| 单词 | Barker code |
| 释义 | Barker code A coding scheme used in direct sequence spread spectrum (DSSS) radio systems. Barker code is a sequence of N values of +1 and –1, with N equaling 2, 3, 4, 5, 7, 11, or 13 bits. IEEE 802.11b wireless LANs (WLANs) operating at 1 Mbps and 2 Mbps use an 11-bit Barker code, 10110111000.The code has certain mathematical properties that make it ideal for modulating radio waves. The basic data stream is subjected to a swap algorithm with the Barker code to generate a series of data objects called chips. Each bit is encoded by the 11-bit Barker code, with each group of 11 chips encoding one bit of 74570c02.qxd 9/11/07 12:18 PM Page 54 |
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