MIMO parameters (W-CDMA(3GPP)/HSPA)
The MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. parameters on the tab of allow MIMO channel compensation and to further define the HSPA+ MIMO signal characteristics. The MIMO parameters add channel compensation for the PCI "precoding matrix" and to specify the frequency Receiver/Transmitter frequency offset impairment model.
| MIMO Parameter | Description |
|---|---|
|
|
parameter enables MIMO channel compensation. is only used when the VSA is in MIMO analysis mode. Default = Selected |
|
|
parameter specifies the precoding matrix (0, 1, 2, or 3) used in the analysis. This parameter is only used if MIMO analysis is selected. Default = 0 |
|
specifies whether the transmitter or receiver impairment model is applied to the frequency offset measurement, see Using MIMO Freq Offset Model. |
Using Freq Offset Model
The parameter specifies the W-CDMA Code Division Multiple Access: One of several digital wireless transmission methods in which signals are encoded using a specific pseudo-random sequence, or code, to define a communication channel. A receiver, knowing the code, can use it to decode the received signal in the presence of other signals in the channel. This is one of several "spread spectrum" techniques, which allows multiple users to share the same radio frequency spectrum by assigning each active user an unique code. CDMA offers improved spectral efficiency over analog transmission in that it allows for greater frequency reuse. Other characteristics of CDMA systems reduce dropped calls, increase battery life and offer more secure transmission. See also IS-95. HSPA+MIMO measurement Frequency Offset impairment model . When Receiver is selected, the receiver impairment model is assumed. The transmitter locks between antenna ports and the measurement estimates receiver frequency offset. When Transmitter is selected, the transmitter impairment model is assumed.The receiver is assumed to have locked frequency clocks between input ports and the measurement estimates transmitter frequency offset. Note that the will have an impact on how to interpret the "(CPICH Common Pilot Channel) Freq Offset" result in the MIMO Info summary table.
See Also
