Receiving method and receiving apparatus with adaptive array signal processing

• US 20050141641A1
• Filed: 12/21/2004
• Published: 06/30/2005
• Est. Priority Date: 12/26/2003
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Tanaka, Yasuhiro, Nakao, Seigo, Doi, Yoshiharu
• Application Number:
  US11/016,807
• Publication Number:
  US 20050141641A1
• Time in Patent Office: Days
• US Class Current: 375/316
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 7/0848 Joint weighting
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

A correlation unit calculates a correlation value from a digital received signal and a predetermined signal. A receiving weight calculation unit applies the LMS algorithm so as to calculate a receiving weight vector signal. The application of the algorithm is based on a spread signal when the digital received signal is adapted for the spectrum spreading scheme, and based on a time-domain signal when the digital received signal is adapted for the OFDM modulation scheme. A multiplication unit weights the digital received signal by the receiving weight vector signal, and an addition unit adds outputs from individual units of the multiplication unit. An FFT unit calculates a fast Fourier transform of a synthesized signal and outputs a frequency-domain signal. A despreading unit despreads the synthesized signal and outputs a despread signal.

Claims

1. A receiver apparatus comprising:

an input unit receiving a plurality of signals;

a calculating unit calculating a plurality of weight coefficients from the input plurality of signals;

a synthesizing unit weighting the input plurality of signals with the plurality of weight coefficients calculated, and synthesizing the weighted signals;

a determining unit determining whether the input plurality of signals are multicarrier signals or non-multicarrier signals;

a first demodulating unit performing demodulation by converting the synthesized signal from a time domain into a frequency domain, when the input plurality of signals are multicarrier signals;

a second demodulating unit demodulating the synthesized signal, when the input plurality of signals are non-multicarrier signals, wherein

said calculating unit calculates the plurality of weight coefficients, based on a time-domain multicarrier signal, when the input plurality of signals are multicarrier signals.

2. The receiver apparatus according to claim 1, wherein

signals determined by said determining unit as being non-multicarrier signals are spectrum spread signals,

said calculating unit stores a time-domain multicarrier signal as a training signal to be used in adaptive algorithm for calculating the plurality of weight coefficients when the input plurality of signals are multicarrier signals, and also stores a spectrum spread signal to be used when the input plurality of signals are non-multicarrier signals, and

said second demodulating unit demodulates the synthesized signal by despreading.

3. The receiver apparatus according to claim 1, further comprising:

a control unit designating, for demodulation, a switch from the second demodulating unit to the first demodulating unit for a demodulation process, when the input plurality of signals change from non-multicarrier signals to multicarrier signals.

4. The receiver apparatus according to claim 2, further comprising:

a control unit designating, for demodulation, a switch from the second demodulating unit to the first demodulating unit for a demodulation process, when the input plurality of signals change from non-multicarrier signals to multicarrier signals.

5. The receiver apparatus according to claim 1, further comprising:

a control unit designating, for demodulation, a switch from the first demodulating unit to the second demodulating unit for a demodulation process, when the input plurality of signals change from multicarrier signals to non-multicarrier signals.

6. The receiver apparatus according to claim 2, further comprising:

a control unit designating, for demodulation, a switch from the first demodulating unit to the second demodulating unit for a demodulation process, when the input plurality of signals change from multicarrier signals to non-multicarrier signals.

7. A receiving method which calculates a plurality of weight coefficients from an input plurality of signals, weights the input plurality of signals with the plurality of weight coefficients calculated, and synthesizes resultant signals, wherein the input plurality of signals are processed based on a time-domain signal, and the plurality of weight coefficients are calculated, regardless of whether the input plurality of signals are multicarrier signals or not.

8. A receiving method comprising:

receiving a plurality of signals;

calculating a plurality of weight coefficients from the input plurality of signals;

weighting the input plurality of signals with the plurality of weight coefficients calculated, and synthesizing the weighted signals;

determining whether the input plurality of signals are multicarrier signals or non-multicarrier signals;

performing demodulation by converting the synthesized signal from a time domain into a frequency domain, when the input plurality of signals are multicarrier signals;

demodulating the synthesized signal, when the input plurality of signals are non-multicarrier signals, wherein

the calculating is based on a time-domain multicarrier signal, when the input plurality of signals are multicarrier signals.

9. The receiving method according to claim 8, wherein

non-multicarrier signals determined as such in the determining are spectrum spread signals,

the calculating stores a time-domain multicarrier signal as a training signal to be used in adaptive algorithm for calculating the plurality of weight coefficients when the input plurality of signals are multicarrier signals, and also stores a spectrum spread signal to be used when the input plurality of signals are non-multicarrier signals, and

the demodulating demodulates the synthesized signal by despreading.

10. The receiving method according to claim 8, further comprising designating, for demodulation, a switch from the demodulating of the synthesized signal to the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain, when the input plurality of signals change from non-multicarrier signals to multicarrier signals.

11. The receiving method according to claim 9, further comprising designating, for demodulation, a switch from the demodulating of the synthesized signal to the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain, when the input plurality of signals change from non-multicarrier signals to multicarrier signals.

12. The receiving method according to claim 8, further comprising designating, for demodulation, a switch from the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain to the demodulating of the synthesized signal, when the input plurality of signals change from multicarrier signals to non-multicarrier signals.

13. The receiving method according to claim 9, further comprising designating, for demodulation, a switch from the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain to the demodulating of the synthesized signal, when the input plurality of signals change from multicarrier signals to non-multicarrier signals.

14. A program executable by a computer, the program including the functions of:

receiving a plurality of signals via a wireless network;

calculating a plurality of weight coefficients from the input plurality of signals and storing the weight coefficients in a memory;

weighting the input plurality of signals with the plurality of weight coefficients stored in the memory, and synthesizing the weighted signals;

determining whether the input plurality of signals are multicarrier signals or non-multicarrier signals;

performing demodulation by converting the synthesized signal from a time domain into a frequency domain, when the input plurality of signals are multicarrier signals;

demodulating the synthesized signal, when the input plurality of signals are non-multicarrier signals, wherein

the calculating is based on a time-domain multicarrier signal, when the input plurality of signals are multicarrier signals.

15. The program according to claim 14, wherein non-multicarrier signals determined as such in the determining are spectrum spread signals,

the calculating and storing stores a time-domain multicarrier signal as a training signal to be used in adaptive algorithm for calculating the plurality of weight coefficients when the input plurality of signals are multicarrier signals, and also stores a spectrum spread signal to be used when the input plurality of signals are non-multicarrier signals, and

the demodulating demodulates the synthesized signal by despreading.

16. The program according to claim 14, further comprising designating, for demodulation, a switch from the demodulating of the synthesized signal to the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain, when the input plurality of signals change from non-multicarrier signals to multicarrier signals.

17. The program according to claim 15, further comprising designating, for demodulation, a switch from the demodulating of the synthesized signal to the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain, when the input plurality of signals change from non-multicarrier signals to multicarrier signals.

18. The program according to claim 14, further comprising designating, for demodulation, a switch from the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain to the demodulating of the synthesized signal, when the input plurality of signals change from multicarrier signals to non-multicarrier signals.

19. The program according to claim 15, further comprising designating, for demodulation, a switch from the performing of demodulation by converting the synthesized signal from a time domain into a frequency domain to the demodulating of the synthesized signal, when the input plurality of signals change from multicarrier signals to non-multicarrier signals.