Space Quadrature Block Code for Mobile Data Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile communication systems, such as 3GPP GERAN, lack a transmit diversity technique that can effectively utilize multiple antennas and carriers for data transmission, particularly when not designed with OFDM in mind, limiting data rate and system throughput.
Innovation Solution
A method and apparatus for data transmission using Space Quadrature Block Code (SQBC) that maps symbols to antennas and domains in the in-phase and quadrature-phase domains, allowing for efficient transmission and reception with two or four antennas and one or two carriers, leveraging OFDM principles for improved diversity and reduced receiver complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit diversity techniques (SFBC/FSTD) are used in OFDM-based systems, then data rate and system throughput are improved, but the system becomes incompatible with non-OFDM systems like 3GPP GERAN
Solution Approach 1:
The patent creates a transmit diversity scheme that works universally across different system types. By formulating the diversity technique in terms of in-phase and quadrature-phase domains rather than OFDM-specific subcarriers, the same mathematical framework can be applied to both OFDM and non-OFDM systems, achieving multi-functionality and broad adaptability.
Solution Approach 2:
The patent transforms the transmit diversity approach by changing the domain parameters from frequency-domain subcarriers (OFDM-specific) to time-domain in-phase and quadrature-phase components. This parameter transformation allows the technique to be adapted to different modulation schemes and system architectures without fundamental redesign.
2Reliability
If SFBC and FSTD are combined for 4-antenna systems, then transmission spatial correlation is improved, but receiver implementation complexity increases
Solution Approach 1:
The patent moves the diversity implementation from the frequency domain (subcarrier dimension) to the time domain (in-phase and quadrature-phase dimensions). This dimensional transformation simplifies the receiver by avoiding complex frequency-domain processing while maintaining the spatial correlation benefits through proper mapping of symbols to antenna ports in the time domain.
Data Source
AI summary
Methods and apparatus are provided for transmitting/receiving data in consideration of carrier frequency in the mobile communication system using multiple transmission antennas for increasing data rate and system throughput. A number of antennas and a plurality of symbols are determined via an in-phase domain and a quadrature-phase domain. The symbols are mapped according to the number of antennas and the in-phase domain and the quadrature-phase domain. The mapped symbols are transmitted through corresponding antennas.