Wireless communication system, transmitting device and receiving device

Abstract

A wireless communication system, a transmitting device and a receiving unit that attain an excellent error rate characteristic without depending on a propagation environment are provided. A wireless communication system has a transmitting device and a receiving device that perform communication by using a multi-carrier signal in which plural pilot signals are allocated in a direction of a time axis and in a direction of a frequency axis, wherein the receiving device comprises a quality generating means generating each piece of receiving quality information on each pilot channel for transmitting each pilot signal, a determining means determining the number of pilot channels needed in the multi-carrier signal based on the receiving quality information, and a notifying means transmitting a signal requesting the determined number of pilot channels to the transmitting device, and the transmitting device comprises an allocation means determining allocations of pilot signals in the directionof the time axis and in the direction of the frequency axis, corresponding to a requested number of pilot channels, and a transmitting means transmitting the multi-carrier signal having the determined pilot signal allocations.

Description

technical field

[0001] The present invention relates to a wireless communication system, a transmission device, and a reception device that perform channel estimation by using a pilot signal or the like in a multi-carrier transmission method. Background technique

[0002] The OFDM (Orthogonal Frequency Division Multiplexing) method is adopted as a transmission method in various communication systems, and the OFDM method realizes high-speed data communication with high frequency usable efficiency. The OFDM method is defined as a method of dividing transmission data into a plurality of data, mapping the divided transmission data onto a plurality of orthogonal carriers (subcarriers), and transmitting the data in parallel along the frequency axis.

[0003] In 3GPP (Third Generation Partnership Project), examination of the radio frame format used in this type of wireless communication is under consideration, Figure 12 An example of this radio frame format is shown. exist Figur...

Examples

Embodiment Construction

[0036] The wireless communication device in the embodiment of the present invention will be described below with reference to the accompanying drawings. The wireless communication device in this embodiment includes, for example, a mobile terminal and a base station device (access point) that perform wireless communication with each other. It should be noted that the following discussion will treat the wireless communication devices in this embodiment in the following way, that is, for the convenience of explanation, the wireless communication devices are classified into receiving devices and sending devices. However, the present invention is not limited to this structure, but can be applied to a communication device including a reception function and a transmission function to be explained below. Throughout the discussion, the structure in the following embodiment is an example, and thus the present invention is not limited to the structure in this embodiment.

[0037] [recei...

technical field

[0001] The present invention relates to a wireless communication system, a transmission device, and a reception device that perform channel estimation by using a pilot signal or the like in a multi-carrier transmission method. Background technique

[0002] The OFDM (Orthogonal Frequency Division Multiplexing) method is adopted as a transmission method in various communication systems, and the OFDM method realizes high-speed data communication with high frequency usable efficiency. The OFDM method is defined as a method of dividing transmission data into a plurality of data, mapping the divided transmission data onto a plurality of orthogonal carriers (subcarriers), and transmitting the data in parallel along the frequency axis.

[0003] In 3GPP (Third Generation Partnership Project), examination of the radio frame format used in this type of wireless communication is under consideration, Figure 12 An example of this radio frame format is shown. exist Figur...

Examples

Embodiment Construction

[0036] The wireless communication device in the embodiment of the present invention will be described below with reference to the accompanying drawings. The wireless communication device in this embodiment includes, for example, a mobile terminal and a base station device (access point) that perform wireless communication with each other. It should be noted that the following discussion will treat the wireless communication devices in this embodiment in the following way, that is, for the convenience of explanation, the wireless communication devices are classified into receiving devices and sending devices. However, the present invention is not limited to this structure, but can be applied to a communication device including a reception function and a transmission function to be explained below. Throughout the discussion, the structure in the following embodiment is an example, and thus the present invention is not limited to the structure in this embodiment.

[0037] [recei...

Images