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Methods and apparatus for power allocation and/or rate selection for ul mimo/simo operations with par considerations

A rate and power value technology, applied in the field of power adjustment mechanism, can solve problems such as high signal distortion

Active Publication Date: 2009-09-16
QUALCOMM INC
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, for upload or uplink (UL) MIMO transmissions, equal power allocation is no longer feasible due to peak-to-average ratio constraints
Transmitting the same maximum power from all transmit antennas will drive some amplifiers into their non-linear region and result in higher signal distortion

Method used

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  • Methods and apparatus for power allocation and/or rate selection for ul mimo/simo operations with par considerations
  • Methods and apparatus for power allocation and/or rate selection for ul mimo/simo operations with par considerations
  • Methods and apparatus for power allocation and/or rate selection for ul mimo/simo operations with par considerations

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Embodiment Construction

[0031] The various aspects are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. It may be evident, however, that such aspects may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to describe one or more aspects.

[0032] According to one aspect, a method for a wireless communication system includes receiving a peak-to-average ratio (PAR) backoff value; and determining a power value using the received PAR backoff value. According to one aspect, the PAR backoff value is based at least in part on the modulation type. In another aspect, the method includes determining a rate for UL transmissions. In another aspect, the PAR backoff value is based at ...

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Abstract

A method for a wireless communication includes receiving or storing a peak to average (PAR) back off value; and applying the PAR back off value to determine the transmission power and rate for SIMO and MIMO transmissions. In one aspect, the PAR back off value is at least partially based on modulation type. In another aspect, the PAR back off value is more for higher order QAM than for QPSK. The power allocation algorithm for different UL MIMO schemes is described as follows. For MIMO without antenna permutation (e.g. per antenna rate control), different PAR back off values are considered for different data streams. For MIMO with antenna permutation or other unitary transformation such as virtual antenna mapping or precoding, the PAR back off are determined based on combined channel. The transmission data rate depends on power and also the receiver algorithms such as a MMSE receiver or MMSE-SIC receiver.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority to US Provisional Patent Application No. 60 / 864,573, filed November 6, 2006, entitled "A METHOD ANDAPPARATUS FOR POWER ALLOCATION AND RATE SELECTION FORUL MIMO / SIMO OPERATIONS WITH PAR CONSIDERATIONS." The foregoing application is hereby incorporated by reference in its entirety. technical field [0003] The following description relates generally to wireless communications and, more specifically, to providing mechanisms for power adjustment. Background technique [0004] Wireless communication systems are widely deployed to provide various communication content such as voice, data, and so on. A typical wireless communication system may be a multiple-access system capable of supporting communication with multiple users by sharing available system resources (such as bandwidth, transmission power...). Examples of such multiple-access systems may include: Code Division Multiple Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005
CPCH04W52/367H04L1/0003H04B7/0404H04L27/2614H04W52/146H04W52/42H04L5/0023H04B7/0426H04B7/0456H04W88/08
Inventor D·P·马拉蒂徐浩
Owner QUALCOMM INC
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