Spatial Orthogonal Transmit Diversity for LTE Control Information
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting control information using existing transmit diversity schemes, particularly in LTE and LTE-A systems, due to limitations in spectral efficiency and peak-to-average power ratio (PAPR), which affect the performance and reliability of uplink communication.
Innovation Solution
The implementation of a spatial orthogonal transmit diversity (SORTD) scheme using multiple antennas and orthogonal resource mapping methods, including the use of reserved control channel elements (CCEs) and quasi-orthogonal resources, to enhance the transmission of control information while maintaining low PAPR and improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional transmit diversity schemes are used in LTE systems, then reliability of control information transmission is improved, but spectral efficiency deteriorates
Solution Approach 1:
The control information is segmented into multiple parts and transmitted through different antenna ports using separate orthogonal resources. Each antenna port transmits a portion of the control information, allowing the system to maintain reliability through diversity while improving spectral efficiency by parallel transmission.
Solution Approach 2:
The patent introduces spatial dimension by utilizing multiple antenna ports (vertical dimension) in addition to the existing time-frequency resources (horizontal dimension). This multi-dimensional approach allows control information to be transmitted through multiple spatial paths simultaneously, improving both reliability and spectral efficiency.
2Productivity
If multiple antennas are used for uplink transmission in LTE, then spectral efficiency is improved, but peak-to-average power ratio increases
Solution Approach 1:
Different antenna ports transmit control information with locally optimized power characteristics. Each antenna port uses orthogonal resources that are specifically designed to maintain low PAPR for that particular transmission path, allowing the system to achieve high spectral efficiency without compromising power efficiency.
Solution Approach 2:
The patent employs periodic transmission patterns where control information is sent in alternating time slots through different antenna ports. This periodic action allows each antenna to transmit at lower peak powers while maintaining overall high spectral efficiency through the coordinated periodic transmissions.
3Reliability
If orthogonal resource mapping is used for multiple antenna ports, then reliability of control information transmission is improved, but device complexity increases
Solution Approach 1:
The orthogonal resource mapping between antenna ports is pre-configured and predetermined. The mapping relationships are established in advance through standard protocols, eliminating the need for complex real-time calculations during transmission. This preliminary setup maintains high reliability while minimizing device complexity.
Solution Approach 2:
Each antenna port automatically determines its orthogonal resources based on pre-defined rules and its own identification. The system self-organizes the resource allocation without requiring complex centralized coordination, thereby improving reliability through consistent resource separation while reducing overall device complexity.
Data Source
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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.