Unlock instant, AI-driven research and patent intelligence for your innovation.

Signal quality estimator

A signal quality estimation and signal quality technology, applied in the field of estimating signal quality, can solve problems such as signal distortion and signal degradation

Inactive Publication Date: 2013-03-06
QUALCOMM INC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The communication channel distorts the transmitted signal according to the channel response and also degrades the signal due to noise and interference

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Signal quality estimator
  • Signal quality estimator
  • Signal quality estimator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs.

[0022] The signal quality estimation techniques described here can be used in various communication systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Space Division Multiple Access (SDMA), Orthogonal FDMA (OFDMA) and single-carrier FDMA (SC-FDMA) systems. OFDMA systems utilize Orthogonal Frequency Division Multiplexing (OFDM). The SC-FDMA system utilizes single carrier frequency division multiplexing (SC-FDM). OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also called tones, bins, etc. Each subcarrier may be modulated with data. In general, modulation symbols are sent in the frequen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Techniques for estimating signal quality in a communication system are described. Scaled errors are obtained for inphase (I) and quadrature (Q) components of detected symbols. The scaled errors are determined based on a first function having higher resolution for small errors than large errors between the detected symbols and nearest modulation symbols. The first function may be a square root function or some other function that can provide good resolution for both low and high SNRs. The scaled errors for the I and Q components are combined to obtain combined scaled errors, which are averaged to obtain an average scaled error. A signal quality estimate is then determined based on the average scaled error and in accordance with a second function having non-linearity to compensate for the first function.

Description

[0001] Claim priority based on 35 U.S.C § 119 [0002] This patent application claims priority to Provisional Application No. 60 / 802,630, filed May 22, 2007, entitled "SNRESTIMATOR FOR MIMO OFDM USING QAM HARD DECISIONS," and assigned to the assignee of this application, which is incorporated herein by reference its entire contents. technical field [0003] The present disclosure relates generally to the field of communications, and more particularly to techniques for estimating signal quality in communications systems. Background technique [0004] In a communication system, a transmitter typically processes (eg, encodes and symbol maps) traffic data to generate data symbols, which are modulation symbols for the data. A transmitter then processes the data symbols to generate a modulated signal and sends the signal via a communication channel. Communication channels distort the transmitted signal according to the channel response and also degrade the signal due to noise an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/20
CPCH04L1/206H04L25/067
Inventor M·S·华莱士M·梅农
Owner QUALCOMM INC