Patent ID: 6178194
Filing Date: 2001-01-23
Classification: H04L,H04W

Abstract:
A cellular mobile telephone system comprising at least one cell device and at least one mobile device which mutually transmit and receive an information signal, said cell device being provided with a channel estimation circuit which estimates carriers of receiving signals received from said at least one mobile device, each channel estimation circuit comprising:a first estimation circuit which performs a first stage carrier estimation using pilot symbols having a known pattern, said pilot symbols being disposed in a corresponding receiving signal, said first estimation circuit thereby producing first stage estimated carrier signals;a pre-detection circuit which receives said first stage estimated carrier signals and produces a data symbol train corresponding to said corresponding receiving signal in response thereto; anda second estimation circuit which receives said data symbol train and said pilot symbols and performs a second carrier estimation with respect to said corresponding receiving signal, said second estimation circuit producing second stage estimated carrier signals as a result.