Cyclic shift delay techniques for WLAN multi-radio devices
View Patent ↗The present disclosure includes systems and techniques relating to wireless local area network devices. A described technique includes configuring separate radio pathways, which are operable for either contiguous or non-contiguous frequency transmissions, to collectively produce a composite signal in a contiguous frequency mode; generating, via first and second radio pathways, first and second frequency segments of the composite signal in accordance with a segment bandwidth, the second frequency segment being contiguous with the first frequency segment in a frequency domain; applying, via the first and second radio pathways, first and second cyclic shift delay (CSD) phase shifts to the first and second frequency segments to produce first and second output signals, respectively. The first and second CSD phase shifts are equivalent to CSD phase shifts that correspond to a contiguous non-composite signal having a single frequency segment.
1. A method comprising:
configuring separate radio pathways, including a first radio pathway and a second radio pathway that are operable for either contiguous frequency transmissions or non-contiguous frequency transmissions, to collectively produce a composite signal in a contiguous frequency mode;
generating, via the first radio pathway, a first frequency segment of the composite signal in accordance with a segment bandwidth;
generating, via the second radio pathway, a second frequency segment of the composite signal in accordance with the segment bandwidth, the second frequency segment being contiguous with the first frequency segment in a frequency domain;
applying, via the first radio pathway, first cyclic shift delay (C SD) phase shifts to the first frequency segment to produce a first output signal;
applying, via the second radio pathway, second CSD phase shifts to the second frequency segment to produce a second output signal; and
transmitting the composite signal by transmitting signals comprising the first output signal and the second output signal,
wherein the first CSD phase shifts and the second CSD phase shifts are equivalent to third CSD phase shifts that correspond to a contiguous non-composite signal having a single frequency segment,
wherein a bandwidth of the single frequency segment is equal to twice the segment bandwidth, and
wherein the first CSD phase shifts and the second CSD phase shifts are applied such that a device receiving the composite signal uses the third CSD phase shifts that correspond to the contiguous non-composite signal.
2. The method of claim 1 , wherein configuring the radio pathways comprises setting, in the first radio pathway, a first CSD offset for the first frequency segment, wherein the first CSD phase shifts are based on the first CSD offset.
3. The method of claim 2 , wherein configuring the radio pathways comprises setting, in the second radio pathway, a second CSD offset for the second frequency segment, wherein the second CSD phase shifts are based on the second CSD offset.
4. The method of claim 1 , wherein a composite bandwidth of the composite signal is equal to twice the segment bandwidth, and wherein the composite bandwidth is 160 MHz.
5. The method of claim 1 , wherein the segment bandwidth is 80 MHz.
6. The method of claim 1 , further comprising:
transmitting an indicator to provide information regarding an application of CSD phase shifts to the composite signal.
7. An apparatus, comprising:
a first radio unit that is operable for either contiguous frequency transmissions or non-contiguous frequency transmissions, the first radio unit being configured to
generate a first frequency segment of a composite signal in accordance with a segment bandwidth, and
apply first cyclic shift delay (CSD) phase shifts to the first frequency segment to produce a first output signal;
a second radio unit that is operable for either contiguous frequency transmissions or non-contiguous frequency transmissions, the second radio unit being configured to
generate a second frequency segment of the composite signal in accordance with the segment bandwidth, and
apply second CSD phase shifts to the second frequency segment to produce a second output signal, the second frequency segment being contiguous with the first frequency segment in a frequency domain; and
processor electronics configured to control the radio units to collectively produce the composite signal in a contiguous frequency mode,
wherein the first CSD phase shifts and the second CSD phase shifts are equivalent to third CSD phase shifts that correspond to a contiguous non-composite signal having a single frequency segment,
wherein a bandwidth of the single frequency segment is equal to twice the segment bandwidth, and
wherein the first CSD phase shifts and the second CSD phase shifts are applied such that a device receiving the composite signal uses the third CSD phase shifts that correspond to the contiguous non-composite signal.
8. The apparatus of claim 7 , wherein the processor electronics are configured to set, within the first radio unit, a first CSD offset for the first frequency segment, wherein the first CSD phase shifts are based on the first CSD offset.
9. The apparatus of claim 7 , wherein the processor electronics are configured to set, within the second radio unit, a second CSD offset for the second frequency segment, wherein the second CSD phase shifts are based on the second CSD offset.
10. The apparatus of claim 7 , wherein a composite bandwidth of the composite signal is equal to twice the segment bandwidth, and wherein the composite bandwidth is 160 MHz.
11. The apparatus of claim 7 , wherein the segment bandwidth is 80 MHz.
12. The apparatus of claim 7 , wherein the processor electronics are configured to control a transmission of an indicator to provide information regarding an application of CSD phase shifts to the composite signal.
13. A system, comprising:
a first radio unit that is operable for either contiguous frequency transmissions or non-contiguous frequency transmissions, the first radio unit being configured to
generate a first frequency segment of a composite signal in accordance with a segment bandwidth, and
apply first cyclic shift delay (CSD) phase shifts to the first frequency segment to produce a first output signal;
a second radio unit that is operable for either contiguous frequency transmissions or non-contiguous frequency transmissions, the second radio unit being configured to
generate a second frequency segment of the composite signal in accordance with the segment bandwidth, and
apply second CSD phase shifts to the second frequency segment to produce a second output signal, the second frequency segment being contiguous with the first frequency segment in a frequency domain;
circuitry to produce the composite signal based on a summation of i) the first output signal and ii) the second output signal, and distribute the composite signal to one or more antenna interfaces; and
processor electronics configured to control the radio units to collectively produce the composite signal in a contiguous frequency mode,
wherein the first CSD phase shifts and the second CSD phase shifts are equivalent to third CSD phase shifts that correspond to a contiguous non-composite signal having a single frequency segment,
wherein a bandwidth of the single frequency segment is equal to twice the segment bandwidth, and
wherein the first CSD phase shifts and the second CSD phase shifts are applied such that a device receiving the composite signal uses the third CSD phase shifts that correspond to the contiguous non-composite signal.
14. The system of claim 13 , wherein the processor electronics are configured to set, within the first radio unit, a first CSD offset for the first frequency segment, wherein the first CSD phase shifts are based on the first CSD offset.
15. The system of claim 14 , wherein the processor electronics are configured to set, within the second radio unit, a second CSD offset for the second frequency segment, wherein the second CSD phase shifts are based on the second CSD offset.
16. The system of claim 13 , wherein a composite bandwidth of the composite signal is equal to twice the segment bandwidth, and wherein the composite bandwidth is 160 MHz.
17. The system of claim 13 , wherein the segment bandwidth is 80 MHz.
18. The system of claim 13 , wherein the processor electronics are configured to control a transmission of an indicator to provide information regarding an application of CSD phase shifts to the composite signal.