Radio Transmission Signal Processing for Reception Quality
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Solution Overview
Problem
Current radio communication systems using single-carrier and multi-carrier schemes face challenges in improving data reception quality, particularly in maintaining low power consumption and efficient frequency usage.
Innovation Solution
The proposed solution involves a transmission method that generates and processes signals using 16QAM and 64QAM modulation schemes, with signal processing steps that include precoding and phase changes, allowing simultaneous transmission of signals from multiple antennas at the same frequency, and a reception method that demodulates these signals to enhance data reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-carrier schemes such as OFDM are used, then frequency-usage efficiency and transmission capacity are improved, but signal processing complexity increases due to requirements for FFT and IFFT operations
Solution Approach 1:
The transmission system segments data into multiple streams that are processed independently through different modulation schemes (16QAM and 64QAM), allowing parallel processing without requiring complex FFT/IFFT operations. This segmentation enables high transmission capacity while maintaining simpler signal processing at each stream.
Solution Approach 2:
The patent transitions from traditional single-carrier or multi-carrier frequency-domain processing to a time-domain approach using independent modulation streams. By changing the processing dimension from frequency-domain (OFDM) to time-domain parallel streams, the system achieves high capacity without the computational overhead of FFT/IFFT.
2Use of energy by moving object
If single-carrier schemes are used, then power consumption is reduced by avoiding FFT and IFFT signal processing, but frequency-usage efficiency and transmission capacity are limited
Solution Approach 1:
The patent merges the advantages of single-carrier schemes (low power consumption) with the capabilities of multi-carrier schemes (high transmission capacity) by combining multiple single-carrier streams with different modulation schemes. This merging allows the system to achieve high capacity through parallel streams without requiring the complex FFT/IFFT processing that causes high power consumption.
3Productivity
If 64QAM modulation is used for higher data rates, then transmission capacity increases, but signal processing complexity and sensitivity to channel conditions increase
Solution Approach 1:
The patent segments the high-rate data transmission into two separate streams: one using 16QAM modulation and another using 64QAM modulation. This segmentation allows the system to achieve high overall data rates while keeping individual stream processing simpler and more robust to channel conditions, avoiding the need for complex processing of a single high-order modulation stream.
Data Source
AI summary
Provided is a transmission method that improves data reception quality in radio transmission using a single-carrier scheme and/or a multi-carrier scheme. The transmission method includes: generating a plurality of first modulated signals and a plurality of second modulated signals from transmission data, the plurality of first modulated signals being signals generated using a 16QAM modulation scheme, and the plurality of second modulated signals being signals generated using uniform constellation 64QAM modulation; generating, from the plurality of first modulated signals and the plurality of second modulated signals, a plurality of first signal-processed signals and a plurality of second signal-processed signals which satisfy a predetermined equation; and changing the predetermined equation when a 64QAM modulation used to generate the plurality of second modulated signals is switched from the uniform constellation 64QAM modulation to a non-uniform constellation 64QAM modulation.