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Mimo minimum mean square error receiver using QR decomposition and systolic arrays

A minimum mean square error, array technology, applied in the field of communication, can solve the problem of destroying the symbols of the receiving antenna

Active Publication Date: 2015-05-20
XILINX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Interference from noise and reflections can corrupt symbols received by the receive antenna

Method used

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  • Mimo minimum mean square error receiver using QR decomposition and systolic arrays
  • Mimo minimum mean square error receiver using QR decomposition and systolic arrays
  • Mimo minimum mean square error receiver using QR decomposition and systolic arrays

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Embodiment Construction

[0040] In a multiple-input multiple-output (MIMO) system, multiple (M) transmit antennas transmit corresponding symbols in parallel to multiple (N) receive antennas. Each of the receive antennas receives a weighted sum of the corresponding symbols transmitted from the transmit antennas. Various algorithms exist to decode or separate the symbols transmitted by each transmit antenna. In decode calculations, systolic arrays can be used to increase streaming throughput. A systolic array is an interconnected matrix of individual signal processing units, where the units process individual elements of the input matrix and exchange the processed outputs to perform the overall operation. However, in the context of MIMO decoding using current algorithms, systolic arrays are subject to dependencies between sequential stream inputs - the processing of one element depends on the computed value of a previously processed element. Therefore, an input element cannot be processed until the pr...

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Abstract

A first systolic array receives an input set of time division multiplexed matrices from a plurality of channel matrices. In a first mode, the first systolic array performs triangularization on the input matrices, producing a first set of matrices, and in a second mode performs back-substitution on the first set, producing a second set of matrices. In a first mode, a second systolic array performs left multiplication on the second set of matrices with the input set of matrices, producing a third set of matrices. In a second mode, the second systolic array performs cross diagonal transposition on the third set of matrices, producing a fourth set of matrices, and performs right multiplication on the second set of matrices with the fourth set of matrices. The first systolic array switches from the first mode to the second mode after the triangularization, and the second systolic array switches from the first mode to the second mode after the left multiplication.

Description

technical field [0001] The present invention generally relates to communication from multiple output antennas to multiple input antennas (MIMO). Background technique [0002] Data may be transmitted electromagnetically between a transmit antenna and a receive antenna. The transmitter encodes data into a sequence of symbols selected from a constellation of symbols. A transmit antenna transmits symbols and a receive antenna detects the symbols. [0003] Interference from noise and reflections can corrupt symbols received by the receive antenna. For a maximum likelihood detector, the receiver can compare the received signal to the expected received signal for all symbols in the constellation. The expected received signal that most closely matches the actual received signal provides the detected symbol. [0004] Measurement of the characteristics of the communication medium facilitates proper symbol detection. In one example, a transmitter periodically transmits a known pat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02G06F15/80G06F17/16
CPCG06F17/16H04B7/0413H04B7/0854H04L25/0244H04L27/01H04L27/26G06F7/78G06F15/8046
Inventor 瑞德·N·马萨睿谭海若瑞哈温达·M·瑞欧
Owner XILINX INC