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Delayed branch decision in quadrature decomposition with M-searchtng

A technology of orthogonal decomposition and branch, applied in the direction of shaping network, baseband system, digital transmission system, etc. in the transmitter/receiver, which can solve the problem of not achieving the best performance.

Inactive Publication Date: 2010-03-03
NOKIA CORP
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Problems solved by technology

[0003] However, due to multi-antenna interference in the receiver, conventional linear equalizers cannot achieve optimal performance

Method used

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  • Delayed branch decision in quadrature decomposition with M-searchtng
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  • Delayed branch decision in quadrature decomposition with M-searchtng

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Embodiment Construction

[0017] An exemplary embodiment of the present invention, a QRD-M search algorithm with branch delay decision and its complexity and link analysis is disclosed herein. It can be seen that the current preferred scheme can significantly improve the system performance compared to the conventional scheme which keeps the same number of branches (M value) in the search. Using high-order modulation (such as 16QAM) and a relatively larger value of M (such as 8), the improved scheme with M of 4 has approximately the same performance as the conventional scheme with M of 8, but the complexity can be halved.

[0018] The present invention can be implemented in MIMO OFDM type communication such as communication most suitable for MIMO Long Term Evolution (LTE) / WiMAX / ... and the like. There is a sliding window for QRD-M detectors to jointly make final decisions within multiple layers. The invention can be implemented in and implemented by a MIMO receiver.

[0019] A MIMO-OFDM communication ...

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Abstract

A QRD-M decomposition includes a first and a sequential second stage, at least. In the first stage, M branches are selected from among more than M branches entering the first stage as survive branchesfrom which multiple decompositions are calculated. In the second stage, more than M branches are selected from among those branches entering the second stage as survive branches from which multiple decompositions arecalculated. The symbol of the received signal is decided from a branch that is a survive branch of both the first and second stages. The second stage may be within a window that may include additional stages at which the pruning decision down to M survive branches is delayed. One or more windows may be used in a single QRD-M decomposition. In an embodiment, all branches entering the second stage are survive branches. It is shown that the marginal increased computational load increases accuracy.

Description

technical field [0001] The exemplary and non-limiting embodiments of the present invention relate generally to wireless communication systems, and in particular to Orthogonal Decomposition-based M-search signal detection (QRD-M); M is the number of fingers selected in the search. Background technique [0002] Multiple-Input Multiple-Output (MIMO) systems can provide significant performance gains in system capacity over traditional Single-Input Single-Output (SISO) systems; thus MIMO systems can be a preferred solution to support higher data rate transmissions in communications Program. [0003] However, conventional linear equalizers cannot achieve optimal performance due to multi-antenna interference in the receiver. There are many proposals on how to improve signal detection performance in MIMO communication. These proposals include serial interference cancellation and parallel interference cancellation, where Maximum Likelihood Sequence Detection (MLSD) is the optimal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03
CPCH04L2025/03426H04L25/03216
Inventor 李玮王海峰J·O·利尔勒贝格陈明程时昕
Owner NOKIA CORP
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