Method and apparatus for pilot signal transmission
First Claim
Patent Images
1. A method for assigning a pilot sequence to communication units within a communication system, the method comprising the steps of:
- assigning a first communication unit a first pilot sequence, wherein the first pilot sequence is selected from a group of pilot sequences constructed from a set of Generalized Chirp-Like (GCL) sequences; and
assigning a second communication unit a second pilot sequence taken from the group of pilot sequences constructed from the set of GCL sequences, wherein the first and the second pilot sequences are constructed from the GCL sequences or from sequences resulting from taking a size- NG unitary transformation of the GCL sequences; and
the GCL sequences are generated as
Su=(au(0 )b,au(1)b,. . .,au(NG−
1)b),where b is any complex scalar of unit amplitude and
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Abstract
Pilot sequences are constructed from distinct “classes” of chirp sequences that have an optimal cross correlation property. Utilization of chirp sequences for pilot sequences results in pilot sequences that have optimal or nearly-optimal cross correlation and auto-correlation properties.
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Citations
28 Claims
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1. A method for assigning a pilot sequence to communication units within a communication system, the method comprising the steps of:
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assigning a first communication unit a first pilot sequence, wherein the first pilot sequence is selected from a group of pilot sequences constructed from a set of Generalized Chirp-Like (GCL) sequences; and assigning a second communication unit a second pilot sequence taken from the group of pilot sequences constructed from the set of GCL sequences, wherein the first and the second pilot sequences are constructed from the GCL sequences or from sequences resulting from taking a size- NG unitary transformation of the GCL sequences; and
the GCL sequences are generated as
Su=(au(0 )b,au(1)b,. . .,au(NG−
1)b),where b is any complex scalar of unit amplitude and - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. A method for assigning a pilot sequence to communication units within a communication system, the method comprising the steps of:
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assigning a first communication unit a first pilot sequence, wherein the first pilot sequence is selected from a group of pilot sequences constructed from a set of Generalized Chirp-Like (GCL) sequences; assigning a second communication unit a second pilot sequence taken from the group of pilot sequences constructed from the set of GCL sequences, wherein prior to assigning the first and the second communication units the first and the second pilot sequences, performing the step of determining a length of the pilot sequences (NG) based on a number of pilot sequences needed in the communication system (K) and a desired pilot sequence length (Np); further comprising the step of; choosing NG to be a smallest integer that is greater than Np and whose minimum prime factor excluding “
1”
is larger than K and generating the set of GCL sequences by truncating sequences in the set to Np;
orchoosing NG to be a largest integer that is smaller than Np and whose minimum prime factor excluding “
1”
is larger than K, and generating the set of GCL sequences set by repeating beginning elements of each sequence in the set to append at an end of each sequence to reach the desired length Np.
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10. A method comprising the steps of:
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receiving a pilot sequence as part of an over-the-air transmission, wherein the pilot sequence is constructed from a set of Generalized Chirp-Like (GCL) sequences and is assigned to either a base unit or a remote unit, wherein the pilot sequence is based on a truncated GCL sequence or a cyclically extended GCL sequence; and utilizing the pilot sequence for at least one of the following; acquisition and tracking of timing and frequency synchronization, estimation and tracking of desired channels for subsequent demodulation and decoding, estimation and monitoring of characteristics of other channels for handoff purposes, and interference suppression; wherein the step of receiving the pilot sequence comprises the step of receiving the pilot sequence constructed from GCL sequences or from sequences resulting from taking a size-NG unitary transformation of the GCL sequences, and the GCL sequences are generated as
Su=(au(0)b, au(1)b,. . . ,au(NG-1)b),where b is any complex scalar of unit amplitude and - View Dependent Claims (11, 12)
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13. A communication unit comprising:
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pilot channel circuitry for transmitting or receiving a first pilot channel sequence, wherein the first pilot channel sequence comprises a sequence from a group of pilot sequences constructed from a set of Generalized Chirp-Like (GCL) sequences and wherein the pilot channel circuitry is further for transmitting or receiving a second pilot channel sequence taken from the group of pilot sequences constructed from the set of GCL sequences and wherein the GCL sequence is equal to
Su=(au(0)b,au(1)b,. . . ,au(NG-1)b),where b is a complex scalar of unit amplitude and - View Dependent Claims (14, 15)
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16. A method for assigning a pilot sequence to communication units within a communication system, the method comprising the steps of:
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assigning a first communication unit a first pilot sequence, wherein the first pilot sequence is selected from a group of pilot sequences constructed from a set of Generalized Chirp-Like (GCL) sequences; and assigning a second communication unit a second pilot sequence taken from the group of pilot sequences constructed from the set of GCL sequences, wherein at least one of the following characteristics applies; the first pilot sequence is constructed from a Generalized Chirp-Like (GCL) sequence of a first class and the second pilot sequence is constructed from a Generalized Chirp-Like (GCL) sequence of a second class, the second pilot sequence is based on a function of the first sequence and wherein the function of the first sequence is based on at least one of circular shifting of the first sequence and rotating the phase of elements of the first sequence, the first pilot sequence is of length NP, and is based on a truncation of a length NG Generalized Chirp-Like (GCL) sequence where NG is the smallest prime number that is larger than NP, or the first pilot sequence is of length NP, and is based on an extension of a length NG Generalized Chirp-Like (GCL) sequence where NG is the largest prime number that is smaller than NP and the extension is based on appending a repetition of the beginning elements of the GCL sequence to the end to reach the length NP. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for assigning a pilot sequence to communication units within a communication system, the method comprising the steps of:
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assigning a first communication unit a first pilot sequence, wherein the first pilot sequence is selected from a group of pilot sequences constructed from a set of Generalized Chirp-Like (GCL) sequences; and assigning a second communication unit a second pilot sequence taken from the group of pilot sequences constructed from the set of GCL sequences, wherein the first pilot sequence is based on a cyclically extended Generalized Chirp-Like (GCL) sequence, wherein assigning the first communication unit the first pilot sequence comprises assigning the first communication unit a pilot sequence constructed from a class-u1 GCL sequence and wherein assigning the second communication unit the second pilot sequence comprises assigning the second communication unit a pilot sequence constructed from a class-u2 GCL sequence that satisfies the requirement of |U1-U2| being relatively prime to NG., where NG is a length of the GCL sequence from which the first pilot sequence is constructed.
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Specification