NOMA Transmission Power Allocation for Mixed Code Word Lengths
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing delays and interference when multiple terminals transmit signals with different code word lengths and propagation losses using non-orthogonal multiple access, leading to inefficient signal reception and decoding.
Innovation Solution
A transmission control method that adjusts the transmitting power of each terminal based on its code word length and propagation loss to ensure a desired receiving power difference, allowing for efficient interference suppression and cancellation, thereby improving signal reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple terminals transmit signals with different code word lengths using non-orthogonal multiple access, then communication capacity is improved, but delay control becomes difficult and reception quality deteriorates
Solution Approach 1:
The patent changes the power parameter dynamically based on code word length. Terminals with shorter code word lengths are assigned higher transmission powers, while terminals with longer code word lengths use lower powers. This parameter adjustment ensures that all terminals complete their transmissions within the same time frame, achieving both high communication capacity and proper delay control.
2Productivity
If multiple terminals transmit signals with different code word lengths using non-orthogonal multiple access, then communication capacity is improved, but reception quality deteriorates
Solution Approach 1:
The patent adjusts the transmission power parameter based on code word length to maintain reliable reception. By assigning higher powers to terminals with shorter code word lengths and lower powers to terminals with longer code word lengths, the system ensures that all signals arrive at the receiver with comparable quality, enabling effective signal combination and maintaining high reception reliability.
3Reliability
If repetitive transmission is performed for coverage enhancement, then signal to noise ratio is improved, but delay increases
Solution Approach 1:
The patent uses partial repetition where terminals transmit the same signal multiple times, but the number of repetitions and timing are optimized based on code word length. Terminals with shorter code word lengths perform more repetitions with higher power, while terminals with longer code word lengths perform fewer repetitions with lower power. This partial action approach achieves sufficient signal-to-noise ratio improvement without incurring excessive delays.
Data Source
AI summary
Provided is a transmission control method for a plurality of transmitting stations which are connected to a wireless communication partner receiving station by non-orthogonal multiple access, and each of which is capable of transmitting a same signal to the receiving station by repetition for a predetermined number of times at a predetermined cycle, wherein an information processing apparatus executes: acquiring information indicating a code word length for each of the plurality of transmitting stations to use for the repetition; and assigning, to each of the plurality of transmitting stations, transmitting power for ensuring a power difference which is required between transmitting stations, so that the shorter the code word length the higher the receiving power at the receiving station.