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 need for extensive feedback between user equipment and base stations in MIMO systems, particularly in systems like E-UTRA, where multiple transmit and receive antennas require frequent channel quality indicator (CQI) and pre-coder selection feedback for each resource block.
Innovation Solution
The solution involves a receiver and transmitter system that groups frequency-domain resource blocks to select a pre-coder that remains optimal across multiple blocks, reducing feedback overhead by encoding pre-coder selection and CQI jointly and applying it to contiguous or combined resource blocks, thereby minimizing the number of feedback bits required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pre-coder selection feedback is provided for each resource block individually, then channel quality optimization is improved, but feedback overhead increases significantly
Solution Approach 1:
The patent groups multiple frequency-domain resource blocks together and selects a single pre-coder for each group rather than individually for each resource block. This merging approach reduces feedback overhead by combining multiple resource blocks into larger groups, allowing one pre-coder selection to serve multiple resource blocks while still maintaining acceptable channel quality optimization.
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 fine-grained optimization (smaller groups) and reduced overhead (larger groups) by adjusting the group size according to channel conditions and system requirements.
2Quantity of substance
If joint encoding of pre-coder selection and CQI is applied, then feedback compression is improved, but encoding complexity increases
Solution Approach 1:
The patent jointly encodes the pre-coder selection and channel quality indicator (CQI) feedback into a single compressed feedback message. This merging of encoding processes allows both pieces of information to be transmitted together with reduced total feedback bits, as the encoder can exploit correlations between pre-coder selection and CQI to achieve more efficient representation.
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.