Method and apparatus for a synchronization channel in an OFDMA system
First Claim
1. A method for use in a base station in a wireless communication system wherein the base station has cell identification information associated therewith, the cell identification information associated with the base station comprising first and second partial cell identification information stored in a storage device thereof, the base station further including a synchronization channel generator for generating a synchronization channel signal, and transmitter circuitry for transmitting an orthogonal frequency domain multiple access (OFDMA) signal, the method comprising the steps of:
- the synchronization channel generator generating the synchronization channel signal comprising at least first and second synchronization channel signals, the first and second synchronization channel signals comprising respective first and second sets of one or more individual sequence elements, and wherein the first set of one or more individual sequence elements is generated based on a general chirp like (GCL) sequence with a sequence index of the GCL sequence defined in response to the first partial cell identification information stored in the storage device of the base station, and wherein the second set of one or more individual sequence elements is generated based on a cyclically shifted maximal length binary sequence with an amount of cyclic shift of the maximal length binary sequence defined in response to the second partial cell identification information stored in the storage device of the base station; and
the transmitter circuitry transmitting the OFDMA signal including the synchronization channel signal.
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Abstract
A method and apparatus is provided for transmitting an orthogonal frequency domain multiple access (OFDMA) signal including a synchronization channel signal transmitted within a localized portion of a bandwidth of the OFDMA signal (818), the synchronization channel signal having predetermined time domain symmetry within the localized portion of the bandwidth (816). The synchronization channel signal enables an initial acquisition and cell search method with low computational load which provides OFDMA symbol timing detection and frequency error detection by differential processing of sequence elements of the synchronization channel signal (1112) and frame boundary detection and cell specific information detection (1114) in an OFDMA system supporting multiple system bandwidths, both synchronized and un-synchronized systems, a large cell index and an OFDMA symbol structure with both short and long cyclic prefix length.
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Citations
12 Claims
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1. A method for use in a base station in a wireless communication system wherein the base station has cell identification information associated therewith, the cell identification information associated with the base station comprising first and second partial cell identification information stored in a storage device thereof, the base station further including a synchronization channel generator for generating a synchronization channel signal, and transmitter circuitry for transmitting an orthogonal frequency domain multiple access (OFDMA) signal, the method comprising the steps of:
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the synchronization channel generator generating the synchronization channel signal comprising at least first and second synchronization channel signals, the first and second synchronization channel signals comprising respective first and second sets of one or more individual sequence elements, and wherein the first set of one or more individual sequence elements is generated based on a general chirp like (GCL) sequence with a sequence index of the GCL sequence defined in response to the first partial cell identification information stored in the storage device of the base station, and wherein the second set of one or more individual sequence elements is generated based on a cyclically shifted maximal length binary sequence with an amount of cyclic shift of the maximal length binary sequence defined in response to the second partial cell identification information stored in the storage device of the base station; and the transmitter circuitry transmitting the OFDMA signal including the synchronization channel signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for use in a wireless communication device including receiver circuitry for receiving and demodulating an orthogonal frequency domain multiple access (OFDMA) signal including a synchronization channel signal and a controller for detecting the synchronization channel signal, the method comprising the steps of:
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the receiver circuitry receiving the OFDMA signal including the synchronization channel signal from a base station transmitting the OFDMA signal, the synchronization channel signal comprising a plurality of synchronization channel signal sequence elements, wherein cell identification associated with the base station transmitting the OFDMA signal comprising first and second partial cell identification information; the controller detecting first and second synchronization channel signals of the synchronization channel signal within the OFDMA signal, the first and second synchronization channel signals comprising respective first and second sets of one or more individual sequence elements, the first set of one or more individual sequence elements based on a generalized chirp like (GCL) sequence and the second set of one or more individual sequence elements based on a cyclically shifted maximal length binary sequence; and the controller further determining the first partial cell identification information in response to a sequence index of the GCL sequence of the first set of one or more individual sequence elements and determining the second partial cell identification information in response to an amount of cyclic shift of the maximal length binary sequence of the second set of one or more individual sequence elements. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification