System and method extending range of a wireless network

• US 10,499,346 B2
• Filed: 03/20/2019
• Issued: 12/03/2019
• Est. Priority Date: 04/03/2018
• Status: Active Grant

• Current Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Original Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Inventors: Sood, Ayush, Nimmala, Ashok, G, Kempraju, Medapalli, Kamesh
• Primary Examiner(s): Trinh, Tan H
• Application Number:
  US16/359,714
• Publication Number:
  US 20190306806A1
• Time in Patent Office: 258 Days
• Field of Search: 455 69, 455522, 455 631, 4555531, 370252, 370329, 370338
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

A system and method are provided for extending range of devices in a legacy wireless network. Generally, the method involves providing in a transmitter of the system a frame having a first field including a number of preamble segments and a second field including a number of data segments. The transmitter in the system is then operated to transmit at least one of the preamble segments with at least a first transmit power, and to transmit the segments of the second field at a second transmit power, wherein the first transmit power is greater than the second transmit power. Other embodiments are also described.

Claims

1. A method comprising:

providing in a transmitter of a station in a wireless network a frame having a first field including a number of preamble segments and a second field including a number of data segments;

operating the transmitter to transmit at least one of the number of preamble segments of the frame with at least a first transmit power, and to transmit the data segments of the second field of the frame at a second transmit power, wherein the first transmit power is greater than the second transmit power; and

after operating the transmitter to transmit at least one of the number of preamble segments with at least the first transmit power;

determining whether the transmitted frame has been detected by an access point in the wireless network, and

if the transmitted frame has not been detected, re-transmitting the frame while operating the transmitter to transmit at least one of the number of preamble segments with an incrementally increased transmit power until a determination that the frame has been detected by the access point or a predetermined maximum transmit power is reached.

2. The method of claim 1 further comprising before operating the transmitter to transmit at least one of the number of preamble segments with at least a first transmit power greater than the second transmit power enabling a preamble boost circuit in the transmitter based on a predetermined low received transmit power indication (RSSI) or a predetermined high signal to noise ratio (SNR) of a received signal from another station (STA) or access point (AP) in the wireless network, or on a determination that a specified frame has not been received by the STA or AP.

3. The method of claim 1 wherein the first transmit power is selected based on a period of the at least one of the preamble segment transmitted therewith to comply with a regulated maximum average power.

4. The method of claim 1 wherein operating the transmitter to transmit at least one of the preamble segments with at least a first transmit power comprises operating the transmitter to transmit a plurality of preamble segments, wherein a transmit power of each of the plurality of preamble segments is independent of the transmit power of other preamble segments.

5. The method of claim 1 wherein the transmitter includes preamble boost circuitry coupled to a radio frequency (RF) amplifier and including a number of switching circuits to select between a boosted and non-boosted RF gain for each of the number of preamble segments, and wherein operating the transmitter to transmit at least one of the number of preamble segments with at least a first transmit power greater than the second transmit power comprises adjusting a gain of the RF amplifier on a per field basis.

6. The method of claim 5 wherein operating the transmitter to transmit at least one of the number of preamble segments with at least a first transmit power greater than the second transmit power further comprises adjusting a gain of the RF amplifier when transmitting the number of preamble segments on a per segment basis.

7. The method of claim 1 wherein the transmitter includes preamble boost circuitry coupled to a digital signal path in the transmitter and including a number of switching circuits to select between boosted and non-boosted scale factor for each of the number of preamble segments, and wherein operating the transmitter to transmit at least one of the number of preamble segments with at least a first transmit power greater than the second transmit power comprises summing at least one of the preamble segments with a boosted scale factor prior to digitally processing and transmitting the preamble segment.

8. The method of claim 1 wherein the frame is formatted using a pre-802.11ax protocol, and wherein the number preamble segments comprise one or more of a legacy short training field (LSTF), a legacy long training field (LLTF), and a legacy signal field (LSIG).

9. An integrated circuit (IC) comprising:

a transmitter configured to transmit a frame in a wireless network in a format using a frame having a first field including a number of preamble segments and a second field including a number of data segments,

wherein the transmitter comprises preamble boost circuitry configured to transmit at least one of the number of preamble segments with at least a first transmit power, and to transmit the data segments of the second field at a second transmit power, wherein the first transmit power is greater than the second transmit power; and

processing logic to determine whether a transmitted frame has been received by an access point in the wireless network, and wherein the transmitter is further configured to, if the transmitted frame has not been received, re-transmit the frame wherein at least one of the number of preamble segments it transmitted with a third transmit power greater than the first transmit power.

10. The IC of claim 9 wherein the transmitter is further configured to transmit a plurality of preamble segments, wherein a transmit power of each of the plurality of preamble segments is independent of the transmit power of other preamble segments.

11. The IC of claim 9 wherein the preamble boost circuitry is coupled to a radio frequency (RF) amplifier in the transmitter and includes a number of switching circuits to select between a boosted and non-boosted RF gain for each of the number of preamble segments, and wherein the preamble boost circuitry is configured to adjust a gain of the RF amplifier on a per field basis.

12. The IC of claim 11 wherein the preamble boost circuitry is further configured to adjust the gain of the RF amplifier when transmitting the number of preamble segments on a per segment basis.

13. The IC of claim 9 wherein the preamble boost circuitry is coupled to a digital signal path in the transmitter and includes a number of switching circuits to select between boosted and non-boosted scale factor for each of the number of preamble segments, and wherein the transmitter is configured to sum at least one of the preamble segments in the digital signal path with a boosted scale factor selected by the preamble boost circuitry prior to digitally processing and transmitting the preamble segment.

14. A system comprising:

one more antennas; and

an integrated circuit (IC) comprising;

a transmitter coupled to the antenna, the transmitter configured to transmit a frame in a wireless network in a format using a frame having a first field including a number of preamble segments and a second field including a number of data segments, wherein the transmitter comprises preamble boost circuitry configured to transmit at least one of the number of preamble segments with at least a first transmit power, and to transmit the data segments of the second field at a second transmit power, and wherein the first transmit power is greater than the second transmit power; and

processing logic to determine whether a transmitted frame has been received by an access point in the wireless network, and wherein the transmitter is further configured to, if the transmitted frame has not been received, re-transmit the frame wherein at least one of the number of preamble segments it transmitted with a third transmit power greater than the first transmit power.

15. The system of claim 14 wherein the transmitter is further configured to transmit a plurality of preamble segments, wherein a transmit power of each of the plurality of preamble segments is independent of the transmit power of other preamble segments.

16. The system of claim 14 wherein the preamble boost circuitry is coupled to a radio frequency (RF) amplifier in the transmitter and includes a number of switching circuits to select between a boosted and non-boosted RF gain for each of the number of preamble segments, and wherein the preamble boost circuitry is configured to adjust a gain of the RF amplifier on a per field and a per segment basis.

17. The system of claim 14 wherein the preamble boost circuitry is coupled to a digital signal path in the transmitter and includes a number of switching circuits to select between boosted and non-boosted scale factor for each of the number of preamble segments, and wherein the transmitter is configured to sum at least one of the preamble segments in the digital signal path with a boosted scale factor selected by the preamble boost circuitry prior to digitally processing and transmitting the preamble segment.