Systems and methods for radio frequency calibration exploiting channel reciprocity in distributed input distributed output wireless communications
US-12166546-B2 · Dec 10, 2024 · US
Precoding matrix index selection process for a MIMO receiver based on a near-ML detection, and apparatus for doing the same
US8953702B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8953702-B2 |
| Application number | US-201113995766-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 20, 2011 |
| Priority date | Dec 21, 2010 |
| Publication date | Feb 10, 2015 |
| Grant date | Feb 10, 2015 |
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Abstract
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A process selects a Precoding Matrix Index (PMI) in a Multiple In Multiple Out (MIMO) receiver used in a wireless communications system including a base station communicating with User Equipments (UE) through a downlink and uplink channel. The base station applies a precoding on the transmit symbol vector based on a matrix selected from a set of predefined matrices and identified by a PMI index computed by the UE and forwarded to the base station via the uplink. The process includes estimating the MIMO channel matrix H of a given set of resources blocks comprising received symbol vectors, estimating the variance σ 2 of the additive noise (AWGN), and computing for each particular matrix comprised within the set of predefined matrices a cost function representative of the orthogonality of the matrix MIMO channel matrix H. The process further includes comparing the values of the cost function and transmitting to the base station the index corresponding to the matrix corresponding to the best conditioned MIMO channel matrix according to the comparison of the values.
First claim
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The invention claimed is: 1. A process for selecting a Precoding Matrix Index (PMI) in a Multiple In Multiple Out (MIMO) receiver used in a wireless communications system comprising a base station communicating with User Equipments through a downlink and uplink channel, said base station applying a precoding on a transmit symbol vector based on a matrix W i being selected from a set of predefined matrices and identified by a PMI index computed by said UE and forwarded to said bas…
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- H04B7/0452Primary
Electricity · mapped topic
- H04B7/0456Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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- What does patent US8953702B2 cover?
- A process selects a Precoding Matrix Index (PMI) in a Multiple In Multiple Out (MIMO) receiver used in a wireless communications system including a base station communicating with User Equipments (UE) through a downlink and uplink channel. The base station applies a precoding on the transmit symbol vector based on a matrix selected from a set of predefined matrices and identified by a PMI index…
- Who is the assignee on this patent?
- Aubert Sébastien, Ancora Andrea, St Ericsson Sa
- What technology area does this patent fall under?
- Primary CPC classification H04B7/0452. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 10 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).