Uplink Multiplexing With STBC And OCC For Single-Carrier Waveforms
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Solution Overview
Problem
Current wireless communication systems face challenges in allowing multiple user equipment (UEs) to concurrently transmit uplink communications while maintaining a single-carrier waveform property, which is essential for efficient resource usage and power efficiency.
Innovation Solution
The use of space-time block codes (STBCs) with orthogonal cover codes (OCCs), such as Walsh codes, is applied to configure multiple UEs to transmit concurrently, ensuring that uplink transmissions maintain a single-carrier property by generating distinct STBCs for each UE, which are applied across or within OFDM symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs transmit uplink concurrently using multiple antennas, then network capacity and resource utilization improve, but maintaining single-carrier waveform property becomes difficult
Solution Approach 1:
The patent segments the STBC encoding process by applying different orthogonal cover codes (OCCs) to different UEs' transmissions. Each UE's signal is segmented with a unique OCC pattern, allowing simultaneous transmissions to be distinguished while maintaining individual single-carrier properties. This segmentation enables multiple UEs to transmit concurrently without destroying the single-carrier waveform characteristic of each user's signal.
2Productivity
If multiple UEs are configured to transmit concurrently, then resource utilization improves, but system complexity increases
Solution Approach 1:
The patent changes the parameter of orthogonal cover code assignment dynamically based on the number of active UEs and their transmission requirements. By adjusting OCC parameters (such as code length and pattern) according to system state, the patent enables flexible multiplexing of multiple UEs while keeping the base processing structure simple. This parameter adaptation allows the system to scale from single-UE to multi-UE scenarios without fundamentally changing the transmission framework.
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described that support multiplexing uplink transmissions with transmit diversity with a single carrier waveform. Two or more UEs may be configured to use space time block codes (STBC) for transmissions using multiple uplink antennas. A first UE may be configured to use a first STBC for a first uplink transmission. An orthogonal cover code (OCC), such as a Walsh code, may be applied to the first STBC to generate a second STBC, and a second UE may use the second STBC for a second uplink transmission. The first UE and the second UE may concurrently transmit the first uplink transmission and the second uplink transmission. The first STBC and the second STBC may be applied across multiple OFDM symbols, or may be applied within an OFDM symbol on a modulated symbol level.