Differential Detection of Serially Concatenated Precoded GMSK with Iterative Decoding
碩士 === 國立高雄第一科技大學 === 電腦與通訊工程所 === 94 === Abstract In this thesis, differential detection for a serial concatenated coding system consists of an outer convolutional encoder, an interleaver and an inner rate-1 precoded Gaussian minimum-shift keying (GMSK) modulation is studied. Using differential pha...
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| Format: | Others |
| Language: | en_US |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/30305306764513687667 |
| Summary: | 碩士 === 國立高雄第一科技大學 === 電腦與通訊工程所 === 94 === Abstract
In this thesis, differential detection for a serial concatenated coding system consists of an outer convolutional encoder, an interleaver and an inner rate-1 precoded Gaussian minimum-shift keying (GMSK) modulation is studied. Using differential phase detector (DPD) combined with an iterative MAP (maximum a posteriori) decoding scheme is constructed to improve the system performance. It is shown that GMSK modulation with DPD results in a feedforward tapped delay line. Therefore, a rate-1 recursive precoder is employed in front of the GMSK to produce a combined inner MAP decoder with a trellis of four states only. Finally, numerical results are performed for AWGN and flat fading channels. It is shown that the proposed structure outperforms previous work about 2 dB in the AWGN channel and about 9 dB in the flat Rayleigh fading channel at BER is equal to 10-4 respectively.
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