Wireless Transmission Using Spatial Orthogonal Transmit Diversity
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting control information, particularly in LTE and LTE-A systems, due to limitations in spectral efficiency and data throughput, especially when using single-input, multiple-output (SIMO) and multiple-input, multiple-output (MIMO) configurations, which affect the performance of uplink (UL) communication.
Innovation Solution
The implementation of spatial orthogonal transmit diversity (SORTD) and orthogonal resource mapping methods, utilizing multiple antennas for transmit diversity, which involves spreading modulated symbols using orthogonal sequences and combining them for transmission, allowing for improved communication performance while maintaining low peak-to-average power ratio (PAPR).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single antenna is used for UL transmission, then device complexity is reduced, but spectral efficiency and data throughput are limited
Solution Approach 1:
The patent transitions from single-antenna transmission to multi-antenna transmission, adding a spatial dimension to the communication system. By utilizing multiple antennas for transmit diversity, the system achieves improved spectral efficiency and data throughput while maintaining manageable device complexity through structured transmission schemes.
2Productivity
If multiple antennas are used for UL transmission, then spectral efficiency and data throughput are improved, but device complexity increases
Solution Approach 1:
The patent segments the transmission process into distinct components: modulated symbols are spread using orthogonal sequences and transmitted through multiple antennas. This segmentation allows the system to manage multi-antenna complexity by breaking down the transmission into manageable stages, including symbol spreading, orthogonal resource mapping, and structured transmission.
Solution Approach 2:
The patent employs parameter changes by using orthogonal sequences with different lengths and properties for different antennas. By varying the orthogonal resources and spreading sequences, the system achieves improved data throughput while managing complexity through parameter differentiation rather than structural complexity.
3Reliability
If orthogonal sequences are used for spreading, then transmit diversity is achieved, but signal processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining orthogonal sequences and spreading codes that are known to both transmitter and receiver. This allows the receiver to prepare appropriate combining algorithms in advance, reducing real-time signal processing complexity while maintaining transmit diversity benefits.
Data Source
AI summary
Methods, devices, and systems for the transmission of information in a wireless communication system are disclosed. In one embodiment, a method of transmission in a wireless communication system comprises determining by a wireless device (201) a configuration of a plurality of power amplifiers (207) to achieve a single antenna transmission mode; amplifying a signal by said wireless device (201) using the configuration of the plurality of power amplifiers (207) to form a plurality of amplified signals; simultaneously transmitting at or about the same time by the wireless device (201) to a base station (202) the plurality of amplified signals from a plurality of physical antennas (212), wherein the plurality of physical antennas (212) are coupled to the configuration of the plurality of power amplifiers (207); and wherein the measured transmit power from the totality of the plurality of physical antennas (212) is about the same as the required transmit power using the single antenna transmission mode.