SPACE DIVERSITY PHASED ARRAY RETRANSMISSION SYSTEM USING TIME DIVISION

• US 3,696,421 A
• Filed: 06/06/1969
• Issued: 10/03/1972
• Est. Priority Date: 06/06/1969
• Status: Expired due to Term

• Current Assignee: Jesse S. Bitler
• Original Assignee: Jesse S. Bitler
• Inventors: Bitler, Jesse S.
• Primary Examiner(s): Farley, Richard A.
• Assistant Examiner(s): Kinberg, R.
• Application Number:
  US04/831,132
• Time in Patent Office: 1,215 Days
• Field of Search: 343/1TD,6.5,178,179,117A 325/14
• US Class Current: 342/370
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003

Abstract

An adaptive retransmission station operates at a single reception and transmission frequency by use of time division while full duplex operation is provided by appropriate sampling. This scheme is especially well suited to mobile radio systems operating at microwave frequencies in populated areas. A timing sequence is established with three individual time slots for transmission of samples of a phase reference signal from base to remote, an intelligence bearing signal from base to remote, and a generated return intelligence bearing signal from remote to base. Time dedicated to transit delay is provided after transmission of the intelligence signals from both the base and remote stations.

Claims

1. A communication system comprising originating means for transmitting exclusively in a first discrete time period a phase reference signal and for transmitting exclusively in a second discrete time period an original intelligence signal, a space diversity array of antenna elements for receiving said phase reference and said original intelligence signals, a source for producing a return intelligence signal, a plurality of retransmission means each associated with one of said elements of said array for adjusting the phase of said return intelligence signal to the conjugate phase of said phase reference signal received by said one element and for transmitting via said one element said adjusted return intelligence signal exclusively in a third discrete time period.

2. A communication system as claimed in claim 1 further comprising a plurality of phasing means each associated with one of said elements of said array for bringing to a common phase each of said original intelligence signals received by each of said elements, means for combining said commonly phased signals, and utilization means for detecting said intelligence from the combined signals.

3. A communication system as claimed in claim 1 wherein said means for transmitting said phase reference signal and said means for retransmitting said return intelligence signal produce signals of substantially the same frequency.

4. A communication system as claimed in claim 1 wherein said originating means includes gating circuits for sampling a continuous phase reference signal and a continuous intelligence signal and for sampling in said first and said second discrete time periods segments of said continuous phase reference and intelligence signals respectively, and said retransmission means includes a retransmission gating circuit for sampling said continuous return intelligence signal and for passing in said third discrete time period segments of said continuous retransmission signal and a reference gating circuit for sampling the received signals and exclusively passing said phase reference signal.

5. A communication system as claimed in claim 4 further comprising an intelligence gating circuit for sampling the received signals and exclusively passing said original intelligence signal.

6. A communication system as claimed in claim 4 wherein said gating circuits included in said retransmission means are enabled by a clock which is reset by the arrival of said phase reference signal.

7. A communication system as claimed in claim 4 wherein said retransmission means includes means for reconstructing a continuous phase reference signal from the received segments of said phase reference signal.

8. A communication system as claimed in claim 7 wherein said means for reconstructing a continuous phase reference signal is a phase lock loop.

9. A communication system comprising means for transmitting from an originating station a segment of a phase reference signal in one selected time slot, means for receiving at a retransmitting station said segment of a phase reference signal after a finite transit delay by a plurality of spatially separated antenna elements, means for reconstructing from each of the plurality of received segments associated with each of said elements a plurality of continuous phase reference signals, means for producing a return intelligence signal, means associated with each of said antenna elements for combining said plurality of continuous phase reference signals with portions of said return intelligence signal to produce generated signals having the phase opposite to that of the phase reference signal associated with that element, means for retransmitting said generated signals from each of said elements for aNother selected time slot separated from said one selected time slot by at least the combined times of transmission from said originating station and said transit delay.

10. A communication system having a base station and a remote station, said base station including means for transmitting a pilot signal and an information signal and means for receiving a generated signal, said remote station including a plurality of circuit loops each of said loops comprising means for receiving both said pilot and said information signals and for transmitting the generated signal, means for adjusting the phase of the generated signal so that it has the conjugate phase of the pilot signal received by that loop characterized in that said pilot, said information and said generated signals are all of the substantially identical frequency, said base station includes a first sequencing means for transmitting said pilot signal exclusively during a first discrete time slot and for transmitting said information signal exclusively during a second discrete time slot, and said remote station includes in each of said loops a second sequencing means for transmitting said generated signal exclusively during a third discrete time and means for storing phase information obtained from said received pilot signal for use in said third time slot.