CD-RAY Posted February 29, 2012 Report Posted February 29, 2012 ,,,A system which uses multiple antennas at the transmitter and a single antenna at the receiver is named Multiple Input Single Output (MISO). A technique known as STC (Space Time Coding) is employed at the transmitter with two antennas. STC allows the transmitter to transmit signals (information) both in time and space, meaning the information is transmitted by two antennas at two different times consecutively. Multiple antennas (each with an RF chain) of either SIMO or MISO are usually placed at a base station (BS). This way, the cost of providing either a receive diversity (in SIMO) or transmit diversity (in MISO) can be shared by all subscriber stations (SSs) served by the BS. MIMO (Multiple Input Multiple Output)often employs Spatial Multiplexing (SM) to enable signal (coded and modulated data stream) to be transmitted across different spatial domains. Meanwhile, Mobile WiMAX supports multiple MIMO modes, that's using either SM or STC or both to maximize spectral efficiency (increase throughput) without shrinking the coverage area. The dynamic switching between these modes based on channel conditions is called Adaptive MIMO Switching (AMS). If combined with AAS (Adaptive Antenna System), MIMO can further boost WiMAX performance. MIMO is a hot topic in today wireless communications since all wireless technologies (PAN, LAN, MAN, and WAN) try to add it to increase data rate multiple times to satisfy their bandwidth-hungry broadband users.,,,THIS IT"S THE MIMO-ANTENNA...ch@o! Quote
CD-RAY Posted March 1, 2012 Author Report Posted March 1, 2012 ,,,and other more simple MIMO- antenna... Quote
CD-RAY Posted March 2, 2012 Author Report Posted March 2, 2012 ,,,and this, it is technical drawing for the first antenna, being valid for the other antennas... ch@o! Quote
CD-RAY Posted March 3, 2012 Author Report Posted March 3, 2012 ,,,and now,a way to connect two antennas,with a splitter, to an Access Point or anothers devices...ch@o! Quote
CD-RAY Posted March 3, 2012 Author Report Posted March 3, 2012 ,,,a variant MIMO Antenna,but this time on a double Printed Circuit Board(PCB) and of course much shrunk in size to those listed above... Quote
