 Digital time division multiplex telecommunication network |
| In accordance with the invention, the foregoing and other objects are achieved in that the TDM ... |
|
| Roulette-type game apparatus |
| What is claimed is: 1. A roulette-type game apparatus comprising: a base (11); a signaling plate (30... |
|
| Wood type golf club |
| I claim: 1. A distance wood type golf club having a head, a relatively large flat top surface, a ... |
|
| System and method for obtaining synchronization to a digital frame |
| What is claimed is: 1. In a digital signal system in which digital signals are received in frames ... |
|
| Font and method for printing cursive script |
| OF THE INVENTION The cursive font of this invention contains the characters of the English ... |
|
| Digital multiplexing system |
| What we claim is: 1. A digital multiplexing and demultiplexing system in which a number of incoming ... |
|
| Slewing tower for ladles |
| What is claimed is: 1. A slewing tower for casting ladles filled with molten metal, comprising: a ... |
|
| Enhanced time of arrival method |
| A general object of the invention is using the least amount of bandwidth possible to yield accurate ... |
|
|
Spread spectrum transmitter, spread spectrum receiver, and spread spectrum communications system
| Details |
Inventors: Shiino, Haruhiro;
Assignee: Oki Electric Industry Co., Inc. (Tokyo, JP)
Primary Examiner: Chin; Stephen
Assistant Examiner: Jiang; Lenny
Attorney, Agent or Firm: Venable, Kunitz; Norman N.
A spread spectrum communications system is provided for reducing the number of required matched filters to simplify the configuration associated with the reception. In a spread spectrum transmitter, a plurality of spread channel signals are synthesized by shifting their respective phases by a time sufficiently shorter than one symbol period. In a spread spectrum receiver, a plurality of spread code sequences are set one by one at a tap of a single matched filter in one symbol period in a time division manner to recover transmitted data. |
|
DETAILED DESCRIPTION It is an object of the present invention to provide a spread spectrum transmitter, a spread spectrum receiver, and a spread spectrum communications system which can simplify the configuration of a receiver.
To achieve the above object, the present invention provides, in a first aspect, a spread spectrum transmitter comprising (1) spread code generating means for generating a plurality of synchronized spread codes, (2) a plurality of spreading means each for spreading data directed thereto within a plurality of parallel input data with one of the spread codes supplied thereto to form a channel signal, (3) interchannel phase difference forming means for processing the plurality of channel signals such that the plurality of channel signals have phase differences in predetermined unit time increments, and (4) combining means for combining the plurality of channel signals having the phase differences to form a transmission path channel signal.
The present invention also provides, in a second aspect, a spread spectrum receiver comprising (1) spread code generating means capable of generating a plurality of spread codes, the spread code generating means selectively outputting the generated spread codes, (2) single matched filter means having a tap, wherein a spread code output from the spread code generating means is set at the tap, for outputting a correlation signal indicative of a correlation of a received transmission path channel signal with the spread code set at the tap, (3) control means for sequentially switching the plurality of spread codes and setting a spread code at the tap of the matched filter means, and (4) output means for recovering data transmitted from a corresponding spread spectrum transmitter, on the basis of the correlation signal output from the matched filter means.
Further, a spread spectrum communications system according to a third aspect of the present invention comprises the spread spectrum transmitter according to the first aspect of the present invention and the spread spectrum receiver according to the second aspect of the present invention
|
| Related patents |
|
|
Intelligent copy and paste operations for application handling units, preferably handsets
In accordance with the invention there is provided a method of transferring data from one application to another in an application handling unit controlling a plurality ...
|
|
|
Network terminating terminal apparatus for integrated services digital network
According to the present invention, network terminating terminal apparatus, for an integrated services digital network, comprises: a U-interface (412) for connection to ...
|
|
|
System and method for telephone network testing
To overcome the limitations in the prior art described above, and to overcome other limitations that will become apparent upon reading and understanding the present ...
|
|
|
Anthropomorphic mammography and lung phantoms
The present invention comprises anthropomorphic phantoms for use in conjunction with mammography and lung x-ray applications. The anthropomorphic phantoms of the present ...
|
|
|
Symbol reader using differentiating circuit for light beam focusing
An object of the present invention is to provide an optical device which accurately reads symbols over a broad read range without increasing its cost and complexity over ...
|
|
|
Radio-diagnostic equipment with shutter
In accordance with the principles of the invention the device which regulates the position of the individual lamellae of the shutter has spring elements which by ...
|
|
|
Flash-erase-type nonvolatile semiconductor storage device
An object of the present invention is to provide an efficient redundant architecture for a flash-erase-type nonvolatile semiconductor storage device, and a method ...
|
|
|
Telephone ringing extender
In the drawing, a subscriber telephone loop shown as ring conductor 10 and tip conductor 11 is connected from the central office to the left of the drawing to the ...
|
|
|
Speakerphone test set
This and other needs are met by the present invention which provides a telephone test set having means for performing dry loop testing of telephone lines, a passive ...
|
|
|
Laser diode system
OF AN ILLUSTRATIVE EMBODIMENT OF THIS INVENTION FIG. 1 shows a laser bar 10 with, illustratively, three emitting surfaces, or facets, 12, 14, and 16. The facets are ...
|
|
|
Cell Phones 
