Wired spread spectrum communication device, a method for communication thereof, and a wired spread spectrum communication system

• US 20030169805A1
• Filed: 02/28/2003
• Published: 09/11/2003
• Est. Priority Date: 03/08/2002
• Status: Active Grant

• Current Assignee: Ibiden Industries Co., Ltd. (Ibiden Co., Ltd.)
• Original Assignee: Ibiden Industries Co., Ltd. (Ibiden Co., Ltd.)
• Inventors: Sasaki, Shigenobu, Kawashima, Mitsusato
• Granted Patent: US 7,684,466 B2
• Time in Patent Office: Days
• US Class Current: 375/146
• CPC Class Codes: H04B 1/7075 with code phase acquisition
• CPC Class Codes: H04B 3/00 Line transmission systems combined with near-field transmission systems H04B5/00
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713

Abstract

It is an object to provide a wired spread spectrum communication device, a method for communication thereof and a wired spread spectrum communication system capable of enabling easy establishment of synchronism, and as a means for solution, in a transmitter unit of the wired spread spectrum communication device, a spreading code generator generates spread spectrum signals that are based on specified spreading codes, a strobe signal generator and a timing gate output the spread spectrum signals as sync signals S at specified timings, and an adder superposes the sync signals to the spread information signals, while the adder further sends the information signals that have been superposed with the sync signals as transmitting signals to transmission paths; radical correlation peaks may be obtained at specified timings upon obtaining, on a receiving side of the information signals, correlations between the information signals and the specified spreading codes, since the sync signals that have been superposed to the information signals are spread spectrum signals that appear at specified timings.

Claims

1. A wired spread spectrum communication device which sends information signals that have been spread by spreading codes to transmission paths, the wired spread spectrum communication device comprising

a spread spectrum signal generating means which generates spread spectrum signals on the basis of specified spreading codes,

a sync signal generating means which outputs the spread spectrum signals that have been generated by the spread spectrum signal generating means at specified timings as sync signals,

a superposing means which superposes the sync signals that have been output from the sync signal generating means to the information signals, and

a transmitting means which sends the information signals, which have been superposed with the sync signals by the superposing means, to the transmission paths.

2. The wired spread spectrum communication device as claimed in claim 1, wherein the specified timings are arbitrary timings for superposing one or more sync signals within a single cycle of the spreading codes for spreading the information signals or one sync signal to a plurality of cycles.

3. The wired spread spectrum communication device as claimed in claim 1, wherein the spread spectrum signals are square waves of the specified spreading codes or are generated by multiplying the specified spreading codes with sine wave signals.

4. The wired spread spectrum communication device as claimed in claim 2, wherein the spread spectrum signals are square waves of the specified spreading codes or are generated by multiplying the specified spreading codes with sine wave signals.

5. A wired spread spectrum communication device which receives received signals including information signals that have been spread by spreading codes from transmission paths, the wired spread spectrum communication device comprising

a correlator means which obtains correlations between the received signals that have been received from the transmission paths and specified spreading codes owned by sync signals that have been superposed to the received signals and extracting the sync signals,

a back-spreading code generating means which generates back-spread spectrum signals that are capable of demodulating information signals on the basis of the sync signals that have been extracted by the correlator means, and

a demodulator means which performs back-spread of the received signals on the basis of the back-spread spectrum signal codes as generated by the back-spreading code generating means and which demodulates the information signals.

6. A wired spread spectrum communication method in which information signals that have been spread by spreading codes are transmitted through transmission paths, the wired spread spectrum communication method including the steps of outputting spread spectrum signals that have been generated on the basis of specified spreading codes at specified timings as sync signals, superposing the sync signals to the information signals and transmitting them out to the transmission paths.

7. The wired spread spectrum communication device as claimed in claim 6, wherein the specified timings are arbitrary timings for superposing one or more sync signals within a single cycle of the spreading codes for spreading the information signals or one sync signal to a plurality of cycles.

8. The wired spread spectrum communication device as claimed in claim 6, wherein the spread spectrum signals are square waves of the specified spreading codes or are generated by multiplying the specified spreading codes with sine wave signals.

9. The wired spread spectrum communication device as claimed in claim 7, wherein the spread spectrum signals are square waves of the specified spreading codes or are generated by multiplying the specified spreading codes with sine wave signals.

10. A wired spread spectrum communication method in which received signals including information signals that have been spread by spreading codes are received from transmission paths, the wired spread spectrum communication method including the steps of generating, on the basis of sync signals extracted by obtaining correlations between the received signals that have been received from the transmission paths and specified spreading codes owned by sync signals that have been superposed to the received signals, back-spread spectrum signals that are capable of demodulating information signals, and performing back-spread of the received signals on the basis of the back-spread spectrum signal codes for demodulating the information signals.

11. A wired spread spectrum communication system which communicates information signals that have been spread by spreading codes to transmission paths, the wired spread spectrum communication system comprising

a transmitting device which outputs spread spectrum signals generated on the basis of specified spreading codes at specified timings as sync signals and which superposes the sync signals to the information signals for transmitting them out to the transmission paths, and

a receiving device which generates, on the basis of sync signals extracted by obtaining correlations between the received signals that have been received from the transmission paths and specified spreading codes owned by sync signals that have been superposed to the received signals, back-spread spectrum signals that are capable of demodulating information signals, and which performs back-spread of the received signals on the basis of the back-spread spectrum signal for demodulating the information signals.