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2. IEEE 802.11ah - Wikipedia

   en.wikipedia.org/wiki/IEEE_802.11ah

   IEEE 802.11ah is a wireless networking protocol published in 2017 called Wi-Fi HaLow (/ ˈ h eɪ ˌ l oʊ /) as an amendment of the IEEE 802.11-2007 wireless networking standard. It uses 900 MHz license-exempt bands to provide extended-range Wi-Fi networks, compared to conventional Wi-Fi networks operating in the 2.4 GHz, 5 GHz and 6 GHz bands.

3. WiFi Sensing - Wikipedia

   en.wikipedia.org/wiki/WiFi_Sensing

   WiFi sensing (also referred to as WLAN sensing) uses existing Wi-Fi signals to detect events or changes such as motion, gesture recognition, and biometric measurement (e.g. breathing). [2] [3] WiFi sensing is a combination of Wi-Fi and radar sensing technology working in tandem to enable usage of the same Wi-Fi transceiver hardware and RF ...

4. Barcode - Wikipedia

   en.wikipedia.org/wiki/Barcode

   Barcode. A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called ...

5. Space–time block code - Wikipedia

   en.wikipedia.org/wiki/Space–time_block_code

   Space–time block code. Space–time block coding is a technique used in wireless communications to transmit multiple copies of a data stream across a number of antennas and to exploit the various received versions of the data to improve the reliability of data transfer. The fact that the transmitted signal must traverse a potentially ...

6. Legality of piggybacking - Wikipedia

   en.wikipedia.org/wiki/Legality_of_piggybacking

   Laws regarding "unauthorized access of a computer network" exist in many legal codes, though the wording and meaning differs from one to the next.However, the interpretation of terms like "access" and "authorization" is not clear, and there is no general agreement on whether piggybacking (intentional access of an open Wi-Fi network without harmful intent) falls under this classification.

7. Service set (802.11 network) - Wikipedia

   en.wikipedia.org/wiki/Service_set_(802.11_network)

   In IEEE 802.11 wireless local area networking standards (including Wi‑Fi), a service set is a group of wireless network devices which share a service set identifier (SSID)—typically the natural language label that users see as a network name. (For example, all of the devices that together form and use a Wi‑Fi network called "Foo" are a ...

8. Error correction code - Wikipedia

   en.wikipedia.org/wiki/Error_correction_code

   Low-density parity-check (LDPC) codes are a class of highly efficient linear block codes made from many single parity check (SPC) codes. They can provide performance very close to the channel capacity (the theoretical maximum) using an iterated soft-decision decoding approach, at linear time complexity in terms of their block length.

9. Low-density parity-check code - Wikipedia

   en.wikipedia.org/wiki/Low-density_parity-check_code

   LDPC codes functionally are defined by a sparse parity-check matrix. This sparse matrix is often randomly generated, subject to the sparsity constraints—LDPC code construction is discussed later. These codes were first designed by Robert Gallager in 1960. Below is a graph fragment of an example LDPC code using Forney's factor graph notation.