Secure sounding arrangement

Abstract

Methods and apparatuses for arranging sounding symbol are provided. An example apparatus comprises memory; and processing circuitry coupled to the memory. The processing circuitry is configured to encode a sounding signal. The sounding signal comprises a plurality of sounding symbols, and the repetition of sounding symbols to be transmitted in sequence is avoided.

What is claimed is: 
     
         1 . An apparatus, comprising:
 a memory; and   a processing circuitry coupled to the memory, the processing circuity is configured to:
 encode a sounding signal, 
   wherein the sounding signal comprises a plurality of sounding symbols, the repetition of sounding symbols to be transmitted in sequence is avoided.   
     
     
         2 . The apparatus according to  claim 1 , wherein intra symbol repetition is avoided by applying zero-prefix for each sounding symbol, and wherein inter symbol repetition is avoided by applying masking sequence different from each other for each sounding symbol. 
     
     
         3 . The apparatus according to  claim 1 , wherein the apparatus comprises two or more antennas, each of the antennas is to transmit encoded sounding symbols based on the plurality of sounding symbols,
 wherein for each antenna, the encoded sounding symbols in different time slots are different,   wherein for each time slot, the encoded sounding symbols on the two or more antennas are repeated, with different global phases determined by a general phase matrix.   
     
     
         4 . The apparatus according to  claim 1 , wherein the sounding signal is encoded for two or more users and to be transmitted to the two or more users, wherein the sounding symbols for different users are transmitted over different time slots and/or over different frequencies. 
     
     
         5 . The apparatus according to  claim 4 , wherein all sounding symbols for a first user are followed by any sounding symbol for a second user. 
     
     
         6 . The apparatus according to  claim 4 , wherein the sounding symbols for different users are to be transmitted in an interleaved approach, wherein transmitting of the sounding symbols for different users comprising:
 transmitting a first number of sounding symbols for a first user;   transmitting a second number of sounding symbols for a second user;   transmitting a third number of sounding symbols for the first user; and   transmitting a fourth number of sounding symbols for the second user.   
     
     
         7 . The apparatus according to  claim 1 , wherein the processing circuity is further configured to:
 record the Time of Departure (ToD) information of the sounding signal;   obtain the Time of Arrival (ToA) information of the sounding signal from a receiving device;   calculate the distance between the apparatus and the receiving device based on at least the ToD information and the ToA information; and   encode an unlocking signal if the calculated distance is less than a predetermined threshold, to unlock a locked device.   
     
     
         8 . The apparatus according to  claim 1 , wherein the sounding signal is to be transmitted after transmitting Null Data Packet Announcement (NDPA), which is used to indicate the structure of the sounding signal to be transmitted. 
     
     
         9 . The apparatus according to  claim 1 , wherein the apparatus is any one of access point (AP), station, and cellular base station. 
     
     
         10 . The apparatus according to  claim 4 , wherein the apparatus is configured as an AP or cellular base station, and wherein the processing circuity is configured to:
 encode the sounding signal in response to an uplink sounding signal received from a station.   
     
     
         11 . A method performed by a wireless enabled apparatus, comprising:
 encoding a sounding signal,   wherein the sounding signal comprises a plurality of sounding symbols, the repetition of sounding symbols to be transmitted in sequence is avoided.   
     
     
         12 . The method according to  claim 11 , wherein the apparatus comprises two or more antennas, the method further comprising each of the antennas is to transmit encoded sounding symbols based on the plurality of sounding symbols,
 wherein for each antenna, the encoded sounding symbols in different time slots are different,   wherein for each time slot, the encoded sounding symbols on the two or more antennas are repeated, with different global phases determined by a general phase matrix.   
     
     
         13 . The method according to  claim 11 , further comprising encoding the sounding signal for two or more users and transmitting the encoded sounding signal to the two or more users,
 wherein the sounding symbols for different users are transmitted over different time slots and/or over different frequencies.   
     
     
         14 . The method according to  claim 13 , wherein all sounding symbols for a first user are followed by any sounding symbol for a second user. 
     
     
         15 . The method according to  claim 13 , wherein the sounding symbols for different users are to be transmitted in an interleaved approach, wherein transmitting of the sounding symbols for different users comprising:
 transmitting a first number of sounding symbol for a first user;   transmitting a second number of sounding symbol for a second user;   transmitting a third number of sounding symbol for the first user; and   transmitting a fourth number of sounding symbol for the second user.   
     
     
         16 . A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors of an apparatus result in performing operations comprising:
 encoding a sounding signal,   wherein the sounding signal comprises a plurality of sounding symbols, the repetition of sounding symbols to be transmitted in sequence is avoided.   
     
     
         17 . The non-transitory computer-readable medium of  claim 10 , wherein the apparatus comprises two or more antennas, the method further comprising each of the antennas is to transmit encoded sounding symbols based on the plurality of sounding symbols,
 wherein for each antenna, the encoded sounding symbols in different time slots are different,   wherein for each time slot, the encoded sounding symbols on the two or more antennas are repeated, with different global phases determined by a general phase matrix.   
     
     
         18 . The non-transitory computer-readable medium of  claim 10 , further comprising encoding the sounding signal for two or more users and transmitting the encoded sounding signal to the two or more users, wherein the sounding symbols for different users are transmitted over different time slots and/or over different frequencies. 
     
     
         19 . The non-transitory computer-readable medium of  claim 10 , wherein all sounding symbols for a first user are followed by any sounding symbol for a second user. 
     
     
         20 . The non-transitory computer-readable medium of  claim 10 , wherein the sounding symbols for different users are to be transmitted in an interleaved approach, wherein transmitting of the sounding symbols for different users comprising:
 transmitting a first number of sounding symbol for a first user;   transmitting a second number of sounding symbol for a second user;   transmitting a third number of sounding symbol for the first user; and   transmitting a fourth number of sounding symbol for the second user.