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GSM channeliser aimed at GSM phone signal interception

Posted: 19 May 2014     Print Version  Bookmark and Share

Keywords:Pentek  GSM  channeliser  Xilinx  FPGA 

Pentek has announced the latest member of its Cobalt family. According to the company, the model 52663 is a full spectrum GSM channeliser 3U VPX module running a highly-optimised IP core for the Xilinx Virtex-6 FPGA.

The unit is geared for mobile monitoring systems that must capture some or all of the 1100 uplink and downlink signals in both upper and lower GSM bands. This full global system for mobile communications spectrum monitoring targets homeland security, government and military applications.

Intended for GSM phone signal interception, model 52663 accepts four analog inputs from an external analog RF tuner, such as the Pentek Model 8111, where the GSM RF bands are down converted to an IF frequency.

model 52663

These IF signals are then digitised by four ADCs and routed to four channeliser banks that perform digital downconversion of all GSM channels to baseband. Two of the banks handle 175 channels for the lower GSM transmit/receive bands and two banks handle 375 channels for the upper bands. The DDC channels within each bank are equally spaced at 200kHz.

Each DDC output is re-sampled to a 4x symbol rate of 1.08333MHz to simplify symbol recovery. Every four DC outputs are combined into a frequency-division "superchannel" that allows transmission of all 1100 channels across the PCIe Gen 2 x8 interface.

The GSM channeliser IP core is supported with additional factory-installed FPGA functions including packet formation, time stamping, four DMA controllers, gating and triggering. Baseband super-channel packets are sent via DMA controllers to processor memory where customers apply processing algorithms.

- Julien Happich
  EE Times Europe

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