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Cognitive Radios are secondary radio systems which can use the vacant bands of a Primary radio for communication. Cognitive radios are reconfigurable radios with signal processing and Machine learning capabilities. The spectrum usage is controlled by different spectrum regulatory authorities and agencies. Majority of the agencies are following a static spectrum allocation technique and CRs are looking...
The Manet or Mobile Ad-Hoc Networks are capable of forming wireless networks with different topologies. The radios which form the network uses a specific band, data rate and frequency. The paper focuses on the implementation of intelligent Mobile Ad-hoc NETwork (iMANET) in which wireless networks are established using reconfigurable radios so that intelligent networks can be formed. The nodes involved...
The Cognitive radios are intelligent Software Defined radios which is aware of its environment by scanning and identifying spectrum holes. The knowledge of the modulation scheme of the received signal is significant to judge the channel and configure the SDR to transmit and receive. The two broad fields of modulation recognition are pattern recognition and decision theoretic approaches. This paper...
Manet or Mobile Ad-Hoc Networks are self-forming networks which does not require a fixed infrastructure for its communication. Manet plays a critical role in Military Communication and Disaster Management system. Initially there will be multiple nodes with separate address assigned from an address pool, which will form the network when needed. Worm-hole attack and black-hole attack are the severe...
Reconfigurable technology plays a critical role in the development of Next-generation wireless communication systems. OFDM is wireless communication technique in which digital data is encoded in large number of closely spaced orthogonal sub-carrier signals. The paper discusses the Baseband FPGA implementation of an OFDM transmitter. The module is implemented using a technique called partial reconfiguration...
FPGAs play an important role in the implementation of modern communication systems like Cognitive radios (CR). The CRs are designed to run multiple waveforms based on environment sensing. The waveforms can be multicarrier and can have wider bandwidths and high data rate. The radio platform will be loaded with multiple executable files depending on the waveforms which will use different source coding,...
FPGAs are playing a very significant role in software defined Radios (SDR) and Cognitive radios (CR). The SDRs and CRs are capable of running different waveforms which may use different modulation techniques, source coding and channel coding. These reconfigurable radios have to load the waveforms into the FPGA based on their requirements without interrupting the system. The user has to load large...
The nonlinearity of a Power amplifier creates spectral growth beyond a specific bandwidth which interferes with adjacent channels. This nonlinearity also causes in-band distortion which will affect the Bit error rate performance, so Linearization of power amplifiers is very essential for reliable transmission. Digital Pre-distortion (DPD) is a linearization technique which will negate the non-linear...
Frequency-hopping is a method by which the carrier of a transmitting radio signal will rapidly switch among many frequency channels, using a pseudorandom sequence known to both transmitter and receiver. This rapid switching of the carrier frequencies during transmission will minimize the unauthorized interception or jamming of telecommunications. Any radio with a digitally controllable frequency synthesizer...
The role of FPGAs in software defined Radios (SDR) and Cognitive radios (CR) are very significant. These radios have to load different waveform depending on their requirements which may use different source coding, channel coding and modulation schemes. The user has to load large bit files even for small changes in the waveforms. In SDRs and CRs the configuration time and current consumption plays...
The role of FPGAs in software defined Radios (SDR) and Cognitive radios (CR) are very significant. These radios have to load different waveform depending on their requirements which may use different source coding, channel coding and modulation schemes. The user has to load large bit files even for small changes in the waveforms. In SDRs and CRs the configuration time and power consumption plays significant...
The OFDM module in the MB-OFDM UWB transmitter is necessarily operated at 528 MHz. This is really a challenging task because the OFDM in the UWB module has to calculate 128-point IFFT. Earlier papers used radix-24 SDF algorithm with parallel processing architectures of block size two to achieve the required speed and implemented the module on ASIC. In this paper a novel scheme ldquomodified radix-2...
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