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Patent

Method and apparatus for quasi maximum likelihood MIMO detection

Guangjie Li
TLDR
In this article, techniques for MIMO detection that have performance approaching that of a maximum likelihood (ML) algorithm while having a reduced computational complexity are described, where QR decomposition and maximum likelihood detection may be performed on the 2×2 system.
Abstract: 
Techniques for MIMO detection that has performance approaching that of a maximum likelihood (ML) algorithm while having a reduced computational complexity are described. One method of an embodiment decomposes a MIMO channel into a 2×2 system. QR decomposition and maximum likelihood detection may be performed on the 2×2 system. Thereafter, certain metrics are combined and either a soft demodulation or decision and cancellation follows. Other embodiments are described and claimed.

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Citations
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Detection method and apparatus for a multi-stream mimo

Haifeng Wang, +4 more
TL;DR: In this article, a search-tree based QR decomposition-M (QRD-M) algorithm is used to detect multiple spatial signal streams received from a multiple-input multiple-output (MIMO) channel.
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Method and apparatus for receiving signals in a MIMO system with multiple channel encoders

Jungwon Lee, +1 more
TL;DR: In this paper, a method for decoding plurality of information streams corresponding to a plurality of layers, where the plurality of received streams have been transmitted via a multiple input multiple output (MIMO) communication channel, is presented.
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Wireless circuitry with reduced harmonic interference

Louis Joseph Sanguinetti, +2 more
TL;DR: In this article, the authors proposed a real-time switch configuration for a radio-frequency switch that can be configured in real time to switch a desired communications band into use, such as 2f, 3f, and other integral multiples of the transmitted signals.
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Receiver and receiving method

Markku J. Heikkila, +1 more
TL;DR: In this paper, an apparatus including a detection unit configured to perform nonlinear detection on a receive signal, a first estimator configured to estimate a first quality measure based on the receive signal and a second estimator configurable to estimate another quality measure dependent on the first measure and a performance measure of the detection unit is provided.
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Beam selection in open loop mu-mimo

Guangjie Li, +2 more
TL;DR: In this article, a beam selection method in open-loop MU-MIMO for an asymmetric antenna configuration is proposed, which employs limited feedback, as compared with single-user closed-loop MIMO and multiple-user CLM, in which the base station requires channel state information (CSI).
References
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Patent

Adaptive mimo systems

D. Skraparlis
TL;DR: In this article, an adaptive MIMO communications system with a feedback path from the receiver to the transmitter and a controller responsive to the feedback signal to configure a transmission from the transmitter to the receiver is presented.
Patent

Spherical decoder for wireless communications

Linda M. Davis, +3 more
TL;DR: In this paper, the spherical decoder uses an upper triangular matrix representation of the channel matrix as part of a recursive, cumulative cost function that provides the results of the candidate search.
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Method and apparatus for transmitting/receiving data in a multiple-input multiple-output communication system

Sung-Jin Kim, +7 more
TL;DR: In this paper, a multiple-input multiple-output (MIMO) communication system is provided for communication between a transmission apparatus having a plurality of transmission antennas and a reception apparatus having an additional plurality of reception antennas, where the reception apparatus performs singular value decomposition (SVD) on channel information for a channel established to the transmission apparatus, and feeds back the SVD-decomposed channel information.