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Method and apparatus for interference mitigation in a baseband OFDM receiver

A receiver, interference compensation technology, applied to the input of the decoder, the field of MIMO OFDM receivers

Inactive Publication Date: 2011-04-27
INTEL MOBILE COMM TECH DRESDEN
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  • Description
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Problems solved by technology

This work cannot be compared directly to linear MMSE equalization without decision feedback

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  • Method and apparatus for interference mitigation in a baseband OFDM receiver
  • Method and apparatus for interference mitigation in a baseband OFDM receiver
  • Method and apparatus for interference mitigation in a baseband OFDM receiver

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Embodiment Construction

[0032] figure 1 A simplified schematic block diagram of a part of a baseband receiver for MIMO OFDM is shown, in which the combined equalization and conditioning proposed according to the present invention can be implemented.

[0033] The fast Fourier transform unit 10 converts time-domain signals from a plurality of receiving antennas into a frequency domain. For each subcarrier, the vector y of the received frequency domain symbols can be expressed as follows (note that all the following vector variables are column vectors):

[0034] y=n+H x (1).

[0035] in:

[0036] x is random, with zero mean, with variance A vector of transmitted symbols of mutually unrelated items of ;

[0037] H is a complex channel matrix having a size of m×1, 1 is the number of transmission layers, and m is the number of receiving antennas and m≥1; and

[0038] n is including mean zero, with variance A complex Gaussian noise vector of mutually uncorrelated items.

[0039] The transmission mo...

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Abstract

A method of compensating interference of received symbols in a MIMO OFDM receiver employs MMSE equalization and LLR scaling, and a MIMO OFDM receiver includes a linear MMSE equalizer. The method provides a low-complexity, numerically robust method for compensating interference of received symbols and provides a low-cost, robust digital baseband receiver for MIMO-OFDM, achieved by merging linear MMSE equalization and scaling of the corresponding equalized symbols into a single algorithm that, for the 2M MIMO case, completely avoids computationally extensive matrix inversion and allows for significant simplification of symbol detection as compared to separate equalization and scaling.

Description

technical field [0001] The present invention relates to a method of compensating for interference of received symbols in a Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) receiver, and in particular to a method comprising applying Minimum Mean Square Error (MMSE) equalization to the received symbols technique and method of log-likelihood ratio (LLR) adjustment technique to obtain equalized and adjusted symbols as input to a decoder of an OFDM receiver. The invention also relates to a MIMO OFDM receiver comprising a linear MMSE equalizer. Background technique [0002] 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) is the standard for the upcoming fourth generation of radio access networks. It uses Orthogonal Frequency Division Multiplexing (OFDM) as the downlink modulation scheme. The mandatory requirement of multiple transmit antennas at the base station side and multiple receive antennas at the mobile terminal sid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
CPCH04L2025/03426H04L25/067H04L25/0204H04L25/03159H04L2025/03522H04L2025/0342H04L2025/03414H04L25/0242H04L27/38
Inventor 安德烈亚斯·布里
Owner INTEL MOBILE COMM TECH DRESDEN
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