What would the correct notation for a MIMO radio be, if it were single stream,and had dual diversity antennas?
1x1:1 doesn't tell the whole story. 2x2:1 just looks better.
Any ideas ?
Well how many radios can transmit and how many can receive? Dual diversity make me think dual receive radios. Maybe a 1x2:1 specification? You think 2x2?
The question really boils down to whether, or how, multiple "antennas" should be noted.
A single stream is a single stream, hence the ":1". Antennas don't equate to radios.
I'm beginning to think that a single stream radio, can't be called MIMO, no matter what. It may support "n" rates, but that's all.
I would simply call it 1x1 802.11n with simple (switched) diversity; it definitely is not MIMO at all. As you know, 802.11n and MIMO aren't synonymous. I also don't think you need to note multiple antennas in any way, the same way we don't in 802.11a/g.
Is it correct that the notation for 802.11n MIMO is (tx:rx:# spatial streams)? With that said, wouldn't the diversity antennas both transmit and receive thereby notating 2x2:1?
Yes, that 802.11n notation (tx:rx:ss) is true. They would both transmit and receive, but they are both tied to the same radio hardware, so only one transmits and receives at a time, making it a SISO system. In 802.11n terms, you could label a SISO system as 1x1:1. These numbers are all about radio architecture and have nothing to do with the number of antennas.
This is slightly beyond the current conversation but is still relevant...
802.11n specifies a technology (not used today) called antenna selection (ASEL) that can pick the best antennas to use based on the RF environment. ASEL requires more antennas than radio chains (where today's deployments usually have an equal number of antennas per radio chain and frequency band), so if you have a 2x2 single-band AP (1 radio with 2 radio chains), you could have 4 antennas (2 per radio chain) and let an ASEL algorithm pick the best antennas to use for each wireless peer. This is a bit like simple antenna diversity (switched antennas) on top of MIMO. Neat stuff.
Yes, that notation for MIMO is correct.
So, you can see why I originally said 2x2:1 !
However, I now think that any attempt to call any single stream n-radio "MIMO" is incorrect.
I wouldn't be surprized if some marketing types still picked up on the 2x2:1 label though.
If marketing types do, we will harangue them with vehement zeal. :D
Buying jewelry is a pleasant thing, when the jewels are of our own. how to use and maintenance is also something important to us. The way to cartier love bracelet price uk Maintenance our jewelry such as cartier love bracelet which are famous in the jewelry market seems to be useless. The standpoint of cartier love bracelet price singapore science is not necessarily correct. It is necessary for its remedy. Furthermore, some consumers do not understand cartier love charity bracelet 2011 the use of jewelry when the real use of protective methods.In fact, maintenance and cleaning of jewelry, there are many details cartier love charity bracelet price to note, for example: do not often touch the jewelry; makeup, do not let the perfume sprayed on cartier love charity bracelet colors the surface of jewelry; pearls should always soaked in water to supplement the humidity; ultrasonic cleaner is not commonly used, and to regularly check the small drill there ... and so the phenomenon of cartier love charity bracelet replica loosening. Here are four correct precautions to wear jewelry and maintenance methods for consumers to avoid inadvertent damage jewelry.It seems easy to protect clean always. Actually speaking, if many people saw the pretty, pretty jewelry, precious stones, they could not help to touch the surface of the jewelry. doing so will affect the gem's luster and brightness of jewelry and diamonds.