Design and FPGA Implementation of Channelizer & Frequency Hopping for Advanced SATCOM System

Abstract

Advanced satellite communication systems should be capable of preventing unauthorized access or exploitation of communication services by adversaries. This can be achieved by use of wideband multi -channel digital transceivers which employ channelizer to extract the channel of interest from digitized RF bands for further baseband processing. Various anti-jamming techniques like Frequency hopping are used to prevent the systems from intentional jamming by the hostile systems. This paper presents an efficient channelizer architecture which supports wideband as well as narrowband channels with programmable channel bandwidth followed by frequency hopping for the proposed SATCOM system. The target design is a flexible channelization unit which divides the incoming data links of 11 MHz bandwidth into two data links in granularity of 0.5 MHz depending upon user requirements. First link is further sub-channelized into two sub-links each having a bandwidth of 25 KHz that is frequency hopped at a user programmable rate with desired random sequence. The same channelizer can be well applicablein any software defined radio receiver platforms due to flexibility of the design. Proposed design is tested on target hardware XilinxVirtex-IV FPGA xc4vsx35-10ff668. The design and implementation of the channelizer and frequency hopping technique arediscussed in detail.