Method for demodulation and demodulator

Patent metadata

Field	Value
Publication number	US-9923752-B2
Application number	US-201615361766-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	May 28, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A method is provided for demodulation of an analog receive signal carrying information, wherein a number of more than two analog signals is formed from the receive signal in separate channels such that the receive signal is multiplied in each case by a period function, the phase thereof respectively differing in the channels, and wherein the multiple signals are each low-pass filtered.

First claim

What is claimed is:

1. A method for demodulating an analog receive signal carrying information, the method comprising:
generating more than two separate channels;
forming more than two analog signals from the analog receive signal by multiplying the analog receive signal by a periodic function in each of the more than two separate channels, a phase of the periodic function respectively differing in each of the more than two separate channels; and
low pass filtering and separately digitizing each of the more than two analog signals to form filtered analog signals.

2. The method according to claim 1 , wherein the periodic function differs from the analog receive signal and is selected as a sine function.

3. The method according to claim 1 , wherein the filtered analog signals are each digitized to form digital signals.

4. The method according to claim 3 , wherein the filtered analog signals are each digitized using a word width of less than 4 bits or a word with of 1 bit.

5. The method according to claim 3 , wherein a bandwidth of the low pass filtering of the more than two analog signals and a sampling rate of the digitization are selected such that the sampling rate corresponds to at least twice the bandwidth.

6. The method according to claim 1 , wherein the analog receive signal is of a given carrier frequency, which carries the information in a modulated manner.

7. The method according to claim 6 , wherein the filtered analog signals are each low-pass-filtered by separating higher frequency products with respect to the carrier frequency.

8. The method according to claim 6 , wherein the periodic function of the carrier frequency is selected as a repetition frequency.

9. The method according to claim 1 , wherein phases of the periodic function are each selected equidistantly apart in the separate channels.

10. The method according to claim 1 , wherein at least one parameter of a transmission path is estimated based on the filtered analog signals.

11. The method according to claim 10 , wherein a phase shift, a runtime, a time shift, a Doppler shift or a signal strength is estimated as the parameter.

12. The method according to claim 1 , wherein the information carried by the analog receive signal is estimated or decoded based on the filtered analog signals.

13. The method according to claim 10 , wherein a maximum likelihood method is used for the estimation.

14. A demodulator for demodulating an analog receive signal carrying information, the demodulator comprising:
an input channel for the analog receive signal;
a demodulation unit configured to carry out the method according to claim 1 ;
at least two output channels;
a multiplication device; and
a low pass filter device, wherein the multiple signals are each made available at the input channels.

15. The demodulator according to claim 14 , wherein the demodulation unit includes an AD converter.

16. The demodulator according to claim 15 , wherein the AD converter includes AD converters assigned to the channels, each of which configured for digitization with a word width of less than 4 bits or a word width of 1 bit.

17. The demodulator according to claim 14 , wherein an estimation or decoding device, which is connected by information technology to the output channels of the demodulation unit, is also included, which is configured to estimate or decode at least one parameter of a transmission path and/or the information carried by the receive signal from the multiple digitized signals.

18. The demodulator according to claim 17 , wherein the estimation or decoding unit is a maximum likelihood estimator.

Assignees

• Univ Muenchen Tech

Inventors

• Nossek Josef
• Stein Manuel
• Theiler Sebastian

Classifications

• H04B1/06

  Receivers · CPC title

• H04B1/0017

  Digital filtering (H04B1/001 takes precedence; digital filters per se H03H17/00) · CPC title

• H04L27/38 Primary

  Demodulator circuits; Receiver circuits · CPC title

• H04B17/20

  of receivers · CPC title