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Bit interleaved coded modulation
1. Bit Interleaved Coded Modulation 1 Seminar on Signal Processing in Wireless Communications 2011 Bit Interleaved Coded Modulation Mridula Sharma February 28, 2011
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3. System Model: CM(Coded Modulation) and BICM (Bit Interleaved Coded Modulation)
21. number of bit-interleavers equals to the number of bits assigned to one non-binary codeword
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23. Disperse the burst errors and maximize the diversity order of the system
24. Uncorrelate the bits associated with the given transmitted symbolm-bits define a symbol Due to the interleaving the input bits to the mapper are approx. independent
25. 6 Seminar on Signal Processing in Wireless Communications 2011 Bit Interleaved Coded Modulation Introduction Binary to M-ary mapping Binary Encoder Bitwise Interleaver M-ary- modulator Complex flat-fading AWGN Soft-In Binary Decoder LLR Bit Metric Calculation Receiver front end Bitwise Deinterleaver Fig : BICM Overview The combination of binary encoding, bitwise interleaving, and M-ary modulation actually yields better performance in fading than symbol-wise interleaving and trellis-coded modulation (Caire 1998)
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27. A binary map µ= {0, 1} m χis a Gray labeling for χ if for all i= 1……..m and bϵ {0, 1}, each x ϵχ bi has at most one z ϵχ bi at distance dminFig : 16QAM Symbol arrangement chart with Gray labeling
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29. Main Function: to produce an equivalent channel that has ʋ parallel, independent, memoryless binary channels
33. Errors for bit a1 can easily occur, because adjacent symbols of 8PSK will necessarily have different a1s
34. If a1 is assumed to be correct, then a2 changes every other symbol of 8PSK and a symbol distance the same as that of QPSK will be obtained
35. If a1 and a2 are assumed to be correct, then a3 can be determined if a decision can be made as to which diagonal symbol has been received, and a symbol distance the same as that of BPSK will be obtainedFig : 16QAM Symbol arrangement chart with Set Partitioning
54. 18 Seminar on Signal Processing in Wireless Communications 2011 Bit Interleaved Coded Modulation Coded Modulation Fig : Performance of coded modulation using convolutional code
55. 19 Seminar on Signal Processing in Wireless Communications 2011 Bit Interleaved Coded Modulation Bit Interleaved Coded Modulation Binary Code Ĉ ENC μ π χ Channel
77. 34 Seminar on Signal Processing in Wireless Communications 2011 Bit Interleaved Coded Modulation Fig: BICM and CM cutoff rate versus SNR for QAM signal sets with Gray (or quasi-Gray) labeling over Rayleigh fading with coherent detection and perfect CSI
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79. No CSI: Choose χ to be N-ary orthogonal (N = 2m).Eg. Hadamard sequences.