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Estimating the ratio of traffic channel power to pilot power in a mimo wireless communication system

A technology of traffic channels and power levels, applied in radio transmission systems, diversity/multi-antenna systems, baseband systems, etc., and can solve complex problems

Active Publication Date: 2012-01-25
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these or other previously known techniques may be unnecessarily complicated in some cases, or may overestimate α PC , or possibly produce α PC The excessively noisy estimate of

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  • Estimating the ratio of traffic channel power to pilot power in a mimo wireless communication system
  • Estimating the ratio of traffic channel power to pilot power in a mimo wireless communication system
  • Estimating the ratio of traffic channel power to pilot power in a mimo wireless communication system

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Embodiment Construction

[0021] Embodiments of the invention are described herein with respect to the specification of MIMO operation for the W-CDMA standard, the operation of which is described more fully below. However, the present invention is not so limited and the inventive concepts disclosed and claimed herein are advantageously applicable to a wide variety of transmit diversity systems. Furthermore, use of the term "exemplary" is used herein to mean "illustrative" or "serving as an example," and is not intended to imply that a particular embodiment is preferred over another or that particular features are essential to the invention. . Also, the terms "first" and "second" and similar terms are only used to distinguish one particular instance of an item or feature from another, and do not indicate a particular order or arrangement, unless the context clearly dictates otherwise.

[0022] figure 1 An exemplary wireless communication system 100 is shown employing multiple-input multiple-output (MI...

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Abstract

Methods and apparatus for processing a received multi-stream (MIMO) signal, and in particular for estimating a per-code traffic-channel-to-pilot power ratio for the MIMO signal are disclosed. An exemplary method includes the calculation of an average symbol amplitude or average symbol power level from a plurality of de-spread traffic channel symbols received in a first transmission slot and the estimation of a corresponding pilot symbol amplitude or pilot symbol power level, based on an estimated propagation channel response and at least one of a plurality of precoding vectors used to generate the MIMO signal. A per-code traffic-channel-to-pilot power ratio for the first transmission slot is computed by dividing the average symbol amplitude or average symbol power level by the corresponding pilot symbol amplitude or pilot symbol power level.

Description

technical field [0001] This invention relates generally to wireless telecommunications systems and, more particularly, to methods and apparatus for processing multi-stream multiple-input multiple-output signals in such systems. Background technique [0002] Third generation (3G) Wideband Code Division Multiple Access (W-CDMA) wireless networks as specified by the Third Generation Partnership Project (3GPP) include support for Multiple-Input Multiple-Output (MIMO) transmission technology. (For details, see "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical layer procedures (FDD) (Release 8)", 3GPP TS 25.214, at http: / / www.3gpp.org / ftp / Specs / html -info / 25214.htm.) In systems built to these standards, a 2×2 MIMO scheme can be used to transmit the High Speed ​​Downlink Shared Channel (HS -DSCH). Both streams use the same channelization code, but are separated from each other by orthogonal precoding weights. [0003] Due to imperf...

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Application Information

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IPC IPC(8): H04B7/04
CPCH04B7/0413H04L25/0224
Inventor A·塞德格伦E·琼森
Owner TELEFON AB LM ERICSSON (PUBL)
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