Path search method, channel estimation method and communication device
First Claim
1. A path search method for detecting timings of path components included in a signal received via a multipath propagation path, said method comprising:
- a first path search step detecting the timings of the path components using pilot symbols of a known phase included in said signal received via the multipath propagation path; and
a second path search step detecting the timings of the path components using information symbols that are derived from a signal demodulated according to said timings detected in the first path search step and said pilot symbols of the known phase.
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Abstract
A communication device includes at least one of path search means for detecting respective timings of path components included a signal received via a multipath propagation path using pilot symbols of a known phase included in said received signal and channel estimation means for estimating channel variation using the pilot symbols. The path search means includes a first path search part for detecting respective timings of path components using pilot symbols and a second path search part for detecting respective timings of path components using information symbols derived from a signal demodulated according to the timings detected in the first path search part and pilot symbols. The channel estimation means includes a pilot symbol acquiring part for acquiring pilot symbols included in the received signal and a channel estimation part for implementing channel estimation using the acquired pilot symbols.
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Citations
19 Claims
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1. A path search method for detecting timings of path components included in a signal received via a multipath propagation path, said method comprising:
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a first path search step detecting the timings of the path components using pilot symbols of a known phase included in said signal received via the multipath propagation path; and a second path search step detecting the timings of the path components using information symbols that are derived from a signal demodulated according to said timings detected in the first path search step and said pilot symbols of the known phase. - View Dependent Claims (2, 3, 4, 5)
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6. A channel estimation method for estimating channel variation using pilot symbols by detecting timings of path components included in a signal received via a multipath propagation path, said method comprising:
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a first path search step detecting the timings of the path components using pilot symbols of a known phase in said signal received via the multipath propagation path; a first channel estimation step estimating the channel variation using the pilot symbols of the known phase, after said first path search step; a second path search step detecting the timings of the path components using the timings detected in said first path search step, information symbols that are derived from a signal demodulated according to said first channel estimation step, and the pilot symbols of the known phase; and a second channel estimation step estimating the channel variation using the information symbols that are derived from the signal demodulated according to said first channel estimation step, and the pilot symbols of the known phase, according to the timings detected in said second path search step. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A communication device for implementing a path search that detects timings of path components included in a signal received via a multipath propagation path, said device comprising:
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a first path search part configured to detect the timings of the path components using pilot symbols of a known phase included in said signal received via the multipath propagation path; and a second path search part configured to detect the timings of the path components using information symbols that are derived from a signal demodulated according to said timings detected in the first path search part and said pilot symbols of the known phase. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A communication device comprising:
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a path search and channel estimation part configured to carry out a path search and a channel estimation using pilot symbols of a known phase included in a signal received via a multipath propagation path and information symbols; and a feedback part configured to feed back said information symbols, wherein said path search and channel estimation part recursively implements the path search and the channel estimation by repeating processes of implementing a path search using information symbols that are decoded after a channel estimation and the pilot symbols and implementing a channel estimation using the information symbols that are fed back via said feedback part in accordance with a timing detected in said path search and the pilot symbols.
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Specification