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Integer spreading rotation matrices for QAM constellations and its application to decode-remodulate-forward cooperative communication strategy

A rotation matrix, 64-QAM technology, applied in modulation carrier system, digital transmission system, error prevention/detection through diversity reception, etc., can solve problems such as amplifying noise power

Active Publication Date: 2010-08-04
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, AF also amplifies the noise power

Method used

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  • Integer spreading rotation matrices for QAM constellations and its application to decode-remodulate-forward cooperative communication strategy
  • Integer spreading rotation matrices for QAM constellations and its application to decode-remodulate-forward cooperative communication strategy
  • Integer spreading rotation matrices for QAM constellations and its application to decode-remodulate-forward cooperative communication strategy

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Embodiment Construction

[0018] Those of ordinary skill in the art will appreciate that the following description is provided for purposes of illustration and not limitation. A skilled artisan will appreciate that there are many variations within the spirit of the invention and scope of the claims. The current description may omit unnecessary details of well-known functions and constructions in order to facilitate the understanding of the present invention.

[0019] In order to get the 2×2 rotation matrix of QAM symbols, the basic system model is

[0020] y 1 y 2 = h 1 0 0 h 2 ...

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Abstract

Diversity techniques are commonly used in wireless communications to combat multi-path fading. Recent interests in ultra -wideband technology focus on multi-band OFDM systems that can explore the high diversity due to the independent frequency bands. To achieve full diversity with high data rate, a system (800), apparatus (500) and method that uses coded modulation with spreading rotation of transmitted signals. A 2x2 integer rotation matrix for QAM signals, 3x3 and 4x4 integer rotation matrices for QAM signals are provided. Compared with the non -regular QAM shape for real rotation matrices, each of these integer rotation matrices makes the regular QAM shape after rotation. The systematic design of these spreading matrices can be used to simplify the receiver structure such as simplified ML, MMSE and ZF, and then reduce their decoding complexity. Further, the present invention achieves cooperative diversity not only from distributed users but also from the signal space diversity of each user. An embodiment is provided for a cooperative system (100) in which different rows of integer rotation matrices are used by a source and relays as a modulation scheme to increase cooperative diversity.

Description

technical field [0001] The present invention relates to a system, apparatus and method for increasing the diversity of QAM communications by using a specially derived spreading rotation matrix. Applying these extended rotation matrices in a cooperative relay scheme (where relay nodes decode-remodulate-forward (D-ReM-F) transmitted QAM signals) enables additional signal space diversity and cooperation from assigned users separation. Background technique [0002] Diversity is commonly used in wireless communication systems to prevent multipath fading and improve system performance. Recently, interest in ultra-wideband technology has focused on multi-band OFDM systems that use the high diversity caused by multiple independent frequency bands. To achieve full diversity with high data rates, one technique that can be used is coded modulation with spread rotation of the transmitted signal, e.g. dual-carrier proposed in the MBOA PHY specification for 4-QAM signals and rotated DFT...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34H04L1/06
CPCH04B7/0848H04B7/026H04L27/2626H04L27/3405H04B7/15592H04L27/38H04L27/34H04L27/3483
Inventor J·杨M·戈什
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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