US 10,652,068 B2 · Synchronization signal detection

Abstract

Detection of Narrow-Band IOT (NB-IOT) Synchronization signal and Cyclic Prefix length determination at UE. The detection method implements symbol level correlation, comprising: filtering the radio signal with a plurality of matched filters to obtain a correlation for each OFDM symbol in the synchronization signal, wherein each matched filter provides a correlation with one OFDM symbol in the synchronization signal; delaying and combining the outputs of the plurality of matched filters in a first way to provide a first combined output for the normal cyclic prefix configuration and delaying and combining the outputs of the plurality of matched filters in a second way to provide a second combined output for the extended cyclic prefix configuration; and detecting a correlation peak indicative of the synchronization signal in one of the first or second combined outputs. The present disclosure also relates to a user equipment including the apparatus.

Claims26

Dependent claims

A method in a Narrow-Band Internet of Things (NB-IoT) device of detecting a synchronization signal comprising a number of OFDM symbols distributed within a sequence of OFDM symbols in a subframe of a received radio signal wherein the OFDM symbols have either a first cyclic prefix configuration or a second cyclic prefix configuration, the method

comprising:
filtering the radio signal with a plurality of matched filters to obtain correlations for OFDM symbols which may be used in the synchronization signal, wherein each matched filter provides a correlation with one OFDM symbol which may be used in the synchronization signal;
delaying and combining the outputs of the plurality of matched filters in a first way to provide a first combined output for the first cyclic prefix configuration, and in a second way to provide a second combined output for the second cyclic prefix configuration;
and
detecting a correlation peak indicative of the synchronization signal in one of the first or second combined outputs.

2 more elements

An apparatus in a Narrow-Band Internet of Things (NB-IoT) device for detecting a synchronization signal comprising a number of OFDM symbols distributed within a sequence of OFDM symbols in a subframe of a received radio signal wherein the OFDM symbols have either a first cyclic prefix configuration or a second cyclic prefix configuration, the apparatus comprising:

a plurality of matched filters configured to filter the radio signal to obtain correlations for OFDM symbols which may be used in the synchronization signal, wherein each matched filter provides a correlation with one OFDM symbol which may be used in the synchronization signal;
and
a delaying and combining circuit configured to delay and combine the outputs of the plurality of matched filters in a first way to provide a first combined output for the first cyclic prefix configuration, and in a second way to provide a second combined output for the second cyclic prefix configuration;
and
a peak detector configured to detect a correlation peak indicative of the synchronization signal in one of the first or second combined outputs.

2 more elements

Dependencies are inferred from the claim text.

Synchronization signal detection

Life of this patent

Synchronization signal detection

Life of this patent

Abstract

Claims26