POSITIONING USING IS-95 CDMA SIGNALS
Apparatus having corresponding methods and computer-readable media comprise a receiver to receive a wireless Code Division Multiple Access (CDMA) signal comprising a continuously transmitted pseudonoise sequence; and a pseudorange unit to determine a pseudorange based on the wireless CDMA signal; wherein a location of the receiver is determined based on the pseudorange and a location of a transmitter of the wireless CDMA signal.
1 . An apparatus comprising:
a receiver to receive a wireless Code Division Multiple Access (CDMA) signal comprising a continuously transmitted pseudonoise sequence; and
a pseudorange unit to determine a pseudorange based on the wireless CDMA signal;
wherein a location of the receiver is determined based on the pseudorange and a location of a transmitter of the wireless CDMA signal.
2 . The apparatus of claim 1 , wherein the wireless CDMA signal comprises at least one of:
an Interim Standard 95 (IS-95) signal; and
a cdma2000 signal.
3 . The apparatus of claim 1 , further comprising:
a location unit to determine the location of the receiver based on the pseudorange and the location of the transmitter of the wireless CDMA signal.
4 . The apparatus of claim 1 , wherein the wireless CDMA signal comprises a pilot channel comprising a short code sequence:
wherein the pseudorange unit determines the pseudorange based on the short code sequence.
5 . The apparatus of claim 1:
wherein the receiver receives a plurality of the wireless CDMA signals, wherein each of the wireless CDMA signals comprises a pilot channel comprising a short code sequence, wherein each of the short code sequences has a different offset index; and
wherein the pseudorange unit identifies a respective transmitter for each of the wireless CDMA signals based on the respective offset indexes of the short code sequences.
6 . The apparatus of claim 5 , further comprising:
a time transfer unit to receive an indication of absolute time;
wherein the pseudorange unit determines the offset indexes of the short code sequences based on the absolute time.
7 . The apparatus of claim 5:
wherein the pseudorange unit determines differences between the offset indexes of the short code sequences, and identifies the respective transmitter for each of the wireless CDMA signals based on the differences between the offset indexes.
8 . The apparatus of claim 7:
wherein the pseudorange unit identifies the respective transmitter for each of the wireless CDMA signals based on a database of the differences between the offset indexes.
9 . The apparatus of claim 5 , further comprising:
a wireless CDMA decoder to identify at least one of the transmitters of the wireless CDMA signals based on transmitter identifiers encoded into the respective wireless CDMA signals.
10 . An apparatus comprising:
receiver means for receiving a wireless Code Division Multiple Access (CDMA) signal comprising a continuously transmitted pseudonoise sequence; and
pseudorange means for determining a pseudorange based on the wireless CDMA signal;
wherein a location of the receiver means is determined based on the pseudorange and a location of a transmitter of the wireless CDMA signal.
11 . The apparatus of claim 10 , wherein the wireless CDMA signal comprises at least one of:
an Interim Standard 95 (IS-95) signal; and
a cdma2000 signal.
12 . The apparatus of claim 10 , further comprising:
location means for determining the location of the receiver based on the pseudorange and the location of the transmitter of the wireless CDMA signal.
13 . The apparatus of claim 10 , wherein the wireless CDMA signal comprises a pilot channel comprising a short code sequence:
wherein the pseudorange means determines the pseudorange based on the short code sequence.
14 . The apparatus of claim 10:
wherein the receiver means receives a plurality of the wireless CDMA signals, wherein each of the wireless CDMA signals comprises a pilot channel comprising a short code sequence, wherein each of the short code sequences has a different offset index; and
wherein the pseudorange means identifies a respective transmitter for each of the wireless CDMA signals based on the respective offset indexes of the short code sequences.
15 . The apparatus of claim 14 , further comprising:
time transfer means for receiving an indication of absolute time;
wherein the pseudorange means determines the offset indexes of the short code sequences based on the absolute time.
16 . The apparatus of claim 14:
wherein the pseudorange means determines differences between the offset indexes of the short code sequences, and identifies the respective transmitter for each of the wireless CDMA signals based on the differences between the offset indexes.
