IDMA Receiver Interleaver Power Allocation
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Solution Overview
Problem
Existing cooperative diversity schemes face challenges in maintaining frequency efficiency, reducing complexity, and allowing terminals to freely participate in networks, especially in dynamic wireless communication environments where relay terminals frequently move and participate or exit the network.
Innovation Solution
The implementation of an interleave division multiple access (IDMA) system, which uses unique interleave patterns to differentiate users and employs a power allocation algorithm to reduce bit error rates, thereby improving performance and spectral efficiency while minimizing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonal channels are used to divide frequency bands for relay terminals, then interference between relay terminals is eliminated, but spectral efficiency is reduced due to increased channel usage
Solution Approach 1:
The system segments the signal processing function by separating the interleaving operation at relay terminals from the decoding operation at the base station. Each relay terminal applies a unique interleaver to its received signal before retransmission, allowing multiple relay terminals to share the same frequency band without orthogonal channel division, thus eliminating the spectral efficiency penalty while maintaining interference elimination through the interleaver-based separation.
2Productivity
If orthogonal codes are used for relay terminals to simultaneously transmit signals, then spectral efficiency is maintained, but relay terminal complexity increases due to signal restoration and re-encoding requirements
Solution Approach 1:
The invention extracts the complex decoding and re-encoding operations from the relay terminals and relocates them to the base station. Relay terminals only perform simple interleaving operations on received signals, which is computationally lightweight. The base station performs the computationally intensive deinterleaving and decoding operations, thereby maintaining spectral efficiency through simultaneous relay transmissions while dramatically reducing relay terminal complexity.
3Reliability
If determined channel codes are used for relay terminals, then signal transmission reliability is improved, but network adaptability is reduced when relay terminal configuration changes due to movement
Solution Approach 1:
The system implements dynamic adaptability by allowing relay terminals to freely enter and exit the network without reconfiguration. Each relay terminal uses a unique, pre-assigned interleaver pattern that remains valid regardless of network topology changes. When relay terminals move or the network configuration changes, the base station simply processes the incoming signals from the current set of active relays using their known interleaver patterns, eliminating the need for re-encoding or reconfiguration and maintaining both reliability and adaptability.
4Reliability
If a fixed number of relay terminals are required for determined codes, then coding reliability is maintained, but network flexibility is restricted due to frequency movement and terminal participation changes
Solution Approach 1:
The interleaver-based approach provides universal applicability across varying network conditions and relay terminal counts. The system is designed to handle any number of active relay terminals without requiring a fixed configuration. Each relay terminal's unique interleaver pattern allows the base station to process signals from any subset of relays, enabling the system to adapt to frequency movements, terminal failures, or dynamic network topology changes while maintaining coding reliability through the mathematical properties of the interleavers.
Data Source
AI summary
Disclosed is a receiver in a cooperative diversity system including one or a plurality of relays. The receiver includes: a detection unit configured to detect each of signals transmitted from the one or more relays, the one or more signals being generated by the one or more relays and by interleaving a signal from a transmitter; a deinterleaver configured to deinterleave each of the detected signals; a decoder configured to decode and each of the deinterleaved signals thereby to output one or more decoded signals; and an interleaver configured to interleave each of the one or more decoded signals thereby to output one or more interleaved signals, wherein the detection unit receives the one or more interleaved signals and compares them with the respective detected signals to discriminate the original signal transmitted by the transmitter.