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Joint timing recovery and equalization for an N-antenna system

A timing recovery, antenna technology, applied in diversity/multi-antenna systems, radio transmission systems, components of TV systems, etc., can solve problems such as receiver system performance degradation, TR algorithm unable to obtain synchronization lock, etc.

Inactive Publication Date: 2007-05-16
PENDRAGON WIRELESS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, a heavily distorted channel can mean that the TR algorithm cannot acquire synchrolock, and this degrades the performance of the entire receiver system significantly

Method used

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Embodiment Construction

[0023] The present invention provides a digital television receiver which combines equalization and timing recovery functions. More particularly, a DTV receiver according to the present invention utilizes an equalized signal as input to a timing recovery loop.

[0024] A preferred embodiment of a DTV receiver 100 according to the invention is shown in connection with an antenna 5 in FIG. 2 . The DTV receiver comprises a sample rate converter (SRC) 10, a carrier recovery (CR) circuit 12, a square root raised cosine (SQRC) filter 14, a forward equalizer (FE) 16, a sync detector ( SD) 18, an arithmetic unit 30 and a decision unit (DD) 40, which are arranged in an arrangement similar to that given in FIG. However, in FIG. 2, timing recovery (TR) circuit 20' receives the output of FE16 and generates a TR control signal which is applied to the control input of SRC10. Note also that the output of DD 40 is applied to feedback equalizer 50, and the output of the feedback equalizer is a...

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Abstract

A timing recovery loop in the front end of a digital receiver includes a sample rate converter which receives a symbol stream at a first sampling rate and outputs the symbol stream at a second sampling rate responsive to a timing recovery (TR) control signal, a forward equalizer generating an equalized feedback signal based on the symbol stream at the second sampling rate, and a timing recovery circuit generating the TR control signal based upon the equalized feedback signal. If desired, the timing recovery loop may include a carrier recovery circuit electrically coupling the sample rate converter to the forward equalizer and a finite impulse response (FIR) filter electrically coupling the carrier recovery circuit to the forward equalizer. In an exemplary case, the FIR filter is a square-root raised cosine filter. A method for controlling the timing recovery loop based on the equalized feedback signal and a corresponding timing recovery control signal are also described.

Description

technical field [0001] The present invention relates generally to a timing recovery circuit for an antenna system. More particularly, the present invention relates to a joint timing recovery and equalization circuit for an N-antenna system. Corresponding methods are also disclosed. Background technique [0002] Digital transmission is sensitive to multipath fading or similar effects and causes waveform distortion of the transmitted signal, resulting in a degradation of signal quality. In order to minimize this problem, an automatic adaptive equalizer using transversal filters is currently used in practice. Adaptive equalizers can be divided into linear and nonlinear categories. Linear equalization has been widely used in terrestrial digital communication systems. However, it cannot effectively minimize deep or severe multipath distortion. Consequently, the residual intersymbol interference increases undesirably. In particular, as signal transmission rates become higher ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/03H04B7/08H04N5/00H04B7/005H04B7/10H04N5/44H04N21/438
CPCH04N21/4383H04N5/4401H04B7/0845H04N5/211H04L2025/0349H04L7/0029H04L25/03057H04L1/06H04N21/426H04B7/08
Inventor J·梅汉X·欧阳
Owner PENDRAGON WIRELESS LLC
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