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Wireless communication method and apparatus for performing post-detection constellation correction

A detector, real symbol technology, used in synchronization devices, signal channels, demodulation of amplitude modulation oscillations, etc.

Inactive Publication Date: 2011-09-14
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is not the lack of a current channel estimate that produces distortion, but never converges because the receiver remains in the tracking state

Method used

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  • Wireless communication method and apparatus for performing post-detection constellation correction
  • Wireless communication method and apparatus for performing post-detection constellation correction
  • Wireless communication method and apparatus for performing post-detection constellation correction

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Embodiment Construction

[0016] The preferred embodiments will be described with reference to the drawings, wherein like numerals represent like components throughout.

[0017] Hereinafter, the term "WTRU" may include, but is not limited to, user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, or any other type of component operable in a wireless environment.

[0018] The present invention can roughly be applied to such as Universal Mobile Telecommunications System Time Division Duplex (UMTS-TDD) and Time Division Duplex, Time Division Synchronous Code Division Multiple Access (TD-SCDMA), Code Division Multiple Access 2000 (CDMA2000) and Any type of wireless communication system with Code Division Multiple Access or any other type of wireless communication system. Relatedly, the present invention can be implemented in EV-DO (ie, data only) and EV-DV (ie, data and voice).

[0019] The inventive features may be incorporated into an integrated circuit or configured in a circuit c...

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PUM

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Abstract

A method and apparatus for correcting the phase and gain of data associated with a constellation pattern of a plurality of received individual symbols. Each symbol is divided into real and imaginary symbol components. The signs of the real and imaginary symbol components of each symbol are determined and used as a basis for determining whether the symbol is associated with a firs t or third quadrant of the constellation pattern or a second or fourth quadrant of the constellation pattern. The absolute values of the real and imaginary symbol components are determined and used to create a first sum and a second sum. A phase adjustment value Theta and a gain adjustment value G are derived from the first and second sums, and are used to create a complex number. Each of the received individual symbols is multiplied by the created complex number to provide corrected constellation pattern data.

Description

technical field [0001] The present invention relates to wireless communication receivers. More particularly, the present invention relates to receiving wireless signals in the presence of imperfect channel estimation. Background technique [0002] When transmitted in a multipath environment, the propagation channel introduces distortion of the transmitted signal that degrades the signal quality at the receiver. In many wireless communication systems, knowledge of the channel state is necessary to properly demodulate transmissions. Therefore, channel estimation is performed at the receiver and then used to demodulate the data. [0003] Quadrature amplitude modulation (QAM) is a method of combining two amplitude modulated (AM) signals into a single channel, thereby doubling the effective bandwidth. Quadrature amplitude modulation is used in digital systems, especially in wireless applications, using pulse-amplitude modulation (PAM). There are two carriers in a quadrature A...

Claims

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Application Information

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IPC IPC(8): H03K9/00H03D1/00H04L27/08H04BH04L5/12H04L27/38
CPCH04L27/3809H04L27/3872H04L27/3863H04L7/02H04L5/12H04L5/02
Inventor 菲利普·J·佩特拉斯基
Owner INTERDIGITAL TECH CORP
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