Dynamic Phase Changer for Wireless Transmission Reliability
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Solution Overview
Problem
Existing transmission apparatuses do not consider transmitting modulated signals to multiple terminals using identical times and identical frequencies, leading to potential poor reception states in environments with dominant direct waves.
Innovation Solution
A transmission apparatus capable of transmitting modulated signals to multiple terminals by using identical times and identical frequencies, thereby avoiding steady poor reception states and improving data reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase change is performed regularly in a period of 9 with nine phase change values provided, then it is possible to avoid a steady reception state in environments with dominant direct waves, but the device complexity increases due to the need for multiple phase change values and periodic control
Solution Approach 1:
The phase change period is made variable rather than fixed. The phase changer dynamically adjusts the phase change period based on reception quality feedback, switching between a first period (when quality is good or improving) and a second period (when quality deteriorates). This dynamic adaptation allows the system to maintain reliability while reducing unnecessary complexity by only applying complex phase change patterns when needed.
Solution Approach 2:
The phase change period parameter is changed based on reception conditions. When reception quality deteriorates, the system switches to a second period that is different from the first period, effectively changing the operational parameter to adapt to varying channel conditions. This parameter adaptation resolves the contradiction by allowing simple operation under good conditions while providing complex control only when necessary for maintaining reliability.
2Reliability
If multiple phase change values are used to prevent steady reception states, then reception quality improves, but the control mechanism becomes more complex
Solution Approach 1:
The phase change control is driven by feedback from reception quality measurements. The phase changer receives indication information about reception quality and automatically adjusts its operation accordingly. This feedback mechanism simplifies operation because the system self-regulates based on actual performance, eliminating the need for manual configuration of complex phase change patterns while maintaining improved reception quality.
Solution Approach 2:
The phase change behavior is made dynamic and adaptive rather than static and predetermined. The system transitions between different phase change patterns (first period and second period) based on real-time reception conditions. This dynamic approach improves ease of operation by allowing the system to automatically adapt to changing conditions without requiring complex manual control, while still achieving the reliability benefits of varied phase changes.
3Ease of operation
If phase change is performed with a fixed period of 9, then the control mechanism is simple, but the system cannot adapt to varying reception conditions leading to steady poor reception states
Solution Approach 1:
The phase change period is transformed from a fixed value to a dynamic parameter that adapts to reception conditions. The system uses two different periods (first period and second period) and switches between them based on reception quality feedback. This dynamic behavior maintains ease of operation through automatic control while eliminating steady poor reception states by adapting to varying channel conditions.
Solution Approach 2:
The operational parameter (phase change period) is changed based on reception conditions. When reception quality deteriorates, the system switches from a first period to a second period, effectively changing the parameter to adapt to the new conditions. This parameter adaptation resolves the contradiction by maintaining simple automatic control while improving reliability through condition-dependent parameter adjustment.
Data Source
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AI summary
A transmission apparatus comprises: an error-correcting encoder configured to perform error-correcting on a bit sequence to generate a coded bit sequence; a mapper configured to modulate the coded bit sequence to generate a first symbol sequence and a second symbol sequence; a signal processor comprising a first phase changer, a second phase changer, a precoder, a third phase changer, a first inserter and a second inserter; wherein the precoder is configured to perform precoding on the first symbol sequence and the second symbol sequence to generate a first precoded signal and a second precoded signal, wherein a phase change after precoding is applied by the third phase changer to the second precoded signal; the first inserter inputs the first precoded signal, a pilot symbol signal, a preamble signal a control information symbol signal and a control signal and outputs, based on information about a frame configuration included in the control signal, a first modulated signal; the second inserter inputs the second precoded signal, a pilot symbol signal, the preamble signal, the control information symbol signal and the control signal and outputs, based on the information about the frame configuration included in the control signal, a second modulated signal; a first radio section and a second radio section configured to transmit the first modulated signal and the second modulated signal via a first antenna section and a second antenna section, respectively; wherein the first phase changer and/or the second phase changer are configured to apply, when a phase change before precoding is enabled, at least one of a first phase change before precoding on the first symbol sequence and a second phase change before precoding on the second symbol sequence, respectively, an amount Vp(i) of the first phase change before precoding and an amount vp(i) of the second phase change before precoding being switched symbol by symbol.