IDMA-FBMC Hybrid Wireless System Interference Management
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Solution Overview
Problem
Hybrid multiple access (HMA) technology faces challenges in efficiently managing interference and improving system capacity in wireless communication systems, particularly due to complex iterative interference cancellation methods in interleave division multiple access (IDMA) and limitations in existing multiple access technologies like FDMA, OFDMA, and CDMA.
Innovation Solution
Combining interleave division multiple access (IDMA) with filter bank multi-carrier (FBMC) technology to create a hybrid division multiple access system, which uses independent interleavers and filter banks to transmit data in parallel on pre-selected sub-carriers, enhancing system capacity and resistance to external frequency offset interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hybrid multiple access technology is used to improve system capacity and anti-interference ability, then system performance is improved, but device complexity increases due to the layered structure combining multiple access technologies
Solution Approach 1:
The patent combines interleave division multiple access (IDMA) and filter bank multi-carrier (FBMC) technologies into a unified hybrid multiple access system. The IDMA component provides user separation through interleaving while FBMC provides efficient frequency-domain filtering and subcarrier allocation. This merging allows the system to achieve high anti-interference ability through iterative interference cancellation while maintaining structured complexity through modular architecture design.
2Object-affected harmful factors
If iterative interference cancellation methods are used in IDMA to reduce interference, then anti-interference ability is improved, but processing complexity and computation time increase
Solution Approach 1:
The patent implements iterative interference cancellation where the receiver estimates interference from other users' signals and subtracts it from the received signal in successive iterations. The soft information estimator calculates extrinsic information based on prior statistical information and received data, then updates the interference estimate for the next iteration. This feedback mechanism progressively reduces interference while the iteration control unit manages the number of iterations to balance performance and complexity.
Solution Approach 2:
The patent performs preliminary interference estimation and subtraction before final detection. The soft information estimator uses prior statistical information about code chips to pre-process the received signal and generate initial interference estimates. This preliminary action reduces the burden on subsequent processing stages and improves convergence speed of the iterative algorithm.
3Productivity
If filter bank multi-carrier technology is used to transmit data in parallel on pre-selected sub-carriers, then system capacity is improved, but frequency offset sensitivity increases
Solution Approach 1:
The patent changes the frequency domain parameters by using filter bank multi-carrier modulation with carefully designed filter characteristics. The filter bank provides selective frequency domain filtering that concentrates signal energy on pre-selected sub-carriers while suppressing adjacent frequencies. This parameter optimization in the frequency domain enables parallel data transmission on multiple sub-carriers while the filter design provides inherent resistance to frequency offset through spectral confinement.
Data Source
AI summary
Provided are an apparatus and method for a sending end and a receiving end of a wireless communication system, and a soft information estimator. The apparatus for the sending end of the wireless communication system comprises: an interleave division multiple access unit configured to perform interleave processing on information to be sent; and a filter bank multi-carrier unit configured to use a specific sub-carrier chosen in advance to transmit the interleaved information in a parallel manner.