In this paper, a comparative investigation of different random modulation schemes against the normal pulsewidth modulation (PWM) for the DC motor drive with step-down chopper (buck) and half-bridge configuration is presented. For this purpose, an experimental setup with DSP2 board has been developed. The board consists of the signal processor TMS320C32 which is suitable for verifying the differ...

In this paper, we propose two novel modulation concepts based on a simple maximum distance separable (MDS) code and show that these can achieve better error performance than index (IM) related schemes. the first concept, use amplitude phase levels to form MDS code, whereas, in second one, in-phase quadrature components of codeword elements are used construct code. We depict practical schemes fo...

Amplitude modulation (AM) and frequency modulation (FM) in speech signals are believed to reflect various non-linear phenomena during the speech production process. In this paper, the amplitude and frequency modulation patterns are analyzed for the first three speech resonances in relation to the fundamental frequency (F0). The formant tracks are estimated, and the resonant signals are extracte...

In this letter, a novel supplementary index bit aided transmit diversity (SIB-TD) approach is proposed for an enhanced discrete cosine transform based orthogonal frequency division multiplexing with modulation (EDCT-OFDM-IM) system. Specifically, conventional (IM) employed the first antenna, i.e., main branch, and non-activated subcarriers’ indices in one group are utilized IM mapping on same s...