Method for recovering a data signal using diversity in a radio frequency, time division multiple access communication system

• US 5,390,166 A
• Filed: 07/14/1993
• Issued: 02/14/1995
• Est. Priority Date: 07/14/1993
• Status: Expired due to Term

• Current Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Reed, John D., Rohani, Kamyar
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Kizou, Hassan
• Application Number:
  US08/091,846
• Time in Patent Office: 580 Days
• Field of Search: 370/18, 370/95.1, 370/95.3, 375/1, 375/38, 375/100, 375/40, 375/96, 379/59, 379/60, 455/33.1, 455/33.2, 455/33.4, 455/133, 455/137
• US Class Current: 370/335
• CPC Class Codes: H04B 7/02 Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas RAKE receivers H04B1/7115

Abstract

In a time division multiple access (TDMA) system (10), a method (50, 60) of recovering a data signal of a transmission burst commences by obtaining the frequency transmission codes for the transmitters to be monitored (52, 62). The data signal is then received in separate transmission bursts from a first transmitter in a first time period (53, 65) and from a second transmitter in a second time period (56, 65). The data signal of one of the received transmission bursts is then selected or a plurality of the data signals are combined (58, 69) to be used by the receiver as the received data signal.

Claims

1. A method for recovering a data signal using diversity in a RF (Radio Frequency) TDMA (Time Division Multiple Access) communication system, said method comprising the steps of:

obtaining a frequency transmission pattern for each of a plurality of transmitters;

using a first frequency transmission pattern of a first transmitter to recover said data signal from a first transmission burst in a first time period;

using a second frequency transmission pattern of a second transmitter to recover said data signal from a second transmission burst in a second time period, said second time period being subsequent to said first time period; and

combining said data signal as recovered in said first time period with said data signal as recovered in said second time period.

2. The method of claim 1 wherein said RF TDMA communication system is a frequency hopping code division multiple access (FH-CDMA) system.

3. The method of claim 1 further comprising the step of switching from a frequency of said first transmitter to a frequency of said second transmitter following said first time period.

4. The method of claim 1 further comprising the step of storing said data signal recovered during said first time period.

5. The method of claim 1 further comprising the steps of demodulating said first and second transmission bursts.

6. The method of claim 1 wherein said first and second time periods are each a time slot.

7. The method of claim 1 wherein said first and second time periods are contained within a single time slot.

8. A method for recovering a data signal using diversity in a RF (Radio Frequency) TDMA (Time Division Multiple Access) communication system, said method comprising the steps of:

obtaining a frequency transmission pattern for each of a plurality of transmitters;

using a first frequency transmission pattern of a first transmitter to recover said data signal from a first transmission burst in a first time period;

switching from a frequency of said first transmitter to a frequency of a second transmitter following said first time period;

using a second frequency transmission pattern of said second transmitter to recover said data signal from a second transmission burst in a second time period; and

selecting said data signal as recovered in said first time period or said second time period.

9. The method of claim 8 wherein said RF TDMA communication system is a frequency hopping code division multiple access (FH-CDMA) system.

10. The method of claim 8 further comprising the step of storing said data signal of said first transmission burst.

11. The method of claim 8 further comprising the step of demodulating said first and second transmission bursts.

12. The method of claim 8 wherein said first and second time periods are each a time slot.

13. The method of claim 8 wherein said first and second time periods are contained within a single time slot.

14. A method for recovering a data signal using diversity in a RF (Radio Frequency) TDMA (Time Division Multiple Access) communication system, said method comprising the steps of:

obtaining a frequency transmission code for each of a plurality of transmitters;

using a first frequency transmission code of a first transmitter to despread a first transmission burst during a first time period;

recovering said data signal from said first transmission burst;

switching, according to a second frequency transmission code, to a second frequency during a second time period;

using said second frequency transmission code of a second transmitter to despread a second transmission burst during a third time period;

recovering said data signal from said second transmission burst; and

combining said data signal as recovered from said first transmission burst and said data signal as recovered from said second transmission burst.

15. The method of claim 14 wherein said first and third time periods are each a time slot.

16. The method of claim 14 wherein said second and third time periods are contained within a single time slot.

17. The method of claim 14 wherein said TDMA communication system is a frequency hopping code division multiple access (FH-CDMA) communication system.

18. A method for recovering a data signal using diversity in a RF (Radio Frequency) TDMA (Time Division Multiple Access) communication system, said method comprising the steps of:

(a) obtaining a frequency transmission code for each of a plurality of transmission bursts to be recovered;

(b) receiving one of said plurality of transmission bursts transmitted from one of a plurality of transmitters if fewer than all of said plurality of transmission bursts have been recovered;

(c) demodulating said transmission burst, forming a demodulated transmission burst;

(d) storing said data signal recovered from said demodulated transmission burst if said data signal has been recovered from fewer than all of said plurality of transmission bursts;

(e) repeating steps (a)-(d) until all of said plurality of transmission bursts have been received; and

(f) combining the data signals recovered from said demodulated transmission bursts forming a recovered signal.

19. The method of claim 18 wherein said TDMA communication system is a frequency hopping code division multiple access (FH-CDMA) communication system.