Prasad Yaddanapudi

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—In this letter we present a new method for mitigating narrowband interference in orthogonal frequency-division multiplexing-based ultra-wideband communication systems. The proposed narowband interference avoidance (NBIA) method performs spectral shaping of the transmitted signal using binary signature sequences with minimum total squared correlation (TSC)(More)
— In this paper we present a new method for mitigating narrowband interference in OFDM-based ultrawide band (UWB) communication systems. This is based on spectral shaping of the transmitted signal using binary signature sequences with minimum total squared correlation (TSC) to avoid the narrow-band interfering signal. When spectral shaping is employed, the(More)
— In our paper we present a comparison between multiband time-hopping impulse radio and multiband OFDM ultra wideband (UWB) systems. For the time-hopping impulse radio we consider the multiband time-hopping pulse amplitude modulation UWB system that uses Hadamard sequences to distribute power of a single information bit to all the available sub-bands. In(More)
—In this paper we discuss exploiting multiuser diversity and adaptive modulation in conjunction with spectral load smoothing (SLS) as a medium access control protocol for spectrum agile radios (SAR) in a multiuser OFDM/OFDMA based wireless communication system operating in frequency selective fading channel. The ability of the spectrum agile radios to(More)
— In this paper we present a new method for mitigating narrowband interference in multiband OFDM (MB-OFDM) ultra wideband (UWB) systems. The method employs spectral shaping of the transmitted signal using binary signature sequences with minimum total squared correlation (TSC) to avoid the narrowband interfering signal. We illustrate the proposed method with(More)
—In this paper we present a side-by-side comparison between time-hopping (TH) impulse radios (IR) based on pulse amplitude modulation (PAM) and interference suppressing (IS) OFDM-based ultra wideband (UWB) systems in multiuser scenarios. For both systems we use minimum mean squared error (MMSE) receivers, and look at the raw bit error rate (BER) at the(More)
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