Receiving station for wireless telephone system with diversity transmission and method

• US 6,778,515 B2
• Filed: 03/12/2002
• Issued: 08/17/2004
• Est. Priority Date: 09/06/1994
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: LaVean, Gilbert E, Bolgiano, D. Ridgely
• Primary Examiner(s): Duong, Frank
• Application Number:
  US10/095,961
• Publication Number:
  US 20020089966A1
• Time in Patent Office: 889 Days
• Field of Search: 370/320, 370/321, 370/335, 370/336, 370/337, 370/347, 370/441, 370/442, 375/130, 375/141-147, 342/350, 342/357.08, 342/450, 342/463
• US Class Current: 370/335
• CPC Class Codes: G01S 5/10 Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements , e.g. omega or decca systemsG01S5/12 takes precedence ; beacons and receivers cooperating therewith G01S1/306, G01S1/308
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/082 selecting best antenna path
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04B 7/0888 with selection
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A subscriber station for a cellular system that utilizes transmission diversity by transmitting a plurality time slotted signals for communicating data. A receiver sequentially receives at least a first data signal corresponding to the data in a first time slot and a second data signal corresponding to the data in a second time slot. The second time slot occurring after the first time slot so that the data signals are not simultaneously received. A combiner for reconstructs the data from the received data signals. Where the subscriber station is for a CDMA cellular system, the receiver receives the first and second time slotted data signals as PN spread spectrum modulated data signals. A despreader and demodulator despreads and demodulates the received data signals using PN codes and the combiner reconstructs the data from the despread and demodulated data signals. In one embodiment, first and second PN codes used by the receiver are part of a PN code sequence produced by a PN code generator without resetting. Preferably, the despreader and demodulater discriminate against all other PN spread spectrum modulated data signals. Preferably, the subscriber station includes a measuring device for measuring respective times of arrival of the received data signals and a processor for computing the location of the subscriber station from respective measured times of arrival of the data signals.

Claims

1. In a cellular system that utilizes transmission diversity by transmitting a plurality of time slotted data signals, a method of using a receiving station comprising:

receiving a first data signal corresponding to data in a first time slot;

receiving a second data signal corresponding to the same data in a second time slot, said second time slot occurring after said first time slot wherein said first and second time slots are selected so that said first data signal and said second data signal are not simultaneously received; and

reconstructing the data from the received first and second data signals.

2. A method for a CDMA receiving station in accordance with claim 1 further comprising:

receiving the first and second data signals as PN spread spectrum modulated data signals;

despreading and demodulating the received first PN spread spectrum modulated data signal using a first PN code;

despreading and demodulating the received second PN spread spectrum modulated data signal using a second PN code; and

reconstructing the data from the despread and demodulated data signals.

3. A method in accordance with claim 2 where the first and second PN codes used by the receiving station are part of a PN code sequence produced by a PN code generator without resetting.

4. A method in accordance with claim 2 wherein the despreading and demodulating discriminates against all other PN spread spectrum modulated data signals.

5. A method in accordance with claim 2 further comprising:

receiving a third PN spread spectrum modulated data signal corresponding to the data in a third time slot different from said first and second time slots at said receiving station; and

despreading and demodulating the received third PN spread spectrum modulated data signal using a third PN code; and

reconstructing the data from the received first second and third data signals after despreading and demodulating.

9. A method in accordance with claim 1 further comprising:

receiving a third data signal corresponding to the data in a third time slot different from said first and second time slots at said receiving station; and

reconstructing the data from the received first, second and third data signals.

6. In a cellular system that utilizes transmission diversity by transmitting a plurality of time slotted data signals including first, second and third PN spread spectrum modulated data signals, where the first PN spread spectrum modulated data signal is transmitted from a first antenna, the second PN spread spectrum modulated data signal is transmitted from a second antenna spaced apart from the first antenna and the third PN spread spectrum modulated data signal is transmitted from a third antenna spaced apart from the first and second antennas, a method of using a receiving station for communication of data comprising:

receiving a first data signal corresponding to the data in a first time slot;

receiving a second data signal corresponding to the data in a second time slot, said second time slot occurring after said first time slot wherein said first and second time slots are selected so that said first data signal and said second data signal are not simultaneously received;

receiving the first and second data signals as PN spread spectrum modulated data signals;

despreading and demodulating the received first PN spread spectrum modulated data signal using a first PN code;

despreading and demodulating the received second PN spread spectrum modulated data signal using a second PN code;

receiving a third PN spread spectrum modulated data signal corresponding to the data in a third time slot different from said first and second time slots at said receiving station;

despreading and demodulating the received third PN spread spectrum modulated data signal using a third PN code;

reconstructing the data from the received first, second and third data signals after despreading and demodulating;

measuring respective times of arrival of the first, second and third transmitted data signals at said receiving station; and

computing the location of said receiving station from said respective measured times of arrival of said first, second and third transmitted data signals.

7. A method in accordance with claim 6 wherein the despreading and demodulating discriminates against all other PN spread spectrum modulated data signals.

