"unknown background" is correct and usable in written English.
It is usually used to refer to things that are not known or have not been revealed, such as a person's history or identity. For example, "The whereabouts of the mysterious creature remain unknown, as do its origins and unknown background."
Unknown background: Although we classified evergreen bush, its background type and dynamic reflectance were almost unknown.
These co-workers were a mixed bag of European nationalities of unknown background.
For example, making new friends with unknown background via social networking tools might be dangerous to children.
The resulting schemes achieve convergence in a few iterations and can effectively estimate TF dispersive channels and obtain reliable data detection under unknown background noise environments.
In this paper, joint data detection and channel and noise variance estimation for MIMO-OFDM systems operating in TF dispersive channels under unknown background noise are investigated.
But given the complex global supply chain of parts that go into most products, unknown backdoors created by companies with unknown backgrounds and connections may pockmark final systems.
"There are over 100 dog breeds that are far more suitable to perform tasks for persons with disabilities than pit bulls, especially rescued pit bulls with unknown backgrounds," said Colleen Lee, founder and president of DogsBite.org, a national group that tracks bites and works to reduce attacks through bans and other laws.
Although this can yield high detection rates in specific populations for specific genes (such as cystic fibrosis in Caucasians), they are suboptimal for other ethnicities or for patients of mixed or unknown ethnic background.
Of the deployments, 39percentt of those directly impacted were black, while 20percentt were white, 11percentt were Latino, and 30percentt were of unknown racial background.
IgA nephropathy (IgAN) is a poorly understood disease with a largely unknown molecular background.
