Preamble capture and medium access control
First Claim
Patent Images
1. An apparatus for wireless communications, comprising:
- a wireless interface configured to receive simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; and
a searcher configured to;
acquire the reference signals;
distinguish between the wireless devices by comparing information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium;
determine the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; and
based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus and method for wireless communications configured to receive simultaneous transmissions from a plurality of wireless devices, with each of the transmissions having a reference signal, acquire the reference signals and, based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding.
151 Citations
48 Claims
-
1. An apparatus for wireless communications, comprising:
-
a wireless interface configured to receive simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; and a searcher configured to; acquire the reference signals; distinguish between the wireless devices by comparing information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium; determine the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; and based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method of wireless communications, comprising:
-
receiving simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; acquiring the reference signals; distinguishing between the wireless devices by comparing information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium; determining the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; and selecting the transmission from one of the wireless devices for timing synchronization and decoding based on information obtained from the acquisition of the reference signals. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
-
31. An apparatus for wireless communications, comprising:
-
means for receiving simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; means for acquiring the reference signals; means for distinguishing between the wireless devices by comparing information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium; means for determining the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; and means for selecting the transmission from one of the wireless devices for timing synchronization and decoding based on information obtained from the acquisition of the reference signals. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
-
-
45. A non-transitory computer-readable medium embodied as a computer-program product for wireless communications comprising simultaneous transmissions received from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal, the computer-program product, comprising:
- codes executable by at least one processor to;
acquire the reference signals; distinguish between the wireless devices by comparing the information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium; determine the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; and select the transmission from one of the wireless devices for timing synchronization and decoding based on information obtained from the acquisition of the reference signals.
- codes executable by at least one processor to;
-
46. A headset, comprising:
-
a wireless interface configured to receive simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; a searcher configured to; acquire the reference signals; distinguish between the wireless devices by comparing the information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium; determine the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding; and a transducer configured to provide an audio output based on the selected transmission.
-
-
47. A watch comprising:
-
a wireless interface configured to receive simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; a searcher configured to; acquire the reference signals; distinguish between the wireless devices by comparing the information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium; determine the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; and based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding; and a user interface configured to provide an indication based on the selected transmission.
-
-
48. A sensing device for wireless communications, comprising:
-
a wireless interface configured to receive simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; a searcher configured to; acquire the reference signals; distinguish between the wireless devices by comparing the information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium; determine the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; and based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding; and a sensor configured to provide data to the wireless interface for transmission.
-
Specification