Diversity scheme in telecommunications reliability
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Transmit diversity is radio communication using signals that originate from two or more independent sources that have been modulated with identical information-bearing signals and that may vary in their transmission characteristics at any given instant.
It can help overcome the effects of fading, outages, and circuit failures. When using diversity transmission and reception, the amount of received signal improvement depends on the independence of the fading characteristics of the signal as well as circuit outages and failures.
Considering antenna diversity, in many systems additional antennas may be expensive or impractical at the remote or even at the base station. In these cases, transmit diversity can be used to provide diversity benefit at a receiver with multiple transmit antennas only. With transmit diversity, multiple antennas transmit delayed versions of a signal, creating frequency-selective fading, which is equalized at the receiver to provide diversity gain.
Since transmit diversity with N antennas results in N sources of interference to other users, the interference environment will be different from conventional systems with one transmit antenna. Thus even if transmit diversity has almost the same performance as receive diversity in noise-limited environments, the performance in interference-limited environments will differ.
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TransmitDiversity rate = 2 (a.k.a. "Matrix B" in the 802.16 standard). Instead of transmitting the same bit over two antennas, this method transmits...
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STTD may refer to: Space–time block coding based transmitdiversity, a method of transmitdiversity used in UMTS third-generation cellular systems Spacetime...
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pattern to scan in space, which achieves transmitdiversity and represents an early form of cyclic delay diversity. Combinations of CI coding with MIMO precoding...
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receive diversity can also be achieved using a combination of transmitdiversity and space-time block codes. A key advantage of transmitdiversity is that...
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