Nec Corporation

Kunifusa Maruyama

Masayuki Kimata

Masato Shiokawa

A coherent bandwidth calculation unit () calculates a coherent bandwidth based on a channel response in the time domain obtained from reception signals (R-R) for each path between transmitting antennas and receiving antennas. A weight calculation control unit () determines target subcarriers of equalization weight calculation based on the coherent bandwidth. A weight calculation unit () calculates the equalization weight of each target subcarrier. A weight interpolation unit () performs interpolation processing using the equalization weights so as to obtain equalization weights for the subcarriers that have not undergone equalization weight calculation yet.

MIMO receiving apparatus and method

A base station creates a dummy pattern added with an error correction code, during occurring of a control channel not allocated for transmission of control information, transmits the dummy pattern instead of control information at a power level lower than a normal power level. A mobile station decodes control information transmitted through the control channel, examines whether or not a value specified by the decoded control information is within a suitable range, and performs error detection of the decoded control information. The mobile station stops decoding of data transmitted through a data channel, upon judging that the value is not within the suitable range or detecting an error in the error detection.

Radio communication system

Parallel interference cancellers are connected in successive stages. In each canceller, multiple signal paths are provided for interference replica estimators to receive multiple CDMA channels. A spread code is generated for each signal path for dispreading the path components of the channel. In each signal path, the despread components are RAKE combined and a symbol replica is detected therefrom either by detecting or estimating the type of modulation. The detected symbol replicas are re-modulated and then re-spread to produce interference replicas. In each stage, the interference replicas are summed and subtracted from a delayed CDMA signal and then summed with the interference replicas of the same stage. Output signals from the final stage are despread and symbol replicas are recovered therefrom. For each signal path, a spread code is detected from a control channel and compared to the generated spread code. Those symbol replicas where a coincidence is detected are supplied to respective decoders and diversity combined.

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Tokyo, Japan

Kunifusa Maruyama