EP1065825A2
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Time division duplex synchronization
Assignee: Texas Instruments Inc
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Filing: 2000-06-27
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Granted: —
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Expires: 2020-06-27
Abstract
Abstract Synchronization in time division duplex mode spread spectrum communications systems using comma-free codes with components made of QPSK-modulated secondary synchronization codes.
Inventors
- 👤 Srinath Hosur
- 👤 Anand G. Dabak
- 👤 Sundararajan Sriram
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 18:19
CPC Classifications
H; H04; H04J; H04J13/00; H04L; H04L5/00; H04L5/14; H04L5/1469; H04L5/1484
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
27 words
A method for time division duplex communications synchronization, comprising: (a) detecting a comma-free codeword component in a synchronization channel
time slot; and (b) decoding said codeword component.
Claim 2
Dependent Claim
17 words
The method of claim 1, wherein: (a) said codeword component is a combination of QPSK-modulated
synchronization codes.
Claim 3
Dependent Claim
27 words
The method of claim 2, wherein: (a) said combination is selected from one of Figures 1b, 6, and 7a in which C n denotes a synchronization code.
Claim 4
Dependent Claim
39 words
A mobile receiver in a time division duplex communication system, comprising: (a) a synchronization channel detector operable to detect comma-free
codeword components in a received signal; and (b) a decoder for said codeword components and coupled to said detector.
Claim 5
Dependent Claim
27 words
The mobile receiver of claim 4, wherein: (a) said detector includes a programmable processor with programming to
detect said codeword components as combinations of QPSK-modulated
synchronization codes.
Claim 6
Dependent Claim
28 words
The mobile receiver of claim 5, wherein: (a) said combinations are selected from one of Figures 1b, 6, and 7a in which
C n denotes a synchronization code.
Claim 7
Independent Claim
30 words
A method for time division duplex communications synchronization, comprising: (a) transmitting comma-free codeword components in synchronization channel
time slots; wherein (b) said codeword components at least partially identify a transmitter.
Claim 8
Dependent Claim
16 words
The method of claim 7, wherein: (a) said codeword components are combinations of QPSK-modulated
synchronization codes.
Claim 9
Dependent Claim
32 words
The method of claim 8, wherein: (a) said combinations are selected from one of the rows of one of Figures 1b, 6,
and 7a in which C n denotes a synchronization code.
Claim 10
Dependent Claim
35 words
A base station in a time division duplex communications system, comprising: (a) a transmitter for comma-free codeword components in synchronization
channel time slots; wherein (b) said codeword components at least partially identify the base station.
References Cited (Backward Citations)
No citation records indexed.
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