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Cascaded Integrated Comb (CIC) filters are mainly used as low pass filter in rate converter module in a multi rate signal processing based systems. Hardware implementation of CIC filter is very efficient as it does not require any multiplier and uses very less memory. The paper presents the FPGA implementation of modified Cascaded Integrated Comb (CIC) filter for satellite communication system. The...
In a satellite, there exist various communication subsystem like Telecommand, Telemetry and Payload data transfer. Depending on the requirements of a particular system, different modulation techniques are being used. In general, M-PSK modulation techniques are preferable as they are power and bandwidth efficient. The paper presents the digital implementation QPSK & 8-PSK modulators for satellite...
The paper presents design and development of Wireless Telecommand (TC) and Telemetry (TM) subsystems for satellite. The Low Rate Wireless Personal Area Network (LR-WPAN) IEEE 802.15.4/ZigBee standard is used for wireless command distribution and acquisition of health parameters from different subsystems in a spacecraft. The wireless TC system is designed to operate 100 Bps, and wireless TM system...
CORDIC stands for crdinate rotation digital computer, is an algorithm developed to compute trigonometric function through series of rotation. Para-CORDIC is the latest method of implementation of CORDIC equations and has an advantage over other implementation algorithm in terms of speed and accuracy. This paper presents the implementation of para-CORDIC algorithm and its applications in satellite...
The paper presents hardware efficient design of digital signal processing (DSP) based bit synchronizer and lock detector circuit for bi-phase data. The system is developed for one of the payload of Chandrayaan-I mission, and tested for its performance. Apart from the implementation, paper describes the mathematical modeling of bit synchronizer. The whole design is accommodated in a single Actel-1280...
Wireless links are impaired by random fluctuations in signal level across space, time and frequency known as fading. Spatial diversity is an attractive solution to improve system capacity as well as system performance by providing array gain or increased SNR. Satellites (GEO,MEO) and High Altitude platform stations(HAPS) also exploit spatial diversity in LOS/NLOS envirornment. Exact nature of the...
The choice of filter structure for any system depends on the various parameters like computational complexity, memory requirement, frequency of operation and finite world length effect. To overcome the limitations of Infinite Impulse Response (IIR) filter, an Interpolated Finite Impulse Filter (IFIR) has been designed and implemented in Xilinx FPGA. The paper deals with issues related to the hardware...
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