mirror of
https://github.com/jhshi/openofdm.git
synced 2024-12-24 07:46:55 +00:00
226 lines
4.7 KiB
Python
Executable File
226 lines
4.7 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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Generate 802.11a/g/n Deinterleave LUT.
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Output compensate for pucntureing.
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"""
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import argparse
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import math
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import decode
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import os
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"""
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LUT ENTRY FORMAT
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1 bit -- null_a
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1 bit -- null_b
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6 bit -- addra
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6 bit -- addrb
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3 bit -- bita
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3 bit -- bitb
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1 bit -- out_stb
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1 bit -- done
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-------------------
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22 bits total
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LUT FORMAT
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+----------------+
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| BASE ADDR |
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| 32 ENTRY |
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+----------------+
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| 6 MBPS |
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+----------------+
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| 9 MBPS |
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+----------------+
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....
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+----------------+
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| MCS 0 |
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+----------------+
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...
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+----------------+
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| MCS 7 |
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+----------------+
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| PADDING |
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+----------------+
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"""
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RATE_BITS = {
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6: '1011',
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9: '1111',
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12: '1010',
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18: '1110',
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24: '1001',
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36: '1101',
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48: '1000',
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54: '1100',
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}
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RATES = [
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# (rate, mcs, ht)
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(6, 0, False),
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(9, 0, False),
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(12, 0, False),
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(18, 0, False),
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(24, 0, False),
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(36, 0, False),
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(48, 0, False),
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(54, 0, False),
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(0, 0, True),
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(0, 1, True),
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(0, 2, True),
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(0, 3, True),
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(0, 4, True),
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(0, 5, True),
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(0, 6, True),
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(0, 7, True),
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]
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def do_rate(rate=6, mcs=0, ht=False):
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idx_map = decode.Decoder(None).deinterleave(None, rate=rate, mcs=mcs, ht=ht)
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seq = [t[1] for t in idx_map]
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erase = '1/2'
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if ht:
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n_bpsc = decode.HT_MCS_PARAMETERS[mcs][0]
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if mcs in [2, 4, 6]:
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erase = '3/4'
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pass
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elif mcs == 5:
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erase = '2/3'
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pass
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elif mcs == 7:
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erase = '5/6'
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else:
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n_bpsc = decode.RATE_PARAMETERS[rate][0]
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if rate in [9, 18, 36, 54]:
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erase = '3/4'
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elif rate == 48:
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erase = '2/3'
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data = []
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i = 0
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puncture = 0
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while i < len(seq):
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addra = seq[i]/n_bpsc
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bita = seq[i]%n_bpsc
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if i+1 < len(seq):
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addrb = seq[i+1]/n_bpsc
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bitb = seq[i+1]%n_bpsc
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else:
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addrb = 0
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bitb = 0
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base = (addra<<14) + (addrb<<8) + (bita<<5) + (bitb<<2) + (1<<1)
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if erase == '1/2':
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mask = base
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data.append(mask)
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elif erase == '3/4':
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if puncture == 0:
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mask = base
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data.append(mask)
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puncture = 1
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else:
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mask = (1<<20) + base
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data.append(mask)
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mask = (1<<21) + base
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data.append(mask)
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puncture = 0
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elif erase == '2/3':
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if puncture == 0:
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mask = base
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data.append(mask)
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puncture = 1
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else:
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mask = (1<<20) + base
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data.append(mask)
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i -= 1
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puncture = 0
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elif erase == '5/6':
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if puncture == 0:
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mask = base
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data.append(mask)
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puncture = 1
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elif puncture == 1:
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mask = (1<<20) + base
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data.append(mask)
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mask = (1<<21) + base
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data.append(mask)
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puncture = 2
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else:
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mask = (1<<20) + base
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data.append(mask)
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mask = (1<<21) + base
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data.append(mask)
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puncture = 0
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i += 2
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# reset addra to NUM_SUBCARRIER/2
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if ht:
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mask = (26<<14) + 1
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else:
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mask = (24<<14) + 1
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data.append(mask)
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# sentinel
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data.extend([0]*4)
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return data
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('--out')
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args = parser.parse_args()
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if args.out is None:
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args.out = os.path.join(os.getcwd(), 'deinter_lut.mif')
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coe_out = '%s.coe' % (os.path.splitext(args.out)[0])
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header = [0]*32
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lut = []
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offset = 32
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for rate, mcs, ht in RATES:
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if ht:
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idx = (1<<4) + mcs
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else:
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idx = int(RATE_BITS[rate], 2)
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header[idx] = offset
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print '[rate=%d, mcs=%d] -> %d' % (rate, mcs, offset)
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data = do_rate(rate=rate, mcs=mcs, ht=ht)
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offset += len(data)
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lut.extend(data)
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total = int(2**math.ceil(math.log(offset, 2)))
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print 'Total row: %d (round up to %d)' % (offset, total)
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lut.extend([0]*(total-offset))
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with open(args.out, 'w') as f:
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for l in header + lut:
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f.write('{0:022b}\n'.format(l))
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print "MIL file saved as %s" % (args.out)
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with open(coe_out, 'w') as f:
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f.write('memory_initialization_radix=2;\n')
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f.write('memory_initialization_vector=\n')
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f.write(',\n'.join(['{0:022b}'.format(l) for l in header+lut]))
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f.write(';')
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print "COE file saved as %s" % (coe_out)
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if __name__ == '__main__':
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main()
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