Methods for supporting MIMO transmission in OFDM applications

A wireless terminal, regional technology, applied in transmission systems, digital transmission systems, radio transmission systems, etc., can solve the problem of not processing combined MIMO and so on

Active Publication Date: 2007-05-16
APPLE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Methods for supporting MIMO transmission in OFDM applications
  • Methods for supporting MIMO transmission in OFDM applications
  • Methods for supporting MIMO transmission in OFDM applications

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Embodiment Construction

[0030] According to an embodiment of the present invention, MAC enhancements are provided to support the PHY feature of the OFDMA framework. In the same framework, users with SISO, MISO, MIMO capabilities can also be supported.

[0031] As an overview, each user using the OFDM framework for transmitting information may be mapped to a different OFDM resource, which may be a sub-channel such as an AMC sub-channel and / or a diversity sub-channel. For MIMO users, it is preferable to support multiple different space-time coding schemes, such as SM (Spatial Multiplexing) and STTD (Space-Time Transmit Diversity).

[0032] On a continuous basis, there is a stream of OFDM symbols associated with each transmit antenna. Each user may first be mapped to one or more OFDM symbols, and then each OFDM symbol may be mapped to its associated antenna. In some embodiments, this mapping also allows per-antenna rate control (PARC) to be performed.

[0033] Each OFDM symbol is mappable to its asso...

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Abstract

Aspects of the present invention provide MAC enhancements to support the PHY features of a MIMO-OFDMA framework. The MAC enhancements involve DL burst assignment to support adaptive MIMO transmission, UL burst assignment to support adaptive MIMO transmission, fast feedback channel operation to support wireless terminal dynamic feedback of MIMO mode selection, for example space time transmit diversity (STTD) or spatial multiplexing (SM), and/or permutation mode selection, for example diversity or adjacent subcarrier mode, dynamic CQICH allocation and de-allocation and the use of CQICH_ID for DL burst allocation. One or more of these enhancements is included in a given implementation. Methods are also provided for implementing the MAC enhancements.

Description

[0001] related application [0002] This application claims U.S. Provisional Patent Application No. 60 / 559016, filed April 5, 2004, U.S. Provisional Patent Application No. 60 / 564,227, filed April 22, 2004, and U.S. Provisional Patent Application No. 60 / 564,227, filed April 22, 2004 Benefit of Application No. 60 / 564228. technical field [0003] The present invention relates to the wireless transmission of information, and in particular to methods for controlling data transmission in the interests of Multiple Input Multiple Output (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM). Background technique [0004] Orthogonal Frequency Division Multiplexing (OFDM) is a form of multiplexing that distributes data over multiple carriers with extremely precise spacing in the frequency domain. The precise spacing of the carriers provides several benefits such as high spectral efficiency, resilience to radio frequency interference, and lower multipath distortion. Due to its ...

Claims

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Application Information

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IPC IPC(8): H04Q7/22H04Q7/38H04Q7/30H04B7/208H04B7/06H04L1/00H04L1/06
Inventor H·张M·-H·冯S·佩里亚尔瓦P·朱
Owner APPLE INC
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