Random-Access Symbol Vector Encoding Without Channel State Information
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Solution Overview
Problem
Conventional random-access communication methods suffer from inefficient waveform design and inadequate communication reliability due to the need for additional parameters like pilot parts and sparsity, leading to increased complexity and decoding errors.
Innovation Solution
A transmitting device uses a low-complexity binary encoder to construct a symbol vector through a Kronecker product of vectors corresponding to sub-constellations, transmitted over a radio frequency signal without a preassigned time slot or frequency, and a receiving device employs a non-coherent equalizer to estimate and decode these vectors without channel state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal transmits a random access preamble in a cell, then the terminal can establish initial connection, but other cells cannot detect this preamble due to the cell-specific reference signal configuration
Solution Approach 1:
The reference signal is segmented into cell-specific reference signals for data transmission and common reference signals for random access detection. The common reference signal is specifically designed to be detectable by multiple cells, while the cell-specific reference signal maintains dedicated communication capabilities. This segmentation resolves the contradiction by assigning different functions to different signal components.
Solution Approach 2:
The common reference signal serves multiple functions: it enables random access preamble detection across different cells and provides a basis for determining cell-specific reference signal sequences. This multi-functionality allows the system to maintain both inter-cell compatibility and reliable random access detection simultaneously.
2Productivity
If cell-specific reference signals are used for data transmission, then data communication efficiency is improved, but random access detection in neighboring cells becomes difficult
Solution Approach 1:
The reference signal resource is divided into two distinct parts: cell-specific reference signals for efficient data transmission and common reference signals for reliable random access detection. This segmentation allows each signal type to be optimized for its specific function without interfering with the other, resolving the contradiction between data transmission efficiency and random access detection reliability.
Solution Approach 2:
Different reference signal qualities are applied to different functions: cell-specific reference signals with higher specificity for data transmission, and common reference signals with broader detectability for random access. This local quality differentiation ensures that each function receives the appropriate signal characteristics, resolving the contradiction between specialized data transmission and general random access detection.
3Reliability
If different reference signals are used for data transmission in different cells, then data transmission reliability is improved, but random access communication between cells becomes difficult
Solution Approach 1:
The reference signal system is segmented into cell-specific components for reliable data transmission and common components for ease of inter-cell random access. The common reference signal provides a unified detection basis across cells, while cell-specific signals maintain transmission reliability, resolving the contradiction between data reliability and random access ease.
Solution Approach 2:
The common reference signal serves as a universal detection signal across multiple cells, enabling easy inter-cell random access while the cell-specific reference signals maintain data transmission reliability. This multi-functional design resolves the contradiction by providing both universal access capability and specialized transmission reliability.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
A transmitting device for a random-access communication, includes an encoder that acquires an input message having a sequence of bits. The encoder is configured to form a plurality of blocks from the sequence of bits, and determine a plurality of vectors for the plurality of blocks. The transmitting device further includes a mapper circuit that is configured to construct a symbol vector based on the plurality of vectors. The transmitting device further includes an antenna that is configured to transmit the constructed symbol vector over a radio frequency (RF) signal to a receiving device, where the constructed symbol vector represents a symbol modulated in the radio frequency signal.