US Patent No. 9,172,516

METHOD, SYSTEM AND DEVICE FOR TRANSMITTING DOWNLINK PILOTS


Patent No. 9,172,516
Issue Date October 27, 2015
Title Method, System And Device For Transmitting Downlink Pilots
Inventorship Jing Xu, Beijing (CN)
Deshan Miao, Beijing (CN)
Shaohui Sun, Beijing (CN)
Yu Ding, Beijing (CN)
Guojun Xiao, Beijing (CN)
Jun Chen, Beijing (CN)
Assignee CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)

Claim of US Patent No. 9,172,516

1. A method for transmitting downlink pilots, including the steps of:
transmitting dedicated pilots in the Code Division Multiplexing, CDM, mode or in hybrid of CDM and Frequency Division Multiplexing,
FDM, mode, wherein:

the dedicated pilots are configured with orthogonal sequence sets over resources for transmission of the dedicated pilots
according to a preset frequency-domain granularity and rule and the same orthogonal sequence set is adopted for the dedicated
pilots in each frequency-domain granularity;

wherein when there is more than one group of ports and each group of ports corresponds to more than one sub-carrier, the dedicated
pilots are transmitted over the same sub-carrier in each group of ports in the CDM mode, and a frequency-domain granularity
and/or a rule preset for one group of ports is the same as or different from that for another,

wherein when different groups of ports correspond to a frequency-domain granularity which is a sub-carrier, different orthogonal
sequence sets are adopted for adjacent sub-carriers for transmission of the dedicated pilots in the same group of ports, and
different orthogonal sequence sets are adopted for starting sub-carriers of different groups of ports;

wherein when a rank-number of system transmission is 3 or 4, the same orthogonal sequence is adopted at data layers of transmission
1 and 3, and an orthogonal sequence at layer 4 is opposite to that at layer 2.