates through high-frequency band utilization
Solution Approach 2:
The communication architecture transitions from two-dimensional base station coverage to three-dimensional relay-based mesh network, allowing flexible routing and signal combination that compensates for distance attenuation
Data Source
AI summary
A wireless communication method capable of preventing reduction of the throughput. According to this wireless communication method, in a frame (2), a relay station (1) decides that the amount of delay to be Δt2 because the modulation scheme of a relayed signal is 16 QAM, while another relay station (2) decides that the delay amount be Δt4 because the modulation scheme of a relayed signal is QPSK. The relay station (1) transmits, at Δt2 of the frame (2), the relayed signal, the modulation scheme of which is 16 QAM, to abase station. On the other hand, the relay station (2) detects, by Δt4, the fact that the relay station (1) transmitted the relayed signal at Δt2, and estimates, from the detected fact, that the modulation scheme used by the relay station (1) was 16 QAM. The relay station (2) then updates its modulation scheme from the initially established modulation scheme of QPSK to the same modulation scheme of 16 QAM as the relay station (1), and modulates the relayed signal by use of 16 QAM and then transmits it to the base station.