Two encoding and decoding approaches to increase the IEEE 802.11b WLAN physical layer data rate to 16.5 Mbps are proposed. Based on the constraint that the payload modulation should continue to employ the complementary code keying (CCK) codes employed by IEEE 802.11b for the 5.5 and 11 Mbps rates, the proposed encoding processes are changed in minor ways. The first proposal still keeps on using the same Fast Walsh Transform (FWT) as used in the decoding process for 5.5 and 11 Mbps data rates. The FWT of the second proposal has been modified to adapt the increased data rates of 16.5 Mbps. Finally, the performance of both proposals in AWGN channel without multi-path interference has been simulated to demonstrate the advantage of the 2nd proposal over the 1st one.%本文提出两种将IEEE802.11b WLAN 物理层数据速率提高到16.5Mbps的编码和译码方法.这两个方案都继续采用原IEEE802.11b中对于5.5和11Mbps速率所采用的CCK编码方法.两个方案的编码过程变化不大,第一方案的译码还是采用对5.5和11Mbps数据率所使用的快速WALSH变换(FWT),第二个方案的译码被修改成适合于16.5Mbps数据率的快速WALSH变换(FWT).最后通过仿真比较了这两个方案在无多径干扰的AWGN信道上的性能,结果表明第二个方案优于第一个.
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