Mobile Transmit Diversity via Hypothesis Feedback
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Solution Overview
Problem
Current multiple-antenna systems, such as MIMO, do not effectively support transmit diversity techniques for mobile devices in high-speed wireless data networks like EVDO, HSPA, EDGE, and LTE, limiting link throughput and communication quality.
Innovation Solution
A method for a remote unit in an EVDO network that sends multiple transmissions corresponding to hypotheses of multiple antenna usage, receives feedback from the base station, and selects a suitable multiple-antenna scheme for data transmission, using steering vectors to optimize antenna selection and beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple-antenna systems (MIMO) are used to enhance data transmission, then link throughput can be increased, but the system complexity and infrastructure requirements increase significantly
Solution Approach 1:
The patent segments the multiple-antenna transmission into separate hypothesis transmissions. The remote unit transmits multiple versions of the same data using different antenna configurations (hypotheses), and the base station evaluates each hypothesis independently. This segmentation allows the system to achieve MIMO throughput benefits while keeping the base station infrastructure relatively simple, as each hypothesis can be processed using existing single-antenna reception capabilities.
Solution Approach 2:
The patent applies preliminary action by having the remote unit pre-compute and transmit multiple hypotheses of antenna usage configurations before actual data transmission. The base station receives these pre-prepared hypotheses and selects the best one based on channel conditions. This preliminary preparation allows the system to adapt to changing channel conditions without requiring complex real-time base station processing.
2Reliability
If transmit diversity techniques are implemented for mobile devices in high-speed wireless networks, then communication quality improves, but compatibility with existing network standards (EVDO, HSPA, EDGE, LTE) becomes challenging
Solution Approach 1:
The patent makes the remote unit universal by enabling it to operate with multiple antenna configurations while maintaining compatibility with existing network standards. The device can transmit multiple hypotheses that are compatible with EVDO, HSPA, EDGE, and LTE standards, allowing it to function in diverse network environments. The base station processes these hypotheses using existing standard-compliant reception, ensuring broad compatibility across different wireless network infrastructures.
3Measurement precision
If the base station is made aware of multiple antenna usage hypotheses, then feedback accuracy improves, but feedback overhead and processing complexity increase
Solution Approach 1:
The patent extracts the multiple antenna hypothesis information from the main data transmission and handles it separately. The remote unit transmits data along with embedded hypothesis information, and the base station extracts and evaluates these hypotheses independently. This extraction approach allows the base station to provide accurate feedback on the best hypothesis without requiring extensive feedback overhead, as the hypothesis selection logic is distributed to the remote unit.
Solution Approach 2:
The patent applies self-service by enabling the remote unit to autonomously evaluate multiple hypotheses and select the best one based on base station feedback. Instead of requiring the base station to process and provide detailed feedback on each hypothesis, the remote unit performs self-evaluation using compact feedback from the base station. This self-service approach reduces feedback overhead while maintaining measurement precision, as the remote unit leverages its own knowledge of transmitted hypotheses to make optimal selections.
Data Source
AI summary
A method for use by a remote unit in an Evolution Data Optimized (EVDO) network includes sending transmissions to a base station, each of the transmissions corresponding to a respective one of multiple hypotheses of multiple antenna usage. The method also includes receiving feedback from the base station in response to the transmissions, the feedback being uninformed of multiple antenna usage and using the feedback to select at least one of the hypotheses. The method further includes transmitting data using a multiple-antenna scheme associated with the selected hypotheses.