JPH0226841U - - Google Patents
Info
- Publication number
- JPH0226841U JPH0226841U JP10555288U JP10555288U JPH0226841U JP H0226841 U JPH0226841 U JP H0226841U JP 10555288 U JP10555288 U JP 10555288U JP 10555288 U JP10555288 U JP 10555288U JP H0226841 U JPH0226841 U JP H0226841U
- Authority
- JP
- Japan
- Prior art keywords
- output
- matched filter
- spread spectrum
- filter
- noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001228 spectrum Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims 2
- 230000001360 synchronised effect Effects 0.000 claims 2
- 230000003111 delayed effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図はこの考案の一実施例によるスペクトル
拡散通信用復調器を示すブロツク図、第２図はこ
の考案の他の実施例を示すブロツク図、第３図は
従来のスペクトル拡散通信用復調器を示すブロツ
ク図である。
図において、１は入力端子、２はマルチプライ
ヤ、３は９０°位相器、５ａ，５ｂはローパスフ
イルタ、６ａ，６ｂはＡ／Ｄコンバータ、７ａ，
７ｂはデイジタル相関器、８ａ，８ｂは２乗回路
、９は加算器、１０は相関最大位相検出器、１１
はコード追尾ループ、２０は出力端子、４１はデ
イレイライン、４２はモジユロ２加算器、４３は
マルチプライヤ、４４は位相検波器、４５はルー
プフイルタ、４６はＶＣＯ、４７，５２は９０°
位相器、５１は逆変換器、５３，５４はＩおよび
Ｑチヤネル入力端子を示す。なお、図中、同一符
号は同一、または相当部分を示す。
Fig. 1 is a block diagram showing a demodulator for spread spectrum communication according to one embodiment of this invention, Fig. 2 is a block diagram showing another embodiment of this invention, and Fig. 3 is a conventional demodulator for spread spectrum communication. FIG. In the figure, 1 is an input terminal, 2 is a multiplier, 3 is a 90° phase shifter, 5a, 5b are low-pass filters, 6a, 6b are A/D converters, 7a,
7b is a digital correlator, 8a and 8b are square circuits, 9 is an adder, 10 is a correlation maximum phase detector, 11
is a code tracking loop, 20 is an output terminal, 41 is a delay line, 42 is a modulo 2 adder, 43 is a multiplier, 44 is a phase detector, 45 is a loop filter, 46 is a VCO, 47 and 52 are 90°
51 is an inverter, and 53 and 54 are I and Q channel input terminals. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
スペクトル拡散波を同期検波する同期検波手段と
、この同期検波手段に接続し高周波成分を除去す
るローパスフイルタと、このローパスフイルタに
接続するマツチドフイルタと、このマツチドフイ
ルタの出力に接続し受信側で再生されたＰＮコー
ドとマツチドフイルタ出力の極性により送信側ベ
ースバンド信号と同等の信号を発生する発生手段
と、この発生手段の出力で一定時間遅延された前
記受信スペクトル拡散波に対し逆変調をかける逆
変調手段と、この逆変調手段に現われる再生搬送
波中の雑音を制限する為の雑音制限手段とを備え
、前記マツチドフイルタの出力の極性を復調デー
タとしたことを特徴とするスペクトル拡散通信用
復調器。 A synchronous detection means for synchronously detecting a received spread spectrum wave using an output regenerated carrier wave of the noise control means to be described later, a low-pass filter connected to this synchronous detection means and for removing high frequency components, a matched filter connected to this low-pass filter, and a matched filter of this matched filter. generating means connected to the output and generating a signal equivalent to the transmitting baseband signal based on the polarity of the PN code regenerated on the receiving side and the matched filter output; and the received spread spectrum wave delayed for a certain period of time by the output of this generating means. and noise limiting means for limiting noise in the reproduced carrier wave appearing in the inverse modulating means, and the polarity of the output of the mated filter is used as demodulated data. Demodulator for spread spectrum communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10555288U JPH0226841U (en) | 1988-08-09 | 1988-08-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10555288U JPH0226841U (en) | 1988-08-09 | 1988-08-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0226841U true JPH0226841U (en) | 1990-02-21 |
Family
ID=31338269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10555288U Pending JPH0226841U (en) | 1988-08-09 | 1988-08-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0226841U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04269682A (en) * | 1990-11-28 | 1992-09-25 | Novatel Commun Ltd | Multichannel digital receiver for global position detecting system |
-
1988
- 1988-08-09 JP JP10555288U patent/JPH0226841U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04269682A (en) * | 1990-11-28 | 1992-09-25 | Novatel Commun Ltd | Multichannel digital receiver for global position detecting system |
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