High data rate communications network employing an adaptive sectored antenna

• US 6,009,124 A
• Filed: 09/22/1997
• Issued: 12/28/1999
• Est. Priority Date: 09/22/1997
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Smith, James P., Doyle, James T.
• Primary Examiner(s): VO, DON NGUYEN
• Application Number:
  US08/934,789
• Time in Patent Office: 827 Days
• Field of Search: 375/256, 375/259, 375/267, 375/299, 375/347, 342/368, 455/68, 455/69, 455/226.1, 455/226.2, 455/562, 455/67.7
• US Class Current: 375/267
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H04B 7/0851 using training sequences or error signal minimizing error signal H04B7/0854
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables

Abstract

A high data rate communication system that employs an adaptive sectored antenna is disclosed. The high data rate communication system includes an antenna subsystem for receiving and transmitting data. The antenna subsystem is adapted to be spatially steered. A radio frequency transceiver that is coupled to the antenna subsystem and that selectively generates a bit error rate (BER) signal and a receive signal strength indication (RSSI) signal based upon a received antenna training sequence is also provided. The system also includes a beam steering state machine that is coupled to the radio frequency transceiver and that selectively generates a BER_-- PASS signal and an RSSI_-- PASS signal based upon whether the BER signal is in a first logical relationship with a predetermined BER signal and the RSSI signal is in a second logical relationship with a predetermined RSSI signal. An antenna controller is coupled to the antenna subsystem and the beam steering state machine and selectively generates antenna control signals to spatially steer the antenna subsystem based upon the BER_-- PASS signal and the RSSI_-- PASS signal.

Claims

1. A high data rate communication system comprising:

a) an antenna subsystem adapted to be spatially steered;

b) a radio frequency transceiver, coupled to the antenna subsystem, for receiving an antenna training sequence and generating a bit error rate (BER) signal and a receive signal strength indication (RSSI) signal based on the antenna training sequence;

c) a beam steering state machine, coupled to the radio frequency transceiver, for receiving the BER signal and the RSSI signal, wherein the beam steering state machine includes;

a first comparator for receiving the BER signal and a predetermined BER signal, comparing the BER signal to the predetermined BER signal, and selectively generating the BER PASS signal when the BER signal is in the first predetermined logical relationship with the predetermined BER signal; and

ii) a second comparator for receiving the RSSI signal and a predetermined RSSI signal, for comparing the RSSI signal to the predetermined RSSI signal, and for selectively generating the RSSI PASS signal when the RSSI signal is in a second predetermined logical relationship with the predetermined RSSI signal; and

d) an antenna controller, coupled to the antenna subsystem and the beam steering state machine, for receiving the BER_-- PASS signal and the RSSI_-- PASS signal and responsive thereto, selectively generating antenna control signals for spatially steering the antenna subsystem.

2. The high data rate system of claim 1 wherein the beam steering state machine selectively generates a BER_-- PASS signal and an RSSI_-- PASS signal based upon whether the BER signal is in a first logical relationship with a predetermined BER signal and the RSSI signal is in a second logical relationship with a predetermined RSSI signal.

3. The high data rate system of claim 1 wherein the antenna controller includes a counter having a first input for receiving the BER_-- PASS signal, a second input for receiving the RSSI_-- PASS signal, and responsive thereto generates said antenna control.

4. The high data rate system of claim 1 wherein the antenna subsystem includes:

a) an antenna array;

b) a phase shifter, coupled to the antenna array; and

c) a feed network coupled to the phase shifter and the radio frequency transceiver;

wherein the antenna controller provides the antenna control signals to the phase shifter and feed network for spatially steering the antenna array.

5. The high data rate system of claim 1 wherein the beam steering state machine determines whether the BER signal is less than a predetermined BER signal, if so, determining whether the RSSI signal is greater than a predetermined RSSI signal;

if so, asserting a VALID_-- DATA signal, said VALID_-- DATA indicating that data can be received or transmitted;

if the BER signal is greater than the predetermined BER signal or the RSSI is less than the predetermined RSSI signal, the beam steering state machine spatially steers the antenna array a predetermined amount; and

continues to check the BER signal and the RSSI signal and to steer the antenna array until a predetermined BER and a predetermined RSSI is obtained.

6. The high data rate system of claim 1 wherein the first predetermined logical relationship is when the BER signal is less than or equal to the predetermined BER signal.

