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  2. Amazon Sidewalk - Wikipedia

    en.wikipedia.org/wiki/Amazon_Sidewalk

    Amazon Echo devices have Sidewalk enabled by default and do not inform their owner about it. The feature can be disabled via the official app. [10] A number of prominent news publishers, including The Guardian, [13] ArsTechnica, [11] CNET, [14] PCMag, [15] Click2Houston, [16] and Bleeping Computer, [17] expressed concern with opt-out nature of the network and published guides how to disable ...

  3. Smart antenna - Wikipedia

    en.wikipedia.org/wiki/Smart_antenna

    Smart antennas (also known as adaptive array antennas, digital antenna arrays, multiple antennas and, recently, MIMO) are antenna arrays with smart signal processing algorithms used to identify spatial signal signatures such as the direction of arrival (DOA) of the signal, and use them to calculate beamforming vectors which are used to track and locate the antenna beam on the mobile/target.

  4. Non-orthogonal frequency-division multiplexing - Wikipedia

    en.wikipedia.org/wiki/Non-orthogonal_frequency...

    These samples are then quadrature-mixed to passband in the standard way. The real and imaginary components are first converted to the analogue domain using digital-to-analogue converters (DACs); the analogue signals are then used to modulate cosine and sine waves at the carrier frequency, f c {\displaystyle f_{\text{c}}} , respectively.

  5. MIMO-OFDM - Wikipedia

    en.wikipedia.org/wiki/MIMO-OFDM

    Multiple-input, multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) is the dominant air interface for 4G and 5G broadband wireless communications. It combines multiple-input, multiple-output technology, which multiplies capacity by transmitting different signals over multiple antennas, and orthogonal frequency-division multiplexing (OFDM), which divides a radio channel into ...

  6. Multi-user MIMO - Wikipedia

    en.wikipedia.org/wiki/Multi-user_MIMO

    Multi-user MIMO (MU-MIMO) is a set of multiple-input and multiple-output (MIMO) technologies for multipath wireless communication, in which multiple users or terminals, each radioing over one or more antennas, communicate with one another. In contrast, single-user MIMO (SU-MIMO) involves a single multi-antenna-equipped user or terminal ...

  7. MIMO - Wikipedia

    en.wikipedia.org/wiki/MIMO

    MIMO technology can be used in non-wireless communications systems. One example is the home networking standard ITU-T G.9963, which defines a powerline communications system that uses MIMO techniques to transmit multiple signals over multiple AC wires (phase, neutral and ground). [3]

  8. MIMO radar - Wikipedia

    en.wikipedia.org/wiki/MIMO_radar

    For example, if a MIMO radar system has 3 transmit antennas and 4 receive antennas, 12 signals can be extracted from the receiver because of the orthogonality of the transmitted signals. That is, a 12-element virtual antenna array is created using only 7 antennas by conducting digital signal processing on the received signals, thereby obtaining ...

  9. Bell Laboratories Layered Space-Time - Wikipedia

    en.wikipedia.org/wiki/Bell_Laboratories_Layered...

    Bell Laboratories Layer Space-Time (BLAST) is a transceiver architecture for offering spatial multiplexing over multiple-antenna wireless communication systems. Such systems have multiple antennas at both the transmitter and the receiver in an effort to exploit the many different paths between the two in a highly-scattering wireless environment.

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