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Extra resources for Drake SSR-1 Communications Receiver
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The basic principle of equalization is to pass the received signal through a filter with a properly designed response. 12 shows an example of a commonly used equalizer structure that consists of a linear non-recursive N-tap filter. The coefficient connected with each tap is determined through an adaptive processing such that the desired performance objective is achieved based on the channel estimation helped by a training sequence. Ideally, ISI would be eliminated if the frequency response of the equalizer is made equal to the inverse of that of the channel.
On the other hand, if the coherence bandwidth is large, all the frequency components of the transmitted signal experience the same channel state. In this case, the channel seen by the receiver is flat in the frequency domain, so we call this case the frequencyflat fading channel. 35); that is, the channel has zero delay spread. As noted above, the frequency selectivity of the channel distorts the transmitted signals as illustrated below. , Ts ¼ 1/B < TM). Thus, in a frequency-selective fading channel, a new symbol is transmitted into the channel before the previously transmitted symbol finishes its arrival at the receiver.
6 ms. The frame format for this MCS provides 24 576 modulation symbols and 1024 information bits are mapped into the provided symbol space as follows. A channel coding with the rate of 1/5 renders 1024 Â 5 ¼ 5120 bits and the QPSK modulation makes 5120/2 ¼ 2560 symbols. The whole 2560 symbols are repeated nine times and 1536 symbols among them are repeated once more. 6. So we finally get (2560 Â 9) þ 1536 ¼ 24 576 modulation symbols which match with the provided frame format. 5). 1: Physical Layer Aspects for Evolved UTRA.