Iterative Multi-User Detection for Wireless Interference
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Solution Overview
Problem
In multi-user wireless communication systems, multi-user interference limits bit error performance and cell capacity due to shared time-frequency resources, particularly affecting users in cell edge areas.
Innovation Solution
An iterative multi-user detection method using a frequency domain equalizer is employed to cancel multi-user interference by generating an interference canceled signal and demodulating it using a demodulation process specialized for each user, which includes forward error correction and frequency domain equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users share the same time-frequency resources simultaneously, then system resource utilization is improved, but multi-user interference increases and bit error performance deteriorates
Solution Approach 1:
The patent implements an iterative feedback mechanism where the received signal is initially detected, then the detected signal is used to generate and subtract interference cancellation signals from the original received signal. This process repeats with each iteration, using the improved detection results to create better interference cancellation, thereby progressively reducing multi-user interference and improving bit error performance while maintaining high resource utilization
Solution Approach 2:
The patent introduces an interference cancellation signal as an intermediary element. This cancellation signal is generated based on detected user signals and is used to remove multi-user interference from the received signals. By inserting this intermediary cancellation component, the system enables multiple users to share resources effectively while maintaining reliable detection performance
2Reliability
If frequency domain equalization is used to improve signal quality, then bit error performance is improved, but device complexity increases due to iterative processing
Solution Approach 1:
The patent segments the complex interference cancellation process into distinct functional modules: a detection unit that initially detects user signals, an interference cancellation unit that generates and subtracts cancellation signals, and a signal combination unit that merges the original and canceled signals. This segmentation allows the complex iterative process to be implemented in a structured, manageable way that balances performance improvement with computational complexity
Data Source
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AI summary
A method and apparatus for transmitting and receiving data by performing an iterative multi-user detection is provided. The apparatus includes: a receives a transmission signal and generates a received signal, the transmission signal being generated by modulating a single carrier signal via a modulation process, specialized for each user, in a wireless communication system; an interference canceled signal generator which generates an interference canceled signal by canceling a signal interference using a demodulated signal with respect to the received signal, the signal interference being caused by an other user; and a demodulated signal generator which generates the demodulated signal by demodulating the received signal via a demodulation process using the interference canceled signal, the demodulation process being specialized for each user, wherein the demodulated signal, which is generated by performing the generating of the interference canceled signal and the generating of the demodulated signal at least once, is adopted as a final demodulated signal.