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  2. Space–time block code - Wikipedia

    en.wikipedia.org/wiki/Space–time_block_code

    These codes achieve rate-1/2 and rate-3/4 respectively. These two matrices give examples of why codes for more than two antennas must sacrifice rate — it is the only way to achieve orthogonality. One particular problem with , / is that it has uneven power among the symbols it transmits.

  3. Satellite television - Wikipedia

    en.wikipedia.org/wiki/Satellite_television

    Free-to-view channels are encrypted but not charged-for, while pay television requires the viewer to subscribe and pay a monthly fee to receive the programming. [ 2 ] Modern systems signals are relayed from a communications satellite on the X band (8–12 GHz) or K u band (12–18 GHz) frequencies requiring only a small dish less than a meter ...

  4. Video recorder scheduling code - Wikipedia

    en.wikipedia.org/wiki/Video_recorder_scheduling_code

    The actual algorithms used to encode and decode the television guide values from and to their time representations were published in 1992, but only for six-digit codes or less. [1] [2] Source code for seven and eight digit codes was written in C and Perl and posted anonymously in 2003. [3]

  5. Antenna effect - Wikipedia

    en.wikipedia.org/wiki/Antenna_effect

    Figure 3: Illustration of three possible fixes to an antenna violation. In general, antenna violations must be fixed by the router. Possible fixes include: Change the order of the routing layers. If the gate(s) immediately connects to the highest metal layer, no antenna violation will normally occur. This solution is shown in Figure 3(a).

  6. List of three-letter broadcast call signs in the United States

    en.wikipedia.org/wiki/List_of_three-letter...

    Not included are unlicensed operations, such as carrier current, cable TV, and Internet stations — for example, San Diego State University's "KCR" — which have adopted call-letter-like identifiers that are not officially issued by the FCC.

  7. Fix problems signing into your AOL account - AOL Help

    help.aol.com/articles/help-signing-in

    Use the Sign-in Helper to locate your username and regain access to your account by entering your recovery mobile number or alternate email address.; To manage and recover your account if you forget your password or username, make sure you have access to the recovery phone number or alternate email address you've added to your AOL account.

  8. List of television stations in North Carolina - Wikipedia

    en.wikipedia.org/wiki/List_of_television...

    Area served Community of license VC RF Callsign Network Notes Asheville/~Greenville–Spartanburg–Anderson: Asheville: 13 13 WLOS: ABC: MyNet on 13.2 , Antenna TV on 13.3, The Nest on 13.4

  9. Space–time code - Wikipedia

    en.wikipedia.org/wiki/Space–time_code

    A space–time code (STC) is a method employed to improve the reliability of data transmission in wireless communication systems using multiple transmit antennas. STCs rely on transmitting multiple, redundant copies of a data stream to the receiver in the hope that at least some of them may survive the physical path between transmission and ...