5G NR Uplink Transmit Diversity Precoding
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Solution Overview
Problem
Current uplink transmission solutions in wireless communication networks, particularly in 5G NR systems, do not provide sufficient speed or customization for efficient operation, limiting the performance of multiple-access systems like CDMA, TDMA, FDMA, OFDMA, and SC-FDMA systems.
Innovation Solution
The implementation of various transmit diversity schemes such as antenna switching, space-time block coding, small delay cyclic delay diversity, and precoding within 5G NR systems to enhance uplink transmissions using multiple antennas, improving reception at base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current uplink transmission solutions are used in 5G NR systems, then system operation is maintained, but transmission speed and customization capability are insufficient
Solution Approach 1:
The patent implements dynamic transmit diversity schemes where the system can switch between different transmission modes (antenna switching, space-time block coding, cyclic delay diversity, precoding) based on real-time channel conditions and service requirements. This dynamic adaptation enables both high transmission speed through optimal mode selection and customization capability through flexible configuration of diversity parameters.
Solution Approach 2:
The patent changes key transmission parameters including diversity scheme type, antenna port configuration, cyclic shift values, and precoding matrix indicators dynamically. By adjusting these parameters based on channel quality indicators and service type, the system achieves both high transmission speed and adaptability to different customization requirements.
2Reliability
If multiple antennas are used for uplink transmissions, then reception quality is improved, but system complexity increases
Solution Approach 1:
The patent segments the transmit diversity functionality into distinct, independently selectable schemes (antenna switching, space-time block coding, cyclic delay diversity, precoding). Each scheme can be activated or deactivated based on requirements, allowing the system to achieve high reception quality through multiple antennas while managing complexity by enabling only necessary diversity mechanisms at any given time.
Solution Approach 2:
The patent implements a universal transmit diversity framework that can operate with different numbers of antenna ports (1, 2, or 4 ports) and support multiple diversity schemes within a single system. This multi-functionality allows the system to achieve high reception quality across various configurations without proportionally increasing complexity, as the same base architecture supports diverse operational modes.
3Reliability
If transmit diversity schemes are implemented to spread data across multiple antennas, then communication quality and reliability are improved, but processing overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing precoding matrices and diversity scheme configurations in codebooks. The UE can quickly select from pre-defined options based on channel conditions, significantly reducing real-time processing overhead while maintaining high communication reliability through sophisticated diversity techniques.
Solution Approach 2:
The patent employs lightweight, easily computable diversity schemes such as simple antenna switching and cyclic delay diversity that can be rapidly applied and discarded. These schemes provide reliable communication with minimal processing requirements compared to more complex alternatives, effectively reducing processing overhead while maintaining reliability.
Data Source
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AI summary
A configurable new radio (NR) uplink (UL) transmission may use transmit diversity. A user equipment (UE) may identify an uplink transmission of at least one stream as using one of cyclic prefix orthogonal frequency division multiplexing or discrete Fourier transform spread orthogonal frequency division multiplexing. The UE may apply a precoding matrix to the at least one identified stream. The precoding matrix changes over time. The precoding matrix may change based on closed loop feedback, a precoding cycling pattern, and/or a code division multiplexing group. The UE may transmit the at least one identified stream from multiple antennas according to the applied precoding matrix.