Pre-coder Selection via Resource Block Grouping
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Solution Overview
Problem
Current wireless communication systems face high operational overhead due to the extensive feedback required between user equipment and base stations in MIMO systems, particularly in OFDM or OFDMA systems, where multiple transmit and receive antennas necessitate frequent channel quality indicator (CQI) and pre-coder feedback for each resource block, leading to increased data transmission and processing burdens.
Innovation Solution
The solution involves a receiver and transmitter system that groups frequency-domain resource blocks to select a pre-coder based on channel estimates, allowing for a single pre-coder selection per group of resource blocks, which reduces feedback overhead by jointly encoding pre-coder and CQI information for efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-coder selection is performed for each resource block individually, then transmission quality is optimized, but feedback overhead increases significantly
Solution Approach 1:
The patent groups multiple frequency-domain resource blocks together and selects a single pre-coder for the entire group rather than individually for each resource block. This merging approach reduces the number of pre-coder selections from one per resource block to one per group, significantly reducing feedback overhead while maintaining acceptable transmission quality across all resource blocks in the group.
Solution Approach 2:
The patent segments the frequency-domain resource blocks into multiple groups, where each group is assigned a pre-coder. This segmentation allows the system to balance between optimization granularity and feedback overhead by controlling the size and composition of each group, achieving a practical compromise between transmission quality and feedback efficiency.
2Productivity
If multiple pre-coders are selected for different resource blocks, then data throughput is optimized, but device complexity increases
Solution Approach 1:
By merging multiple resource blocks into groups and applying a single pre-coder per group, the patent reduces the total number of pre-coders that need to be selected, tracked, and managed. This reduces device complexity in both the user equipment and base station while maintaining reasonable throughput by preserving group-level optimization.
3Measurement precision
If frequent channel quality indicator feedback is provided for each resource block, then channel estimation accuracy is improved, but use of energy increases
Solution Approach 1:
The patent reduces energy consumption by merging the channel quality assessment across multiple resource blocks into a single pre-coder selection per group. This reduces the frequency and volume of feedback transmissions required, thereby reducing the energy consumed by both uplink feedback transmission and downlink processing operations.
Data Source
AI summary
The present invention provides a receiver. In one embodiment, the receiver includes a receive portion employing transmission signals from a transmitter having multiple antennas and capable of providing channel estimates. The receiver also includes a feedback generator portion configured to provide to the transmitter a pre-coder selection for data transmission that is based on the channel estimates, wherein the pre-coder selection corresponds to a grouping of frequency-domain resource blocks. The present invention also provides a transmitter having multiple antennas. In one embodiment, the transmitter includes a transmit portion coupled to the multiple antennas and capable of applying pre-coding to a data transmission for a receiver. The transmitter also includes a feedback decoding portion configured to decode a pre-coder selection for the data transmission that is fed back from the receiver, wherein the pre-coder selection corresponds to a grouping of frequency-domain resource blocks.