Antenna Transmit Diversity with Bandwidth Segmentation
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Solution Overview
Problem
Wireless communication systems face challenges with signal fading due to multipath fading, leading to errors and communication link failures, and existing transmit diversity techniques require multiple antenna subsystems, increasing costs and complexity.
Innovation Solution
Implementing a method that combines antenna transmit diversity with radio bandwidth segmentation, using overlapping transmission patterns and assigning non-overlapping frequency or time segments to antennas to reduce interference and enhance system capacity, while reducing the number of antenna subsystems through spatial interleaving and hybrid transmit diversity techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antenna subsystems are used to implement transmit diversity, then signal fading is mitigated and communication reliability is improved, but device complexity and equipment cost increase
Solution Approach 1:
The patent segments the available frequency spectrum into multiple non-overlapping frequency segments and assigns each antenna to transmit on a specific frequency segment. This segmentation allows the system to achieve transmit diversity without requiring multiple antenna subsystems for each frequency, thereby reducing device complexity while maintaining communication reliability through frequency diversity.
Solution Approach 2:
The patent introduces frequency dimension segmentation as an additional degree of freedom beyond the spatial dimension. By dividing the frequency spectrum and assigning different segments to different antennas, the system achieves diversity gain in the frequency domain, complementing the spatial diversity provided by multiple antennas, thus improving reliability without proportionally increasing device complexity.
2Reliability
If multiple antenna subsystems are used to implement transmit diversity, then signal fading is mitigated, but equipment cost increases
Solution Approach 1:
The patent makes each antenna subsystem multi-functional by enabling it to transmit on multiple non-overlapping frequency segments at different time periods. This universality allows a smaller number of antenna subsystems to achieve the diversity effect that would otherwise require more antennas, thereby reducing equipment cost while maintaining signal fading mitigation capability.
Solution Approach 2:
The patent implements periodic switching of frequency segment assignments among antenna subsystems. Each antenna transmits on different frequency segments at different time periods, creating a periodic pattern that achieves frequency diversity over time. This periodic action allows the system to obtain diversity gain without requiring simultaneous operation of multiple antenna subsystems on all frequency segments, reducing equipment cost.
3Productivity
If bandwidth is segmented into different segments for different cells and sectors, then interference is reduced and system capacity is increased, but device complexity increases
Solution Approach 1:
The patent segments the total bandwidth into multiple non-overlapping frequency segments and assigns each segment to specific antennas and time periods. This segmentation enables multiple cells and sectors to operate simultaneously on different frequency segments, reducing inter-cell and inter-sector interference while increasing overall system capacity. The structured segmentation approach manages device complexity through systematic resource allocation.
Solution Approach 2:
The patent implements dynamic frequency segment assignment where the mapping between antennas and frequency segments changes over time periods. This dynamic allocation allows the system to adaptively manage interference and optimize capacity by assigning different frequency segments to different antennas at different times, increasing system capacity while managing device complexity through flexible resource management.
Data Source
AI summary
Wireless communication techniques for cellular deployment of wireless communication systems with transmitters in each cell to have partially overlapped transmission patterns between two adjacent transmitters. Implementations of the described techniques can provide transmit diversity with intentional partial beam pattern overlays to improve cell sectorization or frequency re-use factor, at the same time, reduce intra-cell and inter-cell interference. Various modulations may be used in the described systems, including FDMA, TDMA, and OFDMA modulation schemes.