SFBC Relay System for Transmit Diversity in Compact Terminals
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Solution Overview
Problem
Current wireless Internet services face challenges in providing high-speed data transmission rates, particularly in mobile terminals, where equipping multiple antennas to achieve transmit diversity is difficult due to size constraints and the need for antennas to be spaced far apart, leading to complexity and reduced compactness.
Innovation Solution
A space frequency block code signal processing system and method that uses a relay system to generate and transmit relay signals encoded in a Space Frequency Block Code (SFBC) scheme, allowing for a reduced number of antennas in the source station while achieving transmit diversity, by processing signals in the time domain and utilizing Discrete Fourier Transform (DFT) for efficient signal encoding and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are equipped in the transmitter to achieve transmit diversity, then the reliability is improved, but the device complexity and volume increase
Solution Approach 1:
The patent introduces a relay station as an intermediary between the mobile terminal and the base station. The relay station performs SFBC encoding and transmits relayed signals, enabling transmit diversity without requiring the mobile terminal to have multiple antennas. This mediator approach allows the mobile terminal to maintain compact size while still achieving diversity gains through the relayed transmission path.
2Reliability
If multiple antennas are spaced apart by a large distance to realize TX diversity, then the reliability is improved, but the area occupied increases
Solution Approach 1:
The relay station serves as a mediator that performs the SFBC encoding function centrally. Instead of requiring multiple antennas to be physically spaced apart in the mobile terminal, the relay station handles the diversity encoding and transmission, allowing antennas to be closely spaced or even single-antenna configurations in the mobile terminal while maintaining diversity performance.
Solution Approach 2:
The patent transitions the diversity implementation from the spatial dimension (multiple physically separated antennas) to the signal processing dimension (SFBC encoding in the relay station). By moving the diversity function to the signal processing domain rather than relying purely on physical antenna separation, the system achieves transmit diversity without requiring large spatial separation between antennas.
3Manufacturing precision
If SFBC encoding is performed in the frequency domain, then the manufacturing precision is improved, but the productivity decreases
Solution Approach 1:
The patent replaces complex frequency domain processing operations with simpler time domain operations. Specifically, SFBC encoding that would traditionally require FFT-based frequency domain processing is implemented using time domain signal manipulation, reducing computational complexity and processing time while maintaining encoding accuracy.
Solution Approach 2:
The patent changes the domain parameter from frequency domain to time domain for SFBC encoding operations. This parameter change transforms the encoding process into operations that can be performed more efficiently in the time domain, reducing the number of computational operations required while preserving the integrity and accuracy of the SFBC encoding.
Data Source
AI summary
A space frequency block code signal relaying system is provided. The space frequency block code signal relaying system includes a signal detecting unit which receives, via a radio channel, a source signal sent from a source station and detects the received signal; a relay signal generation unit which generates a relay signal corresponding with the source signal transmitted from the source station to a destination node based on the received signal, the source signal and the relay signal being signals encoded in a Space Frequency Block Code (SFBC) scheme; and a signal transmitting unit which transmits the relay signal to the destination node.