Precoded Multi-Antenna ASK Signaling for Fading-Resistant Wake-Up Links
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Solution Overview
Problem
Current wireless communication technologies face challenges in reducing energy consumption, particularly in IoT devices, due to high energy consumption during idle mode listening, and are prone to fading issues in wireless signal transmission, which affects the sensitivity and range of wake-up radios.
Innovation Solution
The use of multi-layered transmission over a plurality of transmit antennas with different precoding for respective layers, employing Manchester coding and antenna selection diversity, allows for efficient transmission of amplitude shift keyed signals, reducing power consumption and improving link performance by exploiting channel variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If OOK modulation is used for wake-up signals to reduce receiver power consumption, then energy efficiency is improved, but the system becomes more susceptible to fading and has limited coverage range
Solution Approach 1:
The wake-up signal transmission is segmented across multiple antennas, with each antenna transmitting a separate layer of the signal. This segmentation allows the receiver to combine signals from multiple paths, improving reliability in fading conditions while maintaining low power consumption operation
Solution Approach 2:
The patent transitions from single-antenna transmission to multi-antenna spatial dimension, adding spatial diversity to the OOK modulation system. This dimensional expansion enables the system to overcome fading limitations without increasing receiver complexity or power consumption
2Reliability
If multi-antenna transmission is used to improve coverage and reliability, then link performance is improved, but device complexity increases
Solution Approach 1:
The transmission is divided into multiple independent layers, each handled by a separate antenna with simple precoding. This segmentation allows complex multi-antenna functionality to be achieved through multiple simple parallel channels rather than a single complex system
Solution Approach 2:
The patent applies simple precoding transformations to the signal before transmission across multiple antennas. These parameter changes in the signal structure enable the system to exploit spatial diversity while keeping the processing complexity at each antenna minimal
3Use of energy by moving object
If wake-up radio is activated only during communication demands to reduce energy consumption, then energy efficiency is improved, but the system becomes more vulnerable to signal fading and has reduced effective range
Solution Approach 1:
By adding spatial dimension through multiple transmit antennas, the system extends its effective coverage area without requiring the receiver to consume more power. The spatial diversity provides multiple paths for the signal to reach the receiver, expanding the reliable coverage range
Data Source
AI summary
A method of transmitting an amplitude shift keyed signal uses a multi-layered transmission over a plurality of transmit antennas with different precoding of different symbols for the respective layers. The method comprises obtaining a sequence of bits to be conveyed, keying the sequence of bits to a signal, precoding the signal to respective layer, and transmitting the precoded signal. A transmitter for transmitting the amplitude shift keyed signal, and a computer program for implementing the method are also disclosed.