A real-time simulation tool called BERSIM is developed and used to study bit-by-bit errors, average bit error rate and block outage probabilities for Tt/4 DQPSK at megabit rates with raised-cosine pulse shaping. Simulation results show that when the ratio of nns delay spread to bit duration is greater than about 0.02, the irreducible average BER is not only a function of rms delay spread, but i...

We have implemented a modem for digital storage onto standard audio tape. The primary goal of this project was to get a prototype system to function with very low probability of bit error. The prototype system is \soft" in that it is all done within Ptolemy except D/A and A/D conversion and, of course, recording is done on a cassette deck. The transmitter takes an input bit stream and modulates...

In this paper we intend to present IEEE-754 format and comparison of Cosine Trigonometric functions used in Discrete Cosine Transform (DCT) in terms of hardware design. Here we find the cosine value by C language and Hardware Description Language (HDL) and checking the error for DCT.

Pulse shaping of a signal at base-band forms a more important tool in controlling and analyzing the parameters like ISI, the modulated signal envelope uniformity, the phase continuity as these parameters lead to the efficient spectral confinement of a binary signal which is a future and nowadays a major important aspect in the design of a wireless cellular communication system. In this paper, d...

Single Carrier Frequency Division Multiple Access (SC-FDMA) is proposed for uplink transmission of Long Term Evolution Advanced (LTE-A) due to its lower Peak to Average Power Ratio (PAPR) compared to Orthogonal Frequency Division Multiple Access (OFDMA). In this paper, a comparison is introduced between its two subcarrier mapping schemes, Localized-FDMA (LFDMA) and Interleaved-FDMA (IFDMA), in ...

We experimentally demonstrate improved intra-channel nonlinearity tolerance of the root M-shaped pulse (RMP) with respect to the root raised cosine (RRC) pulse in spectrally efficient 128 Gbit/s PDM-16QAM coherent transmission systems. In addition we evaluate the impact of dispersion map and fiber dispersion parameter on the intra-channel nonlinearity tolerance of the RRC pulse and the RMP via ...

In this paper we present and analyze a method for channel SNR (Signal to Noise Ratio) estimation for M-PSK, which is based upon the exploitation of the statistics of a symbol synchronization lock metric. The analysis pertains to AWGN (Additive White Gaussian Noise) channels in systems whose baseband pulse shape is Square-Root Raised Cosine (SRRC) or rectangular. It is shown that, in terms of la...

Adaptive muting method using an optimized parametric shaping function as a part of the ITU-T G.722 Appendix IV packet loss concealment algorithm is proposed. The packet loss concealment algorithm incorporating an adaptive muting scheme is known to prevent the generation of unpleasant sounds during packet loss concealment. However, original muting uses a piece-wise linear muting curve according ...

Pulse shaping of a signal at base-band forms a more important tool in controlling and analyzing the parameters like ISI, the modulated signal envelope uniformity, the phase continuity as these parameters lead to the efficient spectral confinement of a binary signal which is a future and nowadays a major important aspect in the design of a wireless cellular communication system. In this paper, d...

In this paper, effects of the different apodization and chirp functions in one-dimensional nonlinear Bragg grating on switching characteristics are studied. It is shown that with increasing the Gaussian width in the case of Gaussian apodization, slope of transfer function is increased. The situation is same in the case of raised cosine apodization function too. Also, in the case of quadratic ap...