Interference reduction receiving device and method thereof

An interference reduction receiving device demodulating signals by despreading digital signals, at a plurality of timings, into which the signals received by a plurality of antennas are converted, by multiplying each of the signals after being despread by a weight corresponding to each of the plurality of timings at which to perform despreading and corresponding to each of the plurality of antennas, and by combining the signals, the interference reduction receiving device comprising:

• an estimation unit calculating, based on the digital signals, channel response vectors having, as elements, channel estimation values corresponding to each of the plurality of timings;
• a quantizing unit quantizing each of the digital signals in the vicinity of each of the plurality of timings;
• a delaying unit delaying each of the quantized signals by a time difference between the timing corresponding to each of the quantized signals and another timing in the plurality of timings;
• a power calculating unit calculating received signal power of each of the digital signals;
• a signal correlation matrix generation unit compensating each of the signal correlation values calculated based on each of the quantized signals and on each of the delay signals that has been delayed by the delaying unit according to the received signal power of each of the digital signals used as source of each of the signal correlation values, and generating a signal correlation matrix having, as the element, each of the signal correlation values after being compensated;
• and
• an weight calculating unit calculating each of the weights corresponding to each of the plurality of timings and each of the plurality of antennas based on the channel response vectors and the signal correlation matrix.

An interference reduction receiving method in a receiving device demodulating a signal by despreading a digital signal at a plurality of timings, by multiplying each of signals after being despread by a weight corresponding to each of the plurality of timings at which to perform despreading, and by combining the signals, the interference reduction receiving method comprising:

• estimating, based on the digital signal, a channel response vector having, as elements, channel estimation values corresponding to each of the plurality of timings;
• quantizing the digital signal in the vicinity of each of the plurality of timings;
• delaying each of the quantized signals by a time difference between the timing corresponding to each of the quantized signal and another timing in the plurality of timings;
• generating by the receiving device a signal correlation matrix having, as the element, each of signal correlation values calculated based on each of the quantized signal and on each of the delay signals that has been delayed;
• and
• calculating by the receiving device each of the weights corresponding to each of the plurality of timings based on the channel response vector and the signal correlation matrix.

An interference reduction receiving method in a receiving device demodulating signals by despreading digital signals, at a plurality of timings, into which the signals received by a plurality of antennas are converted, by multiplying each of the signals after being despread by a weight corresponding to each of the plurality of timings at which to perform despreading and corresponding to each of the plurality of antennas, and by combining the signals, the interference reduction receiving method comprising:

• calculating, based on the digital signals, channel response vectors having, as elements, channel estimation values corresponding to each of the plurality of timings;
• quantizing each of the digital signals in the vicinity of each of the plurality of timings;
• delaying each of the quantized signals by a time difference between the timing corresponding to each of the quantized signals and another timing in the plurality of timings;
• calculating by the receiving device received signal power of each of the digital signals;
• compensating by the receiving device each of the signal correlation values calculated based on each of the quantized signals and on each of the delay signals that has been delayed according to the received signal power of each of the digital signals used as source of each of the signal correlation values, and generating by the receiving device a signal correlation matrix having, as the element, each of the signal correlation values after being compensated;
• and
• calculating by the receiving device each of the weights corresponding to each of the plurality of timings and each of the plurality of antennas based on the channel response vectors and the signal correlation matrix.