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US 7,609,752 B2Granted
Transmitter and transmission control method used in random access communication environment
AssigneeNtt Docomo, Inc.
InventorsHiromasa Fujii, Hitoshi Yoshino, Takatoshi Sugiyama
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Abstract
A transmitter comprises a frequency utilization status detector configured to detect the utilization status of an allocated frequency band based on a received signal, a symbol placement determination unit configured to determine placement of pilot symbols based on the detected status of frequency utilization, and a symbol placement unit configured to place the pilot symbols according to the determined symbol placement.
Claims24
A transmitter comprising:
- a frequency utilization status detector configured to detect utilization status of an allocated frequency band based on a received signal;
- a symbol placement determination unit configured to determine placement of pilot symbols based on the detected status of the frequency utilization;
- a symbol placement unit configured to place the pilot symbols according to the determined symbol placement;
- and
- a synchronization timing detector configured to detect a synchronization timing based on the received signal,
- wherein the frequency utilization status detector detects the utilization status of the allocated frequency band based on the synchronization timing.
3 more elements
A transmission control method comprising:
- receiving a signal from a transmitter that is currently conducting radio communications nearby;
- detecting the utilization status of an allocated frequency band based on the received signal;
- determining placement of pilot symbols based on the detected utilization status;
- placing the pilot symbols based on the determination result;
- and
- detecting a synchronization timing based on the received signal, the detection of the utilization status of the allocated frequency band being carried out based on the synchronization timing.
3 more elements
Dependencies are inferred from the claim text.