What do you mean by transmit diversity?

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.

What is the frequency diversity?

Frequency diversity is the process of receiving a radio signal or components of a radio signal on multiple channels (different frequencies) or over a wide radio channel (wide frequency band) to reduce the effects of radio signal distortions (such as signal fading) that occur on one frequency component but do not occur …

What is frequency diversity in wireless communication?

Frequency diversity allows the transmission of the same message signal at different carrier frequencies. In order for the received signals to be statistically independent or at least uncorrelated, the carrier frequencies must have a separation that is greater than the coherence bandwidth of the radio channel.

What is microscopic diversity?

A. Microscopic diversity:- Small scale fading is characterized by deep and rapid amplitude fluctuations that occur when mobile moves over a distances of few wavelengths. In order to prevent rapid deep fades from occurring, microscopic diversity is used which exploits rapidly changing signal.

What is receive diversity Why is it required?

In wireless microphone applications, diversity receivers are often used to improve reception of RF signals. A diversity receiver utilizes two separate, independent antenna systems. The receiver looks at the signal coming in from the each antenna, and determines which one is the stronger.

What is transmission beamforming?

Beamforming is a technique that focuses a wireless signal towards a specific receiving device, rather than having the signal spread in all directions from a broadcast antenna, as it normally would. The resulting more direct connection is faster and more reliable than it would be without beamforming.

What is transmission rank?

In the case of SM, the transmission rank is less than or equal to the number of antenna ports (P) and the maximum number of layers that can be supported, known as the channel rank, is equal to the minimum number of transmit and receive antennas.

What is Spread Spectrum?

Spread Spectrum refers to a system originally developed for military applications, to provide secure communications by spreading the signal over a large frequency band. These narrowband signals are easily jammed by any other signal in the same band.

How many types of diversity are there in wireless communication?

The transmission wave with two different polarization constitute two different paths. This provide only two different diversity branches. Polarization Diversity uses half power by dividing the power between two different polarized antennas.

Is transmission diversity feasible in tdicor?

However, the feasibility of transmission diversity depends on the level of timing accuracy. Finally, in TDiCOR transmit diversity is used not only for cooperative acknowledgements but also for cooperative data transmissions.

How does Delay Diversity convert spatial diversity into frequency diversity?

The delay diversity converts spatial diversity into frequency diversity by transmitting the data signal from the first antenna port and a delayed replica of the signal from the second antenna port.

What is frequency diversity and time diversity?

Frequency diversity is equivalent to spreading the signal over the entire bandwidth. Both time and frequency diversity are captured by convolutional coder/symbol repetition and interleaver. The rake receiver captures signal energy from all bands. Each forward link channel may be allocated an identical Walsh code on all carriers.

How does SDMA increase the flexibility of a network?

The flexibility of SDMA is increased by allowing a different number of streams to reach each user in order to increase the cell average data rate. SU-MIMO and MU-MIMO constitute what is called single-site MIMO.