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1. (WO2017176379) NARROW BAND SYNCHRONIZATION SIGNAL TRANSMISSION AND DETECTION

Pub. No.:    WO/2017/176379    International Application No.:    PCT/US2017/018742
Publication Date: Fri Oct 13 01:59:59 CEST 2017 International Filing Date: Wed Feb 22 00:59:59 CET 2017
IPC: H04J 11/00
H04L 27/26
Applicants: QUALCOMM INCORPORATED
Inventors: LEI, Jing
GAAL, Peter
XU, Hao
WANG, Xiao feng
Title: NARROW BAND SYNCHRONIZATION SIGNAL TRANSMISSION AND DETECTION
Abstract:
In order to reduce ambiguity in NB-SSS and complexity of receiver processing, a transmitter apparatus generates an SSS, wherein the SSS signal comprises a sequence of OFDM symbols, wherein each symbol of the sequence of SSS symbols is mapped to a codeword symbol of an FEC code. Source symbols of the sequence of SSS symbols carry a PCID and frame timing information, and parity symbols of the sequence of SSS symbols introduce redundancy and coding gain. A receiver receives the NB-SSS over multiple OFDM symbols, each symbol of the SSS comprising a short ZC sequence with a combination of root index and cyclic shift. The apparatus derives path metrics using cross-correlation for each of the plurality of symbols, determines a candidate SSS source message based on the derived path metrics and coding constraints of FEC codewords, and identifies a PCID and timing information based on the candidate SSS source message.