1. LB84 PHY Ad-hoc Comment Resolution CID# 690
June 2006
doc.: IEEE /0851r0
June 2006
LB84 PHY Ad-hoc Comment Resolution CID# 690
Date:
Authors:
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Jeremy Gosteau
Jeremy Gosteau

2. Advanced space-time coding
June 2006
doc.: IEEE /0851r0
June 2006
Advanced space-time coding
CID #690
There is one value of the STBC field in the HT-SIG field that is never used which provides the possibility of adding an optional more advanced STBC code for better range and throughput efficiency.
Provide a new optional advanced STBC code
When NSTS = 2, only full diversity (NSS = 1) or only full rate (NSS = 2) modes can be applied.
Proposal: define a set of optional robust transmission rates that are applicable when NSS = 2 and NSTS = 2 with minimum change in Tx chain
Selection of the Golden code: full rate full diversity code with non vanishing determinant, that is implemented as an additional STBC
Jeremy Gosteau
Jeremy Gosteau

3. June 2006
doc.: IEEE /0851r0
June 2006
The Golden code
Construction of the Golden code [1] from a cyclic division algebra:
The Golden code achieves the diversity/multiplexing gain tradeoff with minimal code length and non vanishing determinant:
good candidate to achieve high data rates
[1] J.-C. Belfiore, G. Rekaya, and E. Viterbo, "The Golden Code: A 2 x 2 Full-Rate Space-Time Code with Non-Vanishing Determinants", IEEE Transactions on Information Theory, vol. 51, April 2005.
Jeremy Gosteau
Jeremy Gosteau

4. Simulation results for Rayleigh channel
June 2006
Comparison of Golden code and dual stream transmission for 2Tx/2Rx:
Small gain observed for .11n convolutional code
1.3dB gain provided by the Golden code when concatenated to the less robust [5 7] convolutional code
1.3dB
Jeremy Gosteau

5. Uncoded and coded simulation results for channel TGn D
June 2006
Uncoded and coded simulation results for channel TGn D
Simulation results for 2x2, QPSK, 20MHz bandwidth
6.8dB gain at PER = 10-2 on uncoded performance using the Golden code
But close performance for both Tx schemes in the coded case (R = ½)
6.8dB
Coded case
Uncoded case
Simulation parameters for TGn channels:
.11n stream parser, interleaver and constellation mapper
Maximum Likelihood detection
Jeremy Gosteau

6. Simulation results for channels Tgn B-D
June 2006
Both schemes give close performance for higher data rate (MCS: 12, 78Mbps) in office environment (TGn D)
But a small gain (0.3dB) is provided by the Golden code in home environment (TGn B) with less frequency diversity
0.3dB
Jeremy Gosteau

7. June 2006
Conclusion
No significant gain on the performance of .11n modes by implementing the Golden code with the constraint to only upgrade the STBC block of .11n Tx chain
However a gain could be provided by the Golden code by adapting other Tx blocks such as the interleaver and the mapper
To avoid significant change in the current draft, proposed resolution for CID #690  Withdraw
Jeremy Gosteau