Nt1310 Unit 3 Data Analysis

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The random data is encoded using the convolutional encoder and produce an output with 128 bits that contains not only this data but also additional redundant information that can be used to protect the data of interest in the event of errors during transmission. The 1/2 code rate is used in this encoder. For every 1 input bit, the convolution encoder outputs is 2 bits.
The encoded data is as shown in Figure 6.
Fig. 6. Encoded bits
V. TRANSMITTED DATA
The encoded bits is given to the interleaver for reducing the burst error. An interleaver is used to randomize the order of the code bits prior to transmission. This process is completely reversible and is simply mirrored in the receiver. The process of mapping binary code bits into channel symbols suitable for
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RECEIVED DATA
The transmitted signal travels to the receiver through several paths that may have different lengths and hence different associated time delays. There are so many scatters present in the transmitted signal.
VII. DECODED DATA
The received signal is then given to the OFDM demodulator.
The equalizer and de-interle-aver are performed on the demodulated signal and this signal is given to the decoder.
The number of iterations are followed at the receiver side.
The remarkable performance of turbo codes makes it clear that the soft information need not only flow in one direction.
Once the error control decoding algorithm processes the soft information it can, in turn, generate its own soft information indicating the relative likelihood of each of the transmitted bits. This soft information from the decoder could then be properly interleaved and taken into account in the equalization process, creating a feedback loop between the equalizer and decoder, through which each of the constituent algorithms communicates its beliefs about the relative likelihood that each given bit takes on a particular value. This process is often termed message passing Figure 7 shows the decoded bits. The
Fig. 7. Decoded