17 . The apparatus of claim 16:
wherein the pseudorange means identifies the respective transmitter for each of the wireless CDMA signals based on a database of the differences between the offset indexes.
18 . The apparatus of claim 14 , further comprising:
decoder means for identifying at least one of the transmitters of the wireless CDMA signals based on transmitter identifiers encoded into the respective wireless CDMA signals.
19 . A method comprising:
receiving, at a receiver, a wireless Code Division Multiple Access (CDMA) signal comprising a continuously transmitted pseudonoise sequence; and
determining a pseudorange based on the wireless CDMA signal;
wherein a location of the receiver is determined based on the pseudorange and a location of a transmitter of the wireless CDMA signal.
20 . The method of claim 19 , wherein the wireless CDMA signal comprises at least one of:
an Interim Standard 95 (IS-95) signal; and
a cdma2000 signal.
21 . The method of claim 19 , further comprising:
determining the location of the receiver based on the pseudorange and the location of the transmitter of the wireless CDMA signal.
22 . The method of claim 19 , wherein the wireless CDMA signal comprises a pilot channel comprising a short code sequence:
wherein the pseudorange means determines the pseudorange based on the short code sequence.
23 . The method of claim 19 , further comprising:
receiving a plurality of the wireless CDMA signals, wherein each of the wireless CDMA signals comprises a pilot channel comprising a short code sequence, wherein each of the short code sequences has a different offset index; and
identifying a respective transmitter for each of the wireless CDMA signals based on the respective offset indexes of the short code sequences.
24 . The method of claim 23 , further comprising:
receiving an indication of absolute time; and
determining the offset indexes of the short code sequences based on the absolute time.
25 . The method of claim 23 , further comprising:
determining differences between the offset indexes of the short code sequences; and
identifying the respective transmitter for each of the wireless CDMA signals based on the differences between the offset indexes.
26 . The method of claim 25 , further comprising:
identifying the respective transmitter for each of the wireless CDMA signals based on a database of the differences between the offset indexes.
27 . The method of claim 23 , further comprising:
identifying at least one of the transmitters of the wireless CDMA signals based on transmitter identifiers encoded into the respective wireless CDMA signals.
28 . Computer-readable media embodying instructions executable by a computer to perform a method comprising:
receiving, at a receiver, a wireless Code Division Multiple Access (CDMA) signal comprising a continuously transmitted pseudonoise sequence; and
determining a pseudorange based on the wireless CDMA signal;
wherein a location of the receiver is determined based on the pseudorange and a location of a transmitter of the wireless CDMA signal.
29 . The computer-readable media of claim 28 , wherein the wireless CDMA signal comprises at least one of:
an Interim Standard 95 (IS-95) signal; and
a cdma2000 signal.
30 . The computer-readable media of claim 28 , wherein the method further comprises:
determining the location of the receiver based on the pseudorange and the location of the transmitter of the wireless CDMA signal.
31 . The computer-readable media of claim 28 , wherein the wireless CDMA signal comprises a pilot channel comprising a short code sequence:
wherein the pseudorange means determines the pseudorange based on the short code sequence.
32 . The computer-readable media of claim 28 , wherein the method further comprises:
receiving a plurality of the wireless CDMA signals, wherein each of the wireless CDMA signals comprises a pilot channel comprising a short code sequence, wherein each of the short code sequences has a different offset index; and
identifying a respective transmitter for each of the wireless CDMA signals based on the respective offset indexes of the short code sequences.
33 . The computer-readable media of claim 32 , wherein the method further comprises:
receiving an indication of absolute time; and
determining the offset indexes of the short code sequences based on the absolute time.
34 . The computer-readable media of claim 32 , wherein the method further comprises:
determining differences between the offset indexes of the short code sequences; and
identifying the respective transmitter for each of the wireless CDMA signals based on the differences between the offset indexes.
35 . The computer-readable media of claim 34 , wherein the method further comprises:
identifying the respective transmitter for each of the wireless CDMA signals based on a database of the differences between the offset indexes.
36 . The computer-readable media of claim 32 , wherein the method further comprises:
identifying at least one of the transmitters of the wireless CDMA signals based on transmitter identifiers encoded into the respective wireless CDMA signals.