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...

AI Technical Summary

Problems solved by technology

For example, there is the following law: in the case of increasing the number of pilot symbols, although the channel estimation accuracy is improved, the transmission rate will be reduced; in the case of reducing the number of pilot symbols, although the channel estimation accuracy is reduced, But the received error rate will be reduced

In addition, the influence of fading depends on the propagation environment, etc., so even when using radio frames with the same pilot symbol allocation, the channel estimation accuracy based on the pilot symbol allocation varies corresponding to the propagation environment, etc.

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