7. The high data rate system of claim 1 wherein the second predetermined logical relationship is when the RSSI signal is greater than the predetermined RSSI signal.

8. The high data rate system of claim 1 wherein the predetermined BER signal is approximately 10^-5.

9. The high data rate system of claim 1 wherein the predetermined RSSI signal is approximately 20 dB.

10. A method of steering an adaptive antenna comprising the steps of:

a) receiving an antenna training sequence;

b) based on said antenna training sequence, determining a bit error rate (BER) signal based on said received antenna training sequence;

c) determining a receive signal strength indication signal (RSSI) based on said received antenna training sequence;

d) determining if the BER signal is in a first logical relationship with a predetermined BER signal;

if yes, further determining whether the RSSI signal is in a second logical relationship with a predetermined RSSI signal;

if yes, asserting a VALID_-- DATA signal said VALID_-- DATA signal indicating that data transfer can be initiated;

else spatially steering an antenna array in a predetermined amount and proceeding to determination step c);

else proceeding to processing step c).

11. The method of claim 10 further comprising before step a) the steps of:

a) determining if an acquire command has been received;

b) if yes, proceeding to processing step c) of claim 10;

c) if no, proceeding to processing step a).

12. The method of claim 10 wherein the first logical relationship is when the BER signal is less than a predetermined BER signal.

13. The method of claim 10 wherein the second logical relationship is when the RSSI signal is greater than a predetermined RSSI signal.

14. The method of claim 10 wherein the predetermined BER signal is approximately 10^-5.

15. The method of claim 10 wherein the wherein the predetermined RSSI signal is approximately 20 dB.

16. A method of communicating data between a base station having an adaptive array antenna and a mobile unit comprising the steps of:

a) the base station transmitting an identification signal to the mobile unit;

b) the mobile unit transmitting an antenna training sequence to the base station;

c) the base station steering its adaptive array antenna to achieve a predetermined BER and a predetermined RSSI, wherein the step of steering includes the steps of;

i) determining a BER signal and an RSSI signal based on the antenna training sequence;

ii) comparing the BER signal to the predetermined BER signal;

iii) comparing the RSSI signal to the predetermined RSSI signal; and

,

iv) selectively controlling the adaptive array antenna based on whether the BER signal is in a first logical relationship with the predetermined BER signal and whether the RSSI signal is in a second logical relationship with the predetermined RSSI signal;

d) transporting valid data between the base station and the mobile unit;

e) determining whether the mobile unit is requesting communication;

if yes, the mobile unit transmitting a training sequence to the base station and proceeding to processing step c);

else proceeding at processing step e).

17. The method of claim 16 wherein the first logical relationship is when the BER signal is less than the predetermined BER signal.

18. The method of claim 16 wherein the second logical relationship is when the RSSI signal is greater than the predetermined RSSI signal.

19. The method of claim 16 wherein the predetermined BER signal is approximately 10^-5.

20. The method of claim 16 wherein the wherein the predetermined RSSI signal is approximately 20 dB.

21. A method for communicating data between a first base station and a second base station, said first and second base station each employing an adaptive antenna array, said method comprising the steps of:

a) a first base station transmitting an identification signal to a second base station;

b) a second base station transmitting an antenna training sequence to the first base station;

c) the first base station and the second base station each steering its adaptive array antenna to achieve a predetermined bit error rate (BER) and a predetermined RSSI, wherein the step of steering includes the steps of;

i) determining a BER signal and an RSSI signal based on the antenna training sequence;

ii) comparing the BER signal to the predetermined BER signal;

iii) comparing the RSSI signal to the predetermined RSSI signal; and

,

iv) selectively controlling the adaptive array antenna based on whether the BER signal is in a first logical relationship with the predetermined BER signal and whether the RSSI signal is in a second logical relationship with the predetermined RSSI signal;

d) transmitting valid data between the first base station and second data and second base station;

e) the first base station determining if the second base station is requesting communication;

if yes, the second base station transmitting the training sequence to the first base station,

else, proceeding to processing step d).

22. The method of claim 21 wherein the first logical relationship is when the BER signal is less than the predetermined BER signal.

23. The method of claim 21 wherein the second logical relationship is when the RSSI signal is greater than the predetermined RSSI signal.

24. The method of claim 21 wherein the predetermined BER signal is approximately 10^-5.

25. The method of claim 21 wherein the wherein the predetermined RSSI signal is approximately 20 dB.