OFDM Uplink Resource Mapping for Low-Collision Spatial Transmit Diversity
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing multiple antennas for improved uplink performance, particularly in LTE and LTE-A equipment, due to limitations in transmit diversity schemes and resource allocation, which can lead to increased collisions and reduced spectral efficiency.
Innovation Solution
Implementing a spatial orthogonal transmit diversity (SORTD) scheme using orthogonal and quasi-orthogonal resource mapping methods to allocate and manage transmit diversity across multiple antennas, ensuring low peak-to-average power ratio and minimizing collisions through intelligent resource allocation and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are used for uplink transmission to improve spectral efficiency and data throughput, then system performance is enhanced, but resource allocation complexity and collision probability increase
Solution Approach 1:
The patent segments the uplink transmission resources by allocating different orthogonal resources (time slots, frequency resources, or code sequences) to different antennas. This segmentation allows each antenna to transmit independently without causing collisions, thereby maintaining high data throughput while managing resource allocation complexity through structured division of resources.
Solution Approach 2:
The patent introduces an additional dimension of orthogonality in resource allocation across multiple antennas. By utilizing orthogonal resources in time, frequency, or code domains, the system can support multiple simultaneous transmissions without interference, effectively increasing data throughput while keeping resource management tractable through dimensional separation.
2Productivity
If multiple antennas are used for uplink transmission to improve spectral efficiency, then system performance is enhanced, but collision probability increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring orthogonal resources for each antenna before transmission begins. The base station allocates specific time slots, frequency resources, or code sequences to each antenna in advance, ensuring that collisions are avoided from the outset. This proactive resource assignment maintains high spectral efficiency while eliminating collision risks.
Solution Approach 2:
The patent uses copying by creating orthogonal copies of transmission resources for each antenna. Each antenna receives a unique orthogonal version of the resource (different time slot, frequency resource, or code sequence), allowing simultaneous transmissions to be distinguished and received without collision, thereby maintaining both spectral efficiency and reliability.
3Reliability
If transmit diversity schemes are implemented to improve uplink performance, then system robustness is enhanced, but implementation complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying resource allocation parameters (time slots, frequency resources, code sequences) to create orthogonal transmission paths for different antennas. This approach achieves transmit diversity and improved uplink performance through parameter variation rather than complex signal processing, thereby enhancing reliability while keeping implementation complexity manageable.
Data Source
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AI summary
The present invention discloses a method at a network element in a wireless communication system. The method comprises transmitting, to a user equipment, a downlink message using orthogonal frequency division multiplexing, OFDM, symbols, wherein the downlink message comprises a first control channel element and a second control channel element. A location of the first control channel element is associated with a first index, and a second index is associated with the first index. An indicator of a first orthogonal resource is associated with the first index, and an indicator of a second orthogonal resource is associated with the second index. The second control channel element is associated with the second orthogonal resource. The method comprises receiving an uplink transmission from the user equipment; despreading the received uplink transmission into a first modulated message using the first orthogonal resource, and, despreading the received uplink transmission into a second modulated message using the second orthogonal resource.