Wireless receiver
View Patent ↗A wireless receiver including receiving antennas, frequency-space transformers, noise wave removers, a back-end signal processor, a pattern detector, a broadcast interruption detector, and a back-end controller. The frequency-space transformers convert signals received by the antennas into frequency-space signals. The noise wave removers each at least perform the calculation of a transmission line coefficient matrix and the calculation of an inter-antenna covariance matrix on the frequency-space signals. A controller controls the back-end signal processor to operate when the multicarrier transmission waves have been detected to be interrupted. The noise wave removers each perform the calculation of the inter-antenna covariance matrix when a broadcast interruption detector has detected the interruption of the multicarrier airwaves. Thus, the wireless receiver removes noise generated within it, thereby having high reception sensitivity.
1. A wireless receiver comprising:
a plurality of receiving antennas for receiving multicarrier transmission waves;
a plurality of frequency-space transformers connected to corresponding ones of the receiving antennas, the frequency-space transformers converting signals received by the receiving antennas into frequency-space signals;
a plurality of noise wave removers connected to corresponding ones of the frequency-space transformers, the noise wave removers each at least performing:
calculation of a transmission line coefficient matrix of the multicarrier transmission waves; and
calculation of an inter-antenna covariance matrix between the receiving antennas on the frequency-space signals obtained by conversion in the frequency-space transformers;
a back-end signal processor for performing a back-end process on signals related to outputs of the noise wave removers;
a pattern detector for detecting specific data from the multicarrier transmission waves received by the receiving antennas;
a broadcast interruption detector for detecting a state of interruption of the multicarrier transmission waves; and
a back-end controller for controlling the back-end signal processor to operate when the broadcast interruption detector has detected the interruption of the multicarrier transmission waves, wherein
the noise wave removers each perform the calculation of the inter-antenna covariance matrix when the broadcast interruption detector has detected the interruption of the multicarrier transmission airwaves.
2. The wireless receiver of claim 1 , wherein
the noise wave removers each include:
a weighting/combining unit for weighting and combining outputs of the receiving antennas;
a transmission line estimator for receiving the frequency-space signals, and calculating the transmission line coefficient matrix of the multicarrier transmission waves based on the specific data detected; and
an undesired signal measurer for calculating the inter-antenna covariance matrix.
3. The wireless receiver of claim 2 , wherein
the pattern detector detects one of an MPEG synchronous code and an MPEG start code.
4. The wireless receiver of claim 2 , wherein
the back-end signal processor performs processes including a decoding process of MPEG data.
5. The wireless receiver of claim 1 further comprising:
a back-end stop unit for stopping a process of the back-end signal processor; and
a compensation buffer for storing received data, and intermittently supplying the received data to the back-end signal processor, wherein
while the back-end stop unit stops the process of the back-end signal processor, the transmission line estimator calculates the transmission line coefficient matrix, and
the compensation buffer holds the received data while the back-end stop unit stops the process of the back-end signal processor.
6. The wireless receiver of claim 5 , wherein
the compensation buffer includes:
a PCR (Program Clock Reference) extractor for detecting clock information contained in the received data;
a PCR (Program Clock Reference) offset adder for adding an offset to the clock information detected by the PCR extractor;
a storing unit for storing the received data; and
a PCR (Program Clock Reference) replacing unit for correcting the clock information contained in the received data stored in the storing unit by the clock information detected by the PCR extractor.
7. The wireless receiver of claim 6 , wherein
the pattern detector detects one of an MPEG synchronous code and an MPEG start code.
8. The wireless receiver of claim 6 , wherein
the back-end signal processor performs processes including a decoding process of MPEG data.
9. The wireless receiver of claim 5 , wherein
the compensation buffer includes:
a storing unit for storing the received data;
a PCR (Program Clock Reference) extractor for detecting clock information contained in the received data; and
a switcher for switching clock information contained in the received data stored in the storing unit to the clock information detected by the PCR extractor.
10. The wireless receiver of claim 9 , wherein
the pattern detector detects one of an MPEG synchronous code and an MPEG start code.
11. The wireless receiver of claim 9 , wherein
the back-end signal processor performs processes including a decoding process of MPEG data.
12. The wireless receiver of claim 5 , wherein
the pattern detector detects one of an MPEG synchronous code and an MPEG start code.
13. The wireless receiver of claim 5 , wherein
the back-end signal processor performs processes including a decoding process of MPEG data.
14. The wireless receiver of claim 1 , wherein
the pattern detector detects one of an MPEG synchronous code and an MPEG start code.
15. The wireless receiver of claim 1 , wherein
the back-end signal processor performs processes including a decoding process of MPEG data.