Patent ID: 9088338
Filing Date: 2015-07-21
Classification: H04B,H04L

Abstract:
1. A wireless communication system for transmitting and receiving frames comprising basic pilot symbols used commonly for one or more reception devices which communicate with a transmission device, in propagation path estimation, control symbols conveying control information used for data channel demodulation, and data symbols conveying information bits, wherein the transmission device comprises: a pilot addition decision portion for deciding whether to add pilot symbols and a position of additional pilot symbols, which are separate from the basic pilot symbols, to frames; a control symbol generation portion for generating control symbols comprising information indicating whether the additional pilot symbols are present and the position of the additional pilot symbols; a frame assembly portion for assembling frames to which said pilot symbols are added according to said pilot addition decision; and a transmission portion for transmitting the frames; and the reception device comprises: a control symbol demodulation portion for demodulating control symbols included in the received frames, and judges whether the additional pilot symbols symbols are included in the received frames based on the control symbol information; and a data symbol demodulation portion for demodulating data symbols based on a propagation path estimation value which is estimated using the additional pilot symbols or using the additional pilot symbols and the basic pilot symbols when the additional pilot symbols are included in the received frame.