The antennas don't move they employ an antenna selection algorithm. The receiver is equipped with two antennas: antenna A and antenna B. During signal detection the receiver switches back and forth between these two antennas. The gain controller sets the gain such that the condition is fulfilled for the highly energized antenna. Saturation of the receiver's amplifier is avoided no matter which antenna is attached. Once the gain is set, the receiver estimates two sets of channel coefficients. Each set refers to a different antenna and consists of two channel coefficients, a single coefficient for each carrier. As soon as estimations are completed, the receiver has to select either antenna A or antenna B, in order to receive the rest of the data. This type of diversity has been used in PCS networks for years but has never caught on do the high implementation cost and questionable ROI. Beside compensating for SNR the antennas actually use multipath to their advantage.
jon baer wrote: > > cans, users can increase signals from three to 20 times. Users can also > > expect to soon see "smart" antennas that use software to aim and focus > > signals. (Source: New York Times) > > I read somewhere that this is what is happening (or going to happen) to the > new Thinkpads and Centrino based laptops ... cards w/ multiple moving > antennas that adjust to SNR around them ... > > - Jon > > -- > NYCwireless - http://www.nycwireless.net/ > Un/Subscribe: http://lists.nycwireless.net/mailman/listinfo/nycwireless/ > Archives: http://lists.nycwireless.net/pipermail/nycwireless/ -- "NEXTEL-1 IT'S NOT JUST NEXTEL" Note The New address Subscribe to Nextel-1: http://www.groups.yahoo.com/subscribe/NEXTEL-1 "NEXTEL2 FOR iDEN SOFTWARE DEVELOPERS" Subscribe to Nextel2: http://www.groups.yahoo.com/subscribe/NEXTEL2 "WIRELESS FORUM HOMELAND SECURITY GROUP" The Complete Resource for Wireless Homeland Security. Subscribe to WFHSG: http://www.groups.yahoo.com/subscribe/WFHSG -- NYCwireless - http://www.nycwireless.net/ Un/Subscribe: http://lists.nycwireless.net/mailman/listinfo/nycwireless/ Archives: http://lists.nycwireless.net/pipermail/nycwireless/
