Multi-Antenna Transmitter Grouping Reduces PAPR
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Solution Overview
Problem
Clustered DFT-S-OFDM technologies face a trade-off between high Peak-to-Average Power Ratio (PAPR) and frequency diversity gain, with existing solutions either increasing PAPR or sacrificing frequency diversity.
Innovation Solution
A multi-antenna transmitter method that groups and maps data blocks across antennas and sub-bands in a manner that varies between slots, ensuring each data block is transmitted via multiple antennas and mapped to different sub-bands, thereby reducing PAPR while maintaining frequency diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clustered DFT-S-OFDM divides output into multiple clusters and maps to different sub-bands, then frequency diversity gain is improved, but PAPR increases
Solution Approach 1:
The invention segments the data transmission process by dividing data blocks into multiple groups and assigning each group to different antennas for transmission. This segmentation allows the system to maintain frequency diversity through multi-antenna transmission while controlling PAPR by distributing data across multiple transmission paths rather than concentrating it in single high-power clusters.
Solution Approach 2:
The invention introduces a new dimension to the transmission system by utilizing multiple antennas as an additional spatial dimension. Instead of only frequency-domain clustering, the system adds antenna-domain diversity, mapping different data blocks to different antennas. This dimensional expansion provides frequency diversity gain while managing PAPR through spatial distribution.
2Power
If each transmit antenna corresponds to a cluster of data, then PAPR is reduced, but frequency diversity gain is lost
Solution Approach 1:
The invention merges the benefits of both approaches by combining single-antenna cluster transmission with multi-antenna diversity. Multiple data blocks are transmitted through multiple antennas, and the receiver combines these transmissions to achieve both low PAPR (through distributed transmission) and frequency diversity gain (through multi-path reception and combining).
Solution Approach 2:
The invention introduces the antenna as an intermediary element between the data source and the channel. By using multiple antennas as intermediaries to transmit different data blocks, the system achieves spatial diversity that compensates for the loss of traditional frequency diversity, while the distributed nature of multi-antenna transmission keeps PAPR under control.
3Reliability
If data blocks are mapped to different sub-bands across multiple antennas, then frequency diversity is maintained, but system complexity increases
Solution Approach 1:
The invention introduces dynamic behavior to the mapping process, where the mapping of data blocks to antennas and sub-bands varies between slots. This dynamic mapping adapts to channel conditions and traffic patterns, providing frequency diversity when needed while managing complexity through structured, repeatable patterns that can be efficiently implemented.
Solution Approach 2:
The invention changes key parameters of the transmission system, including the mapping relationship between data blocks and antennas, and between antennas and sub-bands. By varying these parameters dynamically, the system optimizes frequency diversity gain while managing complexity through parameter-based control rather than structural complexity.
Data Source
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AI summary
According to one aspect of the present invention, a multi-antenna transmitter is provided. The transmitter includes: a data block acquiring device for acquiring multiple data streams, wherein each data stream includes data blocks at multiple slots; and a grouping and mapping device for grouping and mapping each data block, wherein the data blocks at the same slot in each data stream are grouped according to the number of the antennas and each group is mapped to one of the antennas respectively, and the different data blocks in the same group are mapped to different sub-bands respectively; and wherein grouping and mapping manners which are not exactly the same are adopted for the data blocks at different slots, and the grouping and mapping manners include data block grouping manners, group-to-antenna mapping manners, and sub-band mapping manners. And the groups of data blocks at the multiple slots are transmitted via the antennas. With the technical solutions of the present invention, a reduced PAPR during data transmission can be achieved while the diversity gain is guaranteed.