Wireless communication system, transmitting device and receiving device

• US 8,867,444 B2
• Filed: 04/30/2012
• Issued: 10/21/2014
• Est. Priority Date: 03/17/2006
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Mizusawa, Hitoshi
• Primary Examiner(s): Ly, Nghi H
• Application Number:
  US13/460,095
• Publication Number:
  US 20120213178A1
• Time in Patent Office: 904 Days
• Field of Search: 370/328, 370/329, 370/338, 455/450, 455/452.2, 455/418, 455/522
• US Class Current: 370/328
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

A wireless communication system has a transmitting device and a receiving device that perform communication by using a multi-carrier signal, wherein the receiving device includes a quality generating unit generating each piece of receiving quality information on each pilot channel for transmitting each pilot signal, a determining unit determining the number of pilot channels needed in the multi-carrier signal based on the receiving quality information, and a notifying unit transmitting a signal requesting the determined number of pilot channels to the transmitting device, and the transmitting device includes an allocation unit determining allocations of pilot signals in the direction of the time axis and in the direction of the frequency axis, corresponding to a requested number of pilot channels, and a transmitting unit transmitting the multi-carrier signal having the determined pilot signal allocations.

Claims

1. A communication system, comprising:

a receiving device including;

a transmitting unit which transmits configuration information indicative of allocations, in a direction of a frequency axis, of pilot signals in a signal to be transmitted from a transmitting device; and

a receiving unit which receives a signal transmitted from the transmitting device in which the pilot signals are allocated based on the configuration information transmitted by the receiving device; and

the transmitting device including;

a receiving unit which receives the configuration information from the receiving device; and

a transmitting unit which transmits the signal to the receiving device in which the pilot signals are allocated based on the configuration information received from the receiving device.

2. A communication system, comprising:

a receiving device including;

a notifying unit which transmits a requesting signal indicative of a number of pilot signals, used for generating receiving quality information, in a direction of a frequency axis in a signal to be transmitted from a transmitting device; and

a receiving unit which receives a signal from the transmitting device in which the pilot signals are allocated based on the requesting signal transmitted by the receiving device; and

the transmitting device including;

an allocation unit which determines allocations, in the direction of the frequency axis, of the pilot signals based on the requesting signal; and

a transmitting unit which transmits the signal having the determined allocations of the pilot signals.