Base Station Equipment

MCP Channel Unit

MCP Channel Unit.

Square Peg Communications Inc.’s Multi-Channel Platform (MCP) is a hardware and software platform suitable for use in demanding satcom applications.

MCP Channel Units (CUs) are used to implement the physical layer of a variety of air interfaces via a software-defined radio architecture.  They are intended for use in satellite or wireless base stations, signal measurement equipment, physical layer test equipment, channel simulators and other applications utilizing Digital Signal Processing (DSP).

A Channel Unit (CU) card set is comprised of a Channel Unit Front Card (CUFC) and a Channel Unit Rear Card (CURC).  The CUFC is the DSP and FPGA based signal processing engine that implements the physical layer modulators and demodulators.  The CUFC provides an Ethernet IP interface for control, status and data.  It also incorporates an IPMI controller for shelf management in a suitably equipped chassis.

The CURC interfaces to the CUFC at digital complex baseband and provides the 70 MHz IF up and down conversion function.  It provides two transmit IF output ports (TxA and TxB) and two receive IF input ports (RxA and RxB).  Alternative IF or RF interfaces can be implemented by changing only the CURC.

Multiple CUs can be synchronized to an internally generated or externally provided timing pulse.  High availability is facilitated by the use of redundant Ethernet connections, hot swap support and extensive built-in test.  The CU firmware and configuration settings are field upgradeable via Ethernet.

The CU provides four transmit and four receive composite channels, each of which can be independently tuned within the IF band and output to or input from a selected IF feed.  Within each composite channel, the number of bearers is dependent upon the signal bandwidth and the required processing power.

Channel Unit Front Card
Channel Unit Rear Card

IF to Ethernet high availability modem

Ease of maintenance

Software reconfigurable

Utilizes floating point processors providing up to 3.6 GFLOPS or 14.4 GOPS per DSP

Excellent RF performance

Channel Unit Front Card

Form factor
6U PICMG® 2.16
Composite channels4 Tx/Rx (independently tuneable)
Composite channel bandwidthApplication-dependent,
up to 1.25 MHz
Bearer channels per composite channelApplication-dependent; e.g., 4 for BGAN or Classic Aero
DSPs per composite channel1 x 500 / 600 MHz TigerSHARC
or 2 x 500 MHz TigerSHARC
FPGAXilinx Virtex 4 FX60
DSP / FPGA communications1 full duplex link port @ 800 Mbps
2 full duplex link ports @ 200 Mbps
DSP expansion1 expansion connector per DSP cluster for off-board FPGA
Control processorPPC405
Ethernet interface10/100/1000BaseT
Auto-switching between Switch A, Switch B and front panel
IPMI interfacePer PICMG® 2.9
On-card configurationFPGA, DSP & PPC firmware
Primary/secondary image select
User configuration parameters
Indicators8 red/orange/green LEDs per
composite channel
8 red/orange/green application-
specific LEDs
1 blue hot swap LED
PowerApprox. 50W for 4 x 500 MHz DSPs + CURC with 2 Tx + 2 Rx

Channel Unit Rear Card

Number of IF feeds
Up to 2 Tx + 2 Rx
On-card loopback for self-test
Tx/Rx IF frequency range50 to 90 MHz
Max. total power per Tx feed–17 dBm
Max. per-carrier Tx powerDependent upon number of bearers per composite channel, typically –29 dBm
Tx phase noise density@ 100 Hz:   ≤ –70 dBc/Hz
@ 1 kHz:     ≤ –80 dBc/Hz
@ 10 kHz:   ≤ –90 dBc/Hz
@ 100 kHz: ≤ –100 dBc/Hz
Tx spurious< –86 dBm for carrier at –29 dBm
Tx 3rd order intermodulation< –55 dBc (2 carriers at –20 dBm)
Tx I/Q imbalancesNegligible
Typical Rx dynamic range–65 to –25 dBm
–10 dBm max total
Reference input10 MHz @ 0 dBm
Timing sync input (optional)1 pps, TTL
On-card configurationFPGA & PPC firmware
Calibration data
Indicators2 red/orange/green LEDs per feed
1 blue hot swap LED
PowerSupplied by CUFC
Square Peg Communications Inc.
4017 Carling Avenue, Suite 200 
Ottawa, ON, Canada K2K 2A3
Tel + 1 613 271 0044
Fax+ 1 613 271 3007
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