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參數資料
| 型號： | W9310 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 通信及網絡 |
| 英文描述： | Direct Sequence Spread Spectrum Transceiver(直接序列擴展頻譜收發器) |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP80 |
| 封裝： | PLASTIC, QFP-80 |
| 文件頁數： | 35/36頁 |
| 文件大小： | 220K |
| 代理商： | W9310 |
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W9310
Publication Release Date: July 1996
- 35 -
Revision A3
where L is the length of the sequence, 0
≤
N
≤
L, and bi
=
bi+22 for i < 0. As before, the desired
cross-correlation property is that the maximum value of the cross-correlation R
N
is less than L - 2
×
T,
where L and T are as defined previously.
Requirements for choosing good UWs can be thus summarized by the following equations:
S
L
2
×
R
L
2
T
×
T
N
<
N
<
(9)
For example, when T is programmed to be 4, S
N
and R
N
should be less than 14, since L is 22.
Generating the PN and UW Sequences
There are many ways of generating the PN and UW sequences, including a brute-force search of the
complete code space. A more efficient but probably suboptimal way of generating the PN and UW
sequences is to perform the following steps:
1. Generate the M and Gold sequences of order N, where
N
log L
=
(10)
and where L is the length of the PN or UW sequence.
2. Because M and Gold sequences are only 2
N
- 1 bits long, it is necessary to append an additional
bit to these sequences so that they are 2
N
bits long. The additional bit should be chosen such that
the modified M or Gold sequence is even.
3. Apply the criteria outlined in the previous sections to pick out a good set of PN and UW
sequences.
Some Examples of PN and UW Sequences
NO.
PNA
PNB
PNC
PND
1
9A42BB1E
1F348576
763E690A
0AEC7CD2
2
8DD4259E
9F1BA84A
4B3E3750
50967C6E
3
B8AD0C9E
9F715A18
193EE2B4
B4327DC4
4
B386A45E
5F670D48
48BECE1A
1A917D9C
NO.
UW
NO.
UW
NO.
UW
NO.
UW
1
96C55C
6
9D85BC
11
996E7C
16
9707B4
2
987ABC
7
9C2F34
12
9723DC
17
99A0F4
3
9E875C
8
993CF4
13
9817AC
18
9CC97C
4
98A17C
9
998794
14
9C53F4
19
98D3E4
5
9A83EC
10
9A887C
15
9E42F4
20
983EB4
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