Korean Intellectual Property Office
Project: F045
IPC: H04B 7/02
DATE: AUG, 21 , 2015
Definition Proposal
Ref : Annex 9
KR was invited to prepare the English version of definitions, in particular, explaining the relation
between “macro-diversity” and “site diversity”at IP5/WG/33
KR proposes the definitions as below, which includes explanation of the relation between
diversity” and “site diversity”, by referring to the CPC definitions.
“macro-
Diversity systems; Spatially diverse systems – H04B 7/02
Definition statement
This place covers:
Aspects related to diversity, beamforming and antenna weighting:
when the signal has diverse possibilities of being transmitted/ received through one or
several antennas with different characteristics (including time, frequency, space, polarization,
angle, phase...); "diverse possibilities" means the signal does not always have to be
transmitted by more than one antenna. The diversity in this case would be achieved in the
channel between the transmitter and receiver. This channel diversity is aimed to increase
quality and reliability at the receiver;
exploiting gain of one or more fading channels either uncorrelated or correlated (such as
single beam forming and pre-coding);
transmission through multiple beams for single user and multiple user;
feedback of information in order to assign weights and improve reliability of the signal in
transmission/ reception;
generation of antenna weights for multiple antennas;
transmission of a plurality of different signals from different antennas, wherein at least one
of said signals is transmitted (potentially weighted) from more than one antenna; for
example MIMO transmission for N different streams via M different antennas, where M
linear combinations of the N streams are transmitted, each linear combination being
transmitted from each antenna.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Direction finding
G01S 3/72
Aerial arrays or systems
H01Q
Reducing multipath interference in spread spectrum systems
H04B 1/7115
For digital data transmission as such
H04L 1/02
Pure time diversity
H04L 1/00
Rake receivers
H04B 1/7115
SDMA
H04W 16/28
Site diversity or macro-diversity– H04B 7/025
Definition statement
This subgroup covers:
The site diversity technique consists of linking two or more ground stations receiving the
same signal: this way, if the signal is heavily attenuated in one area, another ground stations
can compensate it.
In the field of wireless communication, macro-diversity is a kind of space diversity scheme
using several receiver antennas and/or transmitter antennas for wireless signals. the distance
between the transmitters is much longer than the wavelength.
Macro diversity and site diversity are techniques to limit the effect of fading in wireless
communications, provide opportunity to receive data, even when a route is closed by an
obstacle.
the expression "macro-diversity" is sometime used in the art as a synonym for "site-diveristy"
References relevant to classification in this subgroup
This subgroup does not cover:
for co-located independent aerials
H04B 7/04
Informative references
Attention is drawn to the following places, which may be of interest for search:
Multicasting of data during hand-off to several target
access points
[MIMO] systems– H04B 7/046
Definition statement
H04W 36/026
This subgroup covers:
transmission of a plurality of different signals from different antennas, wherein at least one of
said signals is transmitted (potentially weighted) from more than one antenna; for example
MIMO transmission for N different streams via M different antennas, where M linear
combinations of the N streams are transmitted, each linear combination being transmitted
from each antenna.
Special rules of classification within this group
This group takes precedence over the transmit/receive diversity groups
H04B 7/06 and H04B 7/08.
Synonyms and Keywords
In patent documents, the following abbreviations are often used:
MIMO
=
Multiple Input Multiple Output
SIMO
=
Single Input Multiple Output
MISO
=
Multiple Input Single Output
Power distribution aspects – H04B 7/05
Informative references
Attention is drawn to the following places, which may be of interest for search:
Power control in diversity systems
H04W 52/42