Joint Modulation of Data with Tone Reservation Signals
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Solution Overview
Problem
Conventional tone reservation techniques in wireless communications systems result in decreased throughput and poor spectral efficiency due to the allocation of subcarriers for tone reservation signals, leading to increased power consumption in power amplifiers.
Innovation Solution
The proposed solution involves jointly modulating data and tone reservation signals on the same subcarrier, using hard slicing to map tone reservation signals onto defined locations in a constellation map, and dynamically determining subcarrier allocation based on channel eigenvalues, allowing for improved spectral efficiency and reduced peak-to-average power ratio (PAPR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If subcarriers are allocated for tone reservation signals, then PAPR is reduced, but throughput and spectral efficiency decrease
Solution Approach 1:
The patent combines data modulation and tone reservation signal generation into a single joint process. Instead of allocating separate subcarriers for tone reservation, the system jointly modulates data and generates tone reservation signals on the same subcarriers, eliminating the need for dedicated reserved subcarriers while maintaining PAPR reduction benefits
Solution Approach 2:
The joint modulation scheme enables subcarriers to serve multiple functions simultaneously: carrying data information and generating tone reservation signals for PAPR reduction. This multi-functionality allows the same frequency resources to achieve both data transmission and peak power control objectives
2Loss of energy
If subcarriers are allocated for tone reservation signals, then PAPR is reduced, but spectral efficiency decreases
Solution Approach 1:
The patent merges the functions of data transmission and tone reservation into a unified joint modulation framework, allowing both objectives to be achieved on the same spectral resources without requiring separate allocations, thereby improving spectral efficiency while maintaining PAPR control
Solution Approach 2:
The system dynamically adjusts modulation parameters and processing gains to compensate for the combined data and tone reservation signal processing, optimizing spectral efficiency through parameter optimization while maintaining the PAPR reduction effect
3Use of energy by moving object
If conventional tone reservation is used, then power consumption is reduced, but throughput decreases
Solution Approach 1:
By merging data modulation and tone reservation signal generation into a single joint process, the system eliminates the need for separate reserved subcarriers, thereby increasing the number of subcarriers available for data transmission and improving throughput while maintaining power efficiency
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a first message indicating a capability of the UE to jointly modulate data with tone reservation signals on an individual subcarrier basis. Accordingly, the UE may receive a second message activating joint modulation of data with tone reservation signals for the UE. In some examples, the UE may also receive control signaling indicating various parameters to use for joint modulation of data with tone reservation signals. The UE may communicate with a base station over multiple subcarriers in accordance with the second message and the control signaling, where one or more of the multiple subcarriers carry data jointly modulated with tone reservation signals on an individual subcarrier basis. The described techniques may enable the UE to perform wireless communications with higher throughput, reduced power consumption, and improved spectral efficiency, among other benefits.