A Proposed Scrambling Vector for the CCK Blockcode

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Presentation transcript:

A Proposed Scrambling Vector for the CCK Blockcode doc.: IEEE 802.11-98/303 September 1998 September 16, 1998 A Proposed Scrambling Vector for the CCK Blockcode Chris Heegard, Matthew Shoemake & Stan Ling Alantro Chris Heegard, Alantro

CCK code (n=8, k=4) Z4 c = mG (over Z4) d = 4 September 16, 1998 CCK code (n=8, k=4) Z4 G = [1 1 1 1 1 1 1 1] [1 1 1 1 0 0 0 0] [1 1 0 0 1 1 0 0] [1 0 1 0 1 0 1 0] c = mG (over Z4) A linear code (mG) d = 4 Number of Nearest Neighbors = 24 Alantro

CCK Scrambling c = b.*mG + a Q: Which choice of a & b is best? September 16, 1998 CCK Scrambling c = b.*mG + a bi in {-1, +1} ai in {0, 1, 2, 3} Q: Which choice of a & b is best? First proposal: b = [+1 +1 +1 +1 +1 +1 +1 +1] a = [ 0 0 0 2 0 0 2 0] New proposal: b = [-1 -1 -1 -1 +1 +1 +1 +1] a = [ 1 0 3 0 0 2 3 3] Alantro

100ns Delay Spread September 16, 1998 Alantro -2 -1.5 -1 -0.5 0.5 1 0.5 1 1.5 2 50 100 150 200 250 Trms: 100 Number of Channels: 1000 0 0 0 2 0 0 2 0 versus 5 4 7 4 0 2 3 3 Alantro

100ns Delay Spread September 16, 1998 Alantro 100 200 300 400 500 600 100 200 300 400 500 600 700 800 900 1000 -2.5 -2 -1.5 -1 -0.5 0.5 Trms: 100 Number of Channels: 1000 0 0 0 2 0 0 2 0 versus 5 4 7 4 0 2 3 3 Alantro

200ns Delay Spread September 16, 1998 Alantro -2 -1.5 -1 -0.5 0.5 1 0.5 1 1.5 2 50 100 150 200 250 Trms: 200 Number of Channels: 1000 0 0 0 2 0 0 2 0 versus 5 4 7 4 0 2 3 3 Alantro

200ns Delay Spread September 16, 1998 Alantro 100 200 300 400 500 600 100 200 300 400 500 600 700 800 900 1000 -3 -2.5 -2 -1.5 -1 -0.5 0.5 1 Trms: 200 Number of Channels: 1000 0 0 0 2 0 0 2 0 versus 5 4 7 4 0 2 3 3 Alantro

Key Points A “flexible” component of Harris/Lucent Proposal September 16, 1998 Key Points A “flexible” component of Harris/Lucent Proposal Study of best solution was solicited in July meeting The New Solution has more robust multipath tolerance No Hardware Cost The CCK decoder structure (e.g., FFT method) is independent of choice of scramble vector Rotational Invariance “Differential” precoding of 2 bits per codeword is maintained Alantro