GSR-SW108x8

Octa 1x8 RF Switch Modules - Gaustech

GSR-SW108x8 is an octa 1×8 RF Switch Modules, designed for MIMO measurement application such as MIMO channel sounding.

Overview

Overview

The most distinctive feature of the GSR-SW108x8 is the integrated Advanced Trigger Mode, which allows the user to customize the trigger interval and switching time as well as the number of cycle triggers. Once these parameters are configured through the serial port, the GSR-SW108x8 can be triggered by external TTL signals to perform the customized triggering.

The GSR-SW108x8 is typically used at the Rx side of MIMO channel measurements to expand the Rx channels. Since the GSR-SW108x8 is a high-speed toggle switch, it can perform switching tasks at the microsecond level, thus accomplishing the switching between multiple antenna channels within the correlated time.

The timing of the FPGA control board in GSR-SW108x8 is shown in the figure and the control process is as follows.
1. A clock distributor or function generator generates the PPS signal, which is usually a pulse signal with an interval of 1 s. The PPS signal is connected to the switch, the base station Rx and the transmitter source Tx3 via an SMA cable.
2. The PPS signal is connected to the switch, the base station Rx and the transmitter source Tx via an SMA cable.
3. After a programmable delay td, the switch switches from the disconnected state (NC) to ch0, which in turn switches at time intervals tc ch1…. .ch7… NC, tc is user configurable.
4. The switch can be switched in multiple rounds, and the switching rounds are user configurable.
5. Rx and Tx trigger acquisition and transmission after receiving the PPS signal. The transmit signal consists of the protection interval GD and the channel measurement sequence ZC. the duration of GD+ZC+GD must be equal to tc.
6. After receiving the signal, the Rx extracts the ZC signal through the correlation function and extracts the channel parameters based on the acquired ZC signal.

Overview

The most distinctive feature of the GSR-SW108x8 is the integrated Advanced Trigger Mode, which allows the user to customize the trigger interval and switching time as well as the number of cycle triggers. Once these parameters are configured through the serial port, the GSR-SW108x8 can be triggered by external TTL signals to perform the customized triggering.

The GSR-SW108x8 is typically used at the Rx side of MIMO channel measurements to expand the Rx channels. Since the GSR-SW108x8 is a high-speed toggle switch, it can perform switching tasks at the microsecond level, thus accomplishing the switching between multiple antenna channels within the correlated time.

The timing of the FPGA control board in GSR-SW108x8 is shown in the figure and the control process is as follows.
1. A clock distributor or function generator generates the PPS signal, which is usually a pulse signal with an interval of 1 s. The PPS signal is connected to the switch, the base station Rx and the transmitter source Tx3 via an SMA cable.
2. The PPS signal is connected to the switch, the base station Rx and the transmitter source Tx via an SMA cable.
3. After a programmable delay td, the switch switches from the disconnected state (NC) to ch0, which in turn switches at time intervals tc ch1…. .ch7… NC, tc is user configurable.
4. The switch can be switched in multiple rounds, and the switching rounds are user configurable.
5. Rx and Tx trigger acquisition and transmission after receiving the PPS signal. The transmit signal consists of the protection interval GD and the channel measurement sequence ZC. the duration of GD+ZC+GD must be equal to tc.
6. After receiving the signal, the Rx extracts the ZC signal through the correlation function and extracts the channel parameters based on the acquired ZC signal.

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