8. A method in accordance with claim 6 where the first, second and third PN codes used by the receiving station are part of a PN code sequence produced by a PN code generator without resetting.

10. In a cellular system that utilizes transmission diversity by transmitting a plurality of time slotted data signals, a method of using a receiving station for communication of data comprising:

receiving a first data signal corresponding to the data in a first time slot;

receiving a second data signal corresponding to the data in a second time slot, said second time slot occurring after said first time slot wherein said first and second time slots are selected so that said first data signal and said second data signal are not simultaneously received;

reconstructing the data from the received first and second data signals;

measuring respective times of arrival of the received data signals at said receiving station; and

computing the location of said receiving station from said respective measured times of arrival of said data signals.

11. A subscriber station for a cellular system that utilizes transmission diversity by transmitting a plurality time slotted signals comprising:

a receiver for sequentially receiving a first data signal corresponding to data in a first time slot and a second data signal corresponding to the same data in a second time slot, said second time slot occurring after said first time slot wherein said first and second time slots are selected so that said first data signal and said second data signal are not simultaneously received; and

a combiner for reconstructing the data from the received data signals.

12. A subscriber station for a CDMA cellular system according to claim 11, wherein the receiver receives the first and second time slotted data signals as PN spread spectrum modulated data signals further comprising:

a despreader and demodulator which despreads and demodulates the received first data signal using a first PN code and despreads and demodulates the received second data signal using a second PN code; and

said combiner configured to reconstruct the data from the despread and demodulated data signals.

13. A subscriber station in accordance with claim 12 where the first and second PN codes used by the receiver are part of a PN code sequence produced by a PN code generator without resetting.

14. A subscriber station in accordance with claim 12 wherein the despreader and demodulater discriminate against all other PN spread spectrum modulated data signals.

15. A subscriber station in accordance with claim 12 wherein the receiver is configured to receive a third PN spread spectrum modulated data signal corresponding to the data in a third time slot different from said first and second time slots and the despreader and demodulater despreads and demodulates the received third data signal using a third PN code.

17. A subscriber station in accordance with claim 15 where the first, second and third PN codes used by the receiver are part of a PN code sequence produced by a PN code generator without resetting.

18. A subscriber station in accordance with claim 11 wherein the receiver is configured to receive a third data signal corresponding to the data in a third time slot different from said first and second time.

16. A subscriber station for a cellular system that utilizes transmission diversity by transmitting a plurality time slotted signals for communicating data comprising:

a receiver for sequentially receiving a first data signal corresponding to the data in a first time slot and a second data signal corresponding to the data in a second time slot, said second time slot occurring after said first time slot wherein said first and second time slots are selected so that said first data signal and said second data signal are not simultaneously received wherein the receiver receives the first and second time slotted data signals as PN spread spectrum modulated data signals and wherein the receiver is configured to receive a third PN spread spectrum modulated data signal corresponding to the data in a third time slot different from said first and second time slots;

a despreader and demodulator which despreads and demodulates the received first data signal using a first PN code, despreads and demodulates the received second data signal using a second PN code and despreads and demodulates the received third data signal using a third PN code;

a combiner configured to reconstruct the data from the despread and demodulated data signals;

a measuring device for measuring respective times of arrival of the first, second and third received data signals at the subscriber station; and

a processor for computing the location of the subscriber station from respective measured times of arrival of said first, second and third data signals.

19. A subscriber station for a cellular system that utilizes transmission diversity by transmitting a plurality time slotted signals for communicating data comprising:

a receiver for sequentially receiving a first data signal corresponding to the data in a first time slot and a second data signal corresponding to the data in a second time slot, said second time slot occurring after said first time slot wherein said first and second time slots are selected so that said first data signal and said second data signal are not simultaneously received wherein the receiver receives the first and second time slotted data signals as PN spread spectrum modulated data signals where first, second and third PN codes used by the receiver are part of a PN code sequence produced by a PN code generator without resetting and wherein the receiver is configured to receive a third PN spread spectrum modulated data signal corresponding to the data in a third time slot different from said first and second time slots;

a despreader and demodulator which despreads and demodulates the received first data signal using a first PN code, despreads and demodulates the received second data signal using a second PN code and despreads and demodulates the received third data signal using a third PN code;

a combiner configured to reconstruct the data from the despread and demodulated data signals;

a measuring device for measuring respective times of arrival of the first, second and third received data signals at the subscriber station; and

a processor for computing the location of the subscriber station from respective measured times of arrival of said first, second and third data signals.

20. A subscriber station for a cellular system that utilizes transmission diversity by transmitting a plurality time slotted signals for communicating data comprising:

a receiver for sequentially receiving a first data signal corresponding to the data in a first time slot and a second data signal corresponding to the data in a second time slot, said second time slot occurring after said first time slot wherein said first and second time slots are selected so that said first data signal and said second data signal are not simultaneously received;

a combiner for reconstructing the data from the received data signals;

a measuring device for measuring respective times of arrival of the first and second received data signals at the subscriber station; and

a processor for computing the location of the subscriber station from respective measured times of arrival of said first and second data signals.