假设CDMA发送方在连续两个时隙发出的编码为+1+1+1-1+1-1-1-1-1-1-1+1-1+1+1+1.发送方码片序列为+1+1+1-1+1-1-1-1.则接收方解码后的数据应为()
- A.01
- B.10
- C.00
- D.11
正确答案及解析
正确答案
解析
（超纲）考察的是码分复用，8bit码片，根据两个时隙发出的编码分别是16bit，两个码片：
1、将收到的码片序列分别和已知站的码片序列内积；
2、将内积结果÷8；3、若结果为 1，表示源站发送比特 1；若结果为 -1，表示源站发送比特 0；若结果为 0 ，表示源站没有发送；所以[(+1,+1,+1,-1,+1,-1,-,1,-1)*(+1,+1,+1,-1,+1,-1,-1,-1)]/8=8/8=1;[(+1,+1,+1,-1,+1,-1,-,1,-1)*(-1,-1,-1,+1,-1,+1,+1,+1)]/8=-8/8=-1;所以解码后的数据是10。
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