simulyts-lekts.zip - Soft Decision Bits
The aim of an Equalizer is to estimate the transmitted symbols at the receiver stage, which is more specifically to decide each bit in the symbol being a „ 0‟ or „ 1‟ . A decision formed in a binary way of either 0 or 1 is called a hard decision. Hard decision decoding takes a stream of bits from the threshold detector stage of a receiver, where each bit is considered definitely either „ 1‟ or „ 0‟ . For binary signaling, received pulses are sampled at time intervals ts = nT, and the resulting voltages are compared with a single threshold. If a voltage is greater than the threshold it is considered to be definitely a 1 say regardless of how close it is to the threshold. If it is less, it is definitely a „ 0‟ . This is equal to making a 100 positive decision of a certain bit.,2013-05-29 13:10:27,下载3次
mergejliin-dadlaga-zurag.rar - In this transmission system, the input signal bits are first mapped into complex-valued
symbols {sn}, according to its modulation type. The in-phase and quadrature components of
the symbol will be multiplied with the high frequency carrier and be transmitted over the
additive white Gaussian noise (AWGN) channel. On the demodulator side, the received
signal is demodulated with correct carrier phase into its in-phase and quadrature components,
and sampled with the correct timing intervals, ts=nT. The equalizer can be considered as a
part of the demodulator. The input to the equalizer is the {rn} sequence, which represents the
complex-valued symbols with ISI distortion, and the output is the soft decision result, which
is the probability of each received bit being „ 1‟ or „ 0‟ .,2013-05-29 13:02:29,下载1次
Diplomstandard2011.rar - In general Equalization is the process of changing the frequency envelope of a sound in audio processing. Passing through any channel, an audio signal will "spread" from its original qualities. The goal of equalization is to compensate for frequency distortions in the signal. The term "equalizer" is often incorrectly applied to audio filters, such as those included on DJ mixing equipment and hi-fi audio components. However, these "equalizers" are typically general purpose audio filters, which can be arranged to produce the effect of low pass, high pass, band pass and band stop filters. Such filters are true equalizers only when arranged to reverse the effects of internal circuitry on sound output [30].,2013-05-29 12:50:46,下载10次
J.RC306-Lab-zaavar.zip - large.
The second technique is the time–frequency domain equalization with channel shortening [29]. A time-domain equalizer is inserted to reduce the MIMO channels to the ones with the channel length shorter than or equal to the CP length, and then, a one-tap frequency-domain equalizer is applied to each subcarrier. When the MIMO channels are shortened by the time-domain equalizer, residual ICI and ISI are introduced. They cannot be eliminated by the subsequent frequency-domain equalizer and, thus, limit the performance.,2013-05-29 12:30:54,下载2次