Transceiver for performing time division full duplex spread spectrum communication

• US 6,104,745 A
• Filed: 06/26/1997
• Issued: 08/15/2000
• Est. Priority Date: 06/30/1996
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Koh, Hyung
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): Bayard, Emmanuel
• Application Number:
  US08/883,023
• Time in Patent Office: 1,146 Days
• Field of Search: 375/200, 375/208, 375/219, 375/221, 375/283, 370/276, 370/270, 370/280, 370/282, 370/284, 370/290, 370/321, 370/323, 370/337, 455/73, 455/78, 455/83, 455/80
• US Class Current: 375/130
• CPC Class Codes: H04B 1/56 with provision for simultaneous communication in two directions
• CPC Class Codes: H04L 5/1469 using time-sharing

Abstract

A transceiver for performing direct conversion, time division, full duplex, spread spectrum communication using differential binary phase shift modulation comprises: an antenna for respectively transmitting and receiving signals according to a transmission mode and a receiving mode; a time division duplexer, operatively coupled to the antenna, for selecting between the transmission mode and the receiving mode in a given interval, the duplexer using a control signal to switch between the modes; an oscillator for providing an oscillation frequency; a phase shifter, operatively coupled to the oscillator, for shifting the oscillation frequency to a given phase; a first frequency mixer, operatively coupled to the duplexer and the oscillator, for generating a first base band signal by synthesizing the oscillation frequency and a signal received from the antenna through the duplexer in receiving mode; a second frequency mixer, operatively coupled to the duplexer and the phase shifter, for generating a second base band signal by synthesizing the phase shifted oscillation frequency and the received signal from a the duplexer; a demodulator, operatively coupled to the first and second frequency mixers, for generating pseudo noise data by decoding the first and second base band signals; a filter for converting a square wave signal of pseudo noise data to a sine wave signal of the same; and a third frequency mixer, operatively coupled to the filter, for generating a transmission signal by synthesizing the sine wave and the oscillation frequency, the transmission signal being provided to the antenna through the duplexer for transmission in the transmission mode.

Claims

1. A transceiver for performing direct conversion, time division, full duplex, spread spectrum communication using differential binary phase shift modulation, the transceiver comprising:

an antenna for respectively transmitting and receiving signals according to a transmission mode and a receiving mode;

a time division duplexer, operatively coupled to the antenna, for selecting between the transmission mode and the receiving mode in a given interval;

an oscillator for providing an oscillation frequency;

a phase shifter, operatively coupled to the oscillator, for shifting the oscillation frequency to a given phase;

a first frequency mixer, operatively coupled to the duplexer and the oscillator, for generating a first base band signal by synthesizing the oscillation frequency and a signal received from the antenna through the duplexer in a receiving mode;

a second frequency mixer, operatively coupled to the duplexer and the phase shifter, for generating a second base band signal by synthesizing the phase shifted oscillation frequency and the received signal from the duplexer;

a demodulator, operatively coupled to the first and second frequency mixers, said demodulator passing analog signals therethrough and for generating pseudo noise data by decoding the first and second base band signals, said second base band signal substantially following the first base band signal with a shift of approximately 90°

;

a filtering for converting a square wave signal of pseudo noise data to a sine wave signal of the same; and

a third frequency mixer, operatively coupled to the filter, for generating a transmission signal by synthesizing the sine wave and the oscillation frequency, the transmission signal being provided to the antenna through the duplexer for transmission in the transmission mode.

2. The transceiver as defined in claim 1, further comprising a first filter, operatively coupled to the duplexer, for passing a signal within a given frequency band received from the duplexer in the receiving mode.

3. The transceiver as defined in claim 1, further comprising an amplifier, operatively coupled to the duplexer, for amplifying the received signal from the duplexer and respectively providing the amplified received signal to the first and second frequency mixers.

4. The transceiver as defined in claim 1, further comprising a second filter, operatively coupled to the first frequency mixer, for passing substantially only the first base band signal to the demodulator.

5. The transceiver as defined in claim 1, further comprising a third filter, operatively coupled to the second frequency mixer, for passing substantially only the second base band signal to the demodulator.

6. The transceiver as defined in claim 1, further comprising a power amplifier, operatively coupled to the third frequency mixer, for amplifying the transmission signal.

7. The transceiver as defined in claim 1, wherein the second base band signal is demodulated orthogonally.

8. A transceiver for performing direct conversion, time division, full duplex, spread spectrum communication using differential binary phase shift modulation, the transceiver comprising:

means for respectively transmitting and receiving signals according to a transmission mode and a receiving mode;

switching means, operatively coupled to the transmitting/receiving means, for selecting between the transmission mode and the receiving mode in a given interval;

oscillating means for providing an oscillation frequency;

phase shifting means, operatively coupled to the oscillating means, for shifting the oscillation frequency to a given phase;

first frequency mixing means, operatively coupled to the switching means and the oscillating means, for generating a first base band signal by synthesizing the oscillation frequency and a signal received from the transmitting/receiving means through the switching means in a receiving mode;

second frequency mixing means, operatively coupled to the switching means and the phase shifting means, for generating a second base band signal by synthesizing the phase shifted oscillation frequency and the received signal from the switching means;

demodulating means, operatively coupled to the first and second frequency mixing means, said demodulating means passing analog signals therethrough and for generating noise data by decoding the first and second base band signals, said second base band signal substantially following the first base band signal with a shift of approximately 90°

;

filtering means for converting a square wave signal of pseudo noise data to a sine wave signal of the same; and

third frequency mixing means, operatively coupled to the filing means, for generating a transmission signal by synthesizing the sine wave and the oscillation frequency, the transmission signal being provided to the transmitting/receiving means through the switching means for transmission in the transmission mode.

9. The transceiver as defined in claim 8, wherein the second base band signal is demodulated orthogonally.