Multi-Collector Receiver for Multiuser Detection
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Solution Overview
Problem
Current multiuser detection (MUD) based multiple access communication systems face challenges in increasing the number of simultaneous users due to heavy interference, as existing receivers are unable to detect and decode information effectively, and algorithms become ill-defined with increasing users, limiting throughput and user capacity.
Innovation Solution
The implementation of multiple collectors at the receiver, allowing for additional measurements and combining signals into a higher-dimensional space for processing, which increases the rank of the signal matrix, enabling more users to be supported by using two or more antennas to collect and time-stamp signals before multiuser detection processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users transmit information simultaneously on the same channel, then throughput of transmitted bits increases, but heavy signal interference degrades reception quality
Solution Approach 1:
The patent introduces a new spatial dimension by employing multiple collectors (antennas) at the receiver. Instead of processing signals from a single receiver point, the system collects signals from multiple spatial locations and combines them to form a higher-dimensional signal representation. This dimensional expansion allows the multiuser detection algorithm to separate interfering signals more effectively, enabling higher throughput while maintaining reception quality despite heavy interference.
2Quantity of substance
If the number of users per channel is increased, then system capacity improves, but co-channel interference limits the number of active users
Solution Approach 1:
The patent resolves this contradiction by transitioning from a single-collector to a multi-collector configuration, thereby adding spatial dimensions to the signal reception. This dimensional enhancement provides the multiuser detection algorithm with additional independent measurements, enabling it to distinguish between more simultaneous users despite their interfering signals occupying the same channel.
3Device complexity
If current state of the art receivers are used, then device complexity is low, but they are not capable of detecting information under heavy interference
Solution Approach 1:
The patent enhances detection capability by incorporating multiple collectors that provide additional spatial dimensions for signal processing. This allows the system to maintain relatively simple receiver architecture while achieving superior detection performance under heavy interference through the increased dimensionality of the received signal vectors.
4Measurement precision
If algorithms are used to separate interfering transmissions, then reception quality improves, but algorithms become ill-defined with increasing number of users
Solution Approach 1:
The patent addresses this contradiction by providing the algorithm with additional spatial dimensions through multiple collectors. This extra dimensional information stabilizes the mathematical operations in multiuser detection algorithms, preventing them from becoming ill-defined even as the number of users increases, thereby maintaining detection accuracy without excessive algorithmic complexity.
Data Source
AI summary
A digital wireless communication system for increasing the number of users capable of communicating over a network permits multiusers to transmit information simultaneously on the same channel of frequency. The primary example of such a system would be that employing radio frequency transmissions, even optical transmissions; however, the invention will also apply to magnectic detections such as in the reading of information stored on a magnetic tape. It is possible to increase overall throughput in terms of total number of bits transmitted through the shared medium by all users of a multiple access system if the signals are allowed to interfere. The present invention provides a multiuser detection process and apparatus that is capable of pulling apart signals in heavy interference in real time by combining the signals received from two or more spatially seperated collectors or antennas. The present invention includes the step of taking more measurements of the received signal from two separate collections prior to definition of the multiuser algorithm parameters and combining the different collection of signals as one signal for multiple user detection processing.