Pulsed based communication system

• US 7,792,229 B2
• Filed: 09/29/2004
• Issued: 09/07/2010
• Est. Priority Date: 11/10/2003
• Status: Expired due to Fees

• Current Assignee: Semiconductor Technology Academic Research Center
• Original Assignee: Semiconductor Technology Academic Research Center
• Inventors: Furukawa, Jun, Sanada, Yukitoshi
• Primary Examiner(s): Payne; David C
• Assistant Examiner(s): Wong; Linda
• Application Number:
  US10/951,807
• Publication Number:
  US 20050100079A1
• Time in Patent Office: 2,169 Days
• Field of Search: 375/149, 375/145, 375/137, 375/134, 375/371, 375/354, 375/362, 375/368, 375/367, 375/366
• US Class Current: 375/354
• CPC Class Codes: H04B 1/7183 Synchronisation

Abstract

A communication system for pulse based communication using a sequence acquisition system using the correlation method in UWB communications which generates a pulse detection signal differing in phase by exactly a predetermined period (τ) from the transmission information of a pulse signal of a predetermined period at the transmission side and reception side, uses the pulse detection signal to establish synchronization at the reception side, then generates transmission information at the reception side by making its phase different by exactly a predetermined time from the synchronized pulse detection signal so as to establish synchronization between the reception signal and the transmission information, whereby it is possible to enable synchronization acquisition and shorten the synchronization acquisition time without complicating the hardware and even without the presence of information in the transmission signal.

Claims

1. A transmission circuit for pulse based communication, provided with:

a first pulse generator for generating transmission information as a pulse signal of a predetermined period, said transmission information being generated by an information transmission PN code or an information transmission Baker Code,

a second pulse generator generating a pulse detection signal at said predetermined period, said pulse detection signal being a clock signal without having said information transmission PN code or said information transmission Baker code,

a control circuit controlling said first pulse generator and said second pulse generator to make a phase difference of the phases of the pulses output from said first pulse generator and said second pulse generator so that the pulses output form the second pulse generator are delayed from the pulses output from the first pulse generator by a predetermined time, and

an adder adding the output of said first pulse generator and the output of said second pulse generator and outputting the result;

wherein

a synchronization acquisition time is shortened even without the presence of transmission information in a communication signal.

2. A transmission circuit as set forth in claim 1, wherein said pulse based communication is impulse based UWB.

3. A reception circuit for pulse based communication, provided with:

a reception side first pulse generator generating transmission information as a pulse signal of a predetermined period, said transmission information being generated by an information transmission PN code or an information transmission Baker Code,

a reception side second pulse generator generating a pulse detection signal at said predetermined period, said pulse detection signal being a clock signal without having said information transmission PN Code or said information transmission Baker Code,

a control circuit making a phase difference of the phases of the pulses output from said first pulse generator and said second pulse generator so that the pulses output from the second pulse generator are delayed from the pulses output from the first pulse generator by a predetermined time,

a multiplier multiplying a received signal with one of the output of said first pulse generator and the output of said second pulse generator, and

a demodulating means reproducing demodulated data from output of said multiplier,

at a first stage of synchronization acquisition, having said multiplier give the result of multiplication of said pulse detection signal output from said second pulse generator with the received signal to said demodulating means and establish synchronization of said pulse detection signal by said demodulating means and,

after said first stage, controlling said first pulse generator by said control circuit so that an output of said first pulse generator differs from the phase of the pulse output from said second pulse generator by exactly said predetermined value so as to establish synchronization between the received signal and the output signal of said first pulse generator;

wherein

a time for synchronization acquisition is shortened even without the presence of transmission information in a communication signal.

4. A reception circuit as set forth in claim 3, wherein said pulse based communication is impulse based UWB.

5. A communication system for pulse based communication, provided with:

a transmission circuit provided with;

a first pulse generator generating transmission information as a pulse signal of a predetermined period, said transmission information being generated by an information transmission information in a communication signal.

6. A communication system as set forth in claim 5, wherein said pulse based communication is impulse based UWB.

7. A synchronization acquisition method for pulse based communication, comprising:

generating a pulse detection signal with a phase different by exactly a predetermined period from transmission information of a pulse signal of a predetermined period, said transmission information being generated by an information transmission PN code or an information transmission Baker Code, and said pulse detection signal being a clock signal without having said information transmission PN code or said information transmission Baker code,

establishing synchronization at a reception side using said pulse detection signal, then

generating at the reception side said transmission information by making the phase different by exactly said predetermined time from said pulse detection signal for which synchronization is established so as to establish synchronization between a received signal and said transmission information;

wherein

a time for the establishing synchronization is shortened even without the presence of transmission information in a communication signal.

8. A synchronization acquisition method as set forth in claim 7, wherein said pulse based communication is impulse based UWB.

9. A synchronization acquisition method as set forth in claim 7, wherein said transmission information is comprised of a direct sequence (DS) modulated code comprised of a sequence of inverted and noninverted pulses.

10. A synchronization acquisition method as set forth in claim 7, wherein said transmission information is a code time hopping (TH) modulated according to whether the phase of each pulse is shifted by a predetermined time.

11. A method of pulse based communication, comprising:

generating a pulse signal having a predetermined period, the pulse signal being generated by an information transmission PN code or an information transmission Baker Code;

generating a pulse detection signal at the predetermined period, the pulse detection signal being a clock signal without having said information transmission PN code or said information transmission Baker code;

comparing a phase of the pulse signal to a phase of the pulse detection signal;

making a phase difference between the phase of the pulse signal and the phase of the pulse detection signal so that the pulse detection signal is delayed from the pulse signal by a predetermined time;

adding the pulse signal and the pulse detection signal to form a resulting signal; and

outputting the resulting signal.