 Refuse compacting and transporting system |
| Referring to the drawings in detail, wherein like numerals designate like parts, a refuse ... |
|
| Humane animal trap |
| What I claim is: 1. An animal trap comprising a casing, said casing including opposed upper and ... |
|
| Dust bag for animal insecticide |
| OF THE INVENTION In the accompanying drawings which form a part of the specification and are to be ... |
|
| Heater |
| I claim: 1. A heater for heating a process fluid, said heater comprising, in combination: (a) an ... |
|
| Two stage circulating fluidized bed reactor and method of operating the reactor |
| The present invention, in a radical departure from the conventional circulating fluidized bed ... |
|
| Watering system for fowl and small animals |
| This invention relates to a watering system for fowl and small animals and particularly to the ... |
|
| Camera having an electronic zooming display feature |
| This invention is directed to the solution of the above stated problem of the prior art. It is ... |
|
| Aquarium/terrarium crossover bridge assembly |
| OF THE DRAWINGS Referring to FIG. 1, there is provided a generally A-frame configuration arched ... |
|
| Animal feeder with automatic dispenser |
| The present invention comprises an animal feeder as, for example, for a hog which has an upper bin ... |
|
|
Spread spectrum pulse position modulation system
| Details |
Inventors: Nakamura, Masaru;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: Ghebretinsae; Temesghen
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
A spread spectrum pulse position modulation/demodulation system which receives an input signal including frames and which includes first and second pulse position modulators. The first pulse position modulator modulates each frame by inserting a first pseudo noise code into a selected slot of each frame according to the input signal to generate a first spread spectrum pulse position modulating signal. The second pulse position modulator modulates each frame by inserting a second pseudo noise code into a selected slot of each frame according to the input signal to generate a second spread spectrum pulse position modulating signal. An adder adds together the first and second spread spectrum pulse position modulating signals to generate a third spread spectrum pulse position modulating signal. This third spread spectrum pulse position modulating signal may be transmitted by a radio transmitter, and then received by a radio receiver. The received third spread spectrum pulse position modulating signal can then be input into a demodulator for demodulating this third spread spectrum pulse position modulating signal. The demodulator includes at least one matched filter to output a first pulse signal corresponding to the first spread spectrum pulse position modulating signal and to output a second pulse signal corresponding to the second spread spectrum pulse position modulating signal. |
|
DETAILED DESCRIPTION Accordingly, the present invention has been made in consideration of the above problems in the background art, and an object of the present invention is to provide a novel spread spectrum communication system using only one pseudo noise code and its inverted pseudo noise code for high-speed transmission, which is equivalent to a background system which utilizes two pseudo noise code but the present invention does not require doubling a required number of demodulator sections.
That is, the background art suffers from a drawback in that the background art systems are very difficult to implement in a network where very high speed communication is required.
The present invention allows a speeding up of communication, which can thereby allows use in a network, such as a LAN, or in other high speed applications.
The present invention achieves such objectives as noted above by utilizing a spread spectrum pulse position modulation/demodulation system which receives an input signal including frames and which includes first and second spread spectrum pulse position modulators.
The first pulse position modulator modulates the input signal by inserting a first pseudo noise code into a selected slot of each frame to generate a first spread spectrum pulse position modulating signal.
The second pulse position modulator modulates the input signal by inserting a second pseudo noise code into a selected slot of each frame to generate a second spread spectrum pulse position modulating signal.
An adder adds together the first and second spread spectrum pulse position modulating signals to generate a third spread spectrum pulse position modulating signal.
This third spread spectrum pulse position modulating signal may be transmitted by a radio transmitter, and then received by a radio receiver.
The received third spread spectrum pulse position modulating signal can then be input into a demodulator for demodulating this third spread spectrum pulse position modulating signal.
The demodulator includes at least one matched filter to output a first pulse signal corresponding to the first spread spectrum pulse position modulating signal and to output a second pulse signal corresponding to the second spread spectrum pulse position modulating signal
|
| Related patents |
|
|
Sequential detection system and method with adaptive bias
This invention relates generally to cellular telephone communications, and more particularly to a system and method for CDMA receivers to adaptively change the bias in ...
|
|
|
Control systems for radar receivers
What is claimed is: 1. In a return echo ranging system, comprising: means for transmitting a ranging signal; a receiver for receiving one or more echo signals from said ...
|
|
|
Power factor correction system
Briefly, a power factor correction (PFC) system in accordance with the present invention is coupled to at least n power lines of an n phase power distribution system. T...
|
|
|
Concentric ring antenna
To overcome the limitations of the prior art, a method and apparatus is provided to permit exciting a single antenna to emit or receive either left-hand or right-hand ...
|
|
|
Doppler frequency impulse radar system with displaced pulse sequence
I claim: 1. A doppler frequency impulse radar system, comprising a transmitting circuit for transmitting an impulse modulated carrier wave and a receiving circuit for ...
|
|
|
Method of screening infra-red radiation
I claim: 1. A method of screening infra-red radiation which comprises forming between the source of said radiation and the point of reception, an aerosol of finely ...
|
|
|
Electrical noise detector for detecting power line gap defects
In accordance with the present invention, a device for identifying a defect in power line equipment includes an antenna coupled to a radio frequency receiving means to ...
|
|
|
Test bench for wideband radio link
What we claim is: 1. A radio link test bench system, comprising: (1) transmission station means, including: (a) means including a measurement oscillator (2) for ...
|
|
|
Apparatus for accomplishing autoport selection
It is, therefore, an object of the present invention to reduce the need for technicians to make correct connections when one of two networks to which individual ...
|
|
|
Method of generating an RF signal modulated by a message signal and distorted by a predetermined fading profile for testing RF receivers, and apparatus for carrying out the method including a fading simulator
We claim: 1. In a method of generating an RF signal modulated by a message signal and distorted by a predetermined fading profile for testing RF receivers, the ...
|
|
|
Telecommunications 
