Hardware-efficient demodulator for CDMA adaptive antenna array systems
First Claim
1. A demodulator for a CDMA adaptive antenna array system comprising:
- correlators bank means for receiving digital baseband signals of a chip-level received through an antenna array of a base station and computing correlation values with a local code sequence;
beamforming means for receiving the digital baseband signals and calculating beamforming weight vectors on the basis of the correlation values of said correlators bank means;
beamforming complex multiplying means for a multipath searcher, for receiving the digital baseband signals, performing a complex multiplication for the beamforming weight vector from said beamforming means and the respective signals, and summing up them;
searchers bank means for receiving output signals from said beamforming complex multiplying means provided for the multipath searcher, executing a multipath search to output multipath search timing information, and inputting and outputting data from/to said beamforming means for a selection diversity;
beamforming complex multiplying means for a finger, for receiving the digital baseband signals, performing the complex multiplication for the beamforming weight vector from said beamforming means and the respective signals, and summing up them;
finger bank means for receiving output signals from said beamforming complex multiplying means provided for the finger, executing a multipath tracking on the basis of the multipath search timing information of said searchers bank means, and supplying traced multipath tracking timing information to said correlators bank means; and
multipath-combining means for receiving output signals from said finger bank means, performing a multipath combination for the output signals on a time base, and outputting it.
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Abstract
In the hardware-efficient demodulator for a CDMA adaptive antenna array mechanism of a mobile radio communication system, a correlators bank receives digital baseband signals received through an antenna array of a base station and computes correlation values with a local code sequence. A beamformer receives the digital baseband signals and the correlation values from the correlators bank and calculates beamforming weight vectors. A searchers bank receives the digital baseband signals and calculates an initial acquisition and reliable timing information for a multipath search by a common work with the beamformer, which uses a beamforming algorithm. A beamforming complex multiplier for a finger performs a complex multiplication for the beamforming weight vectors and the digital baseband signals, and sums up them. A finger bank receives output signals from the beamforming complex multiplier, executes a code tracking for an alignment between a transmission code and a phase by each multipath on the basis of the multipath search timing information to then provide the timing information of the multipath tracking to the correlators bank, and outputs signals of dispreaded multipath through a time alignment based on each path. A multipath combiner performs a multipath combination for the output signals of the finger bank on a time base and outputting it.
88 Citations
7 Claims
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1. A demodulator for a CDMA adaptive antenna array system comprising:
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correlators bank means for receiving digital baseband signals of a chip-level received through an antenna array of a base station and computing correlation values with a local code sequence;
beamforming means for receiving the digital baseband signals and calculating beamforming weight vectors on the basis of the correlation values of said correlators bank means;
beamforming complex multiplying means for a multipath searcher, for receiving the digital baseband signals, performing a complex multiplication for the beamforming weight vector from said beamforming means and the respective signals, and summing up them;
searchers bank means for receiving output signals from said beamforming complex multiplying means provided for the multipath searcher, executing a multipath search to output multipath search timing information, and inputting and outputting data from/to said beamforming means for a selection diversity;
beamforming complex multiplying means for a finger, for receiving the digital baseband signals, performing the complex multiplication for the beamforming weight vector from said beamforming means and the respective signals, and summing up them;
finger bank means for receiving output signals from said beamforming complex multiplying means provided for the finger, executing a multipath tracking on the basis of the multipath search timing information of said searchers bank means, and supplying traced multipath tracking timing information to said correlators bank means; and
multipath-combining means for receiving output signals from said finger bank means, performing a multipath combination for the output signals on a time base, and outputting it. - View Dependent Claims (2, 3, 4, 5)
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6. A demodulator for a CDMA adaptive antenna array system comprising:
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correlators bank means for receiving digital baseband signals received through an antenna array of a base station and computing correlation values with a local code sequence;
beamforming means for receiving the digital baseband signals and calculating beamforming weight vectors on the basis of the correlation values of said correlators bank means;
searchers bank means for receiving the digital baseband signals and calculating an initial acquisition and reliable timing information for a multipath search, by a common work with said beamforming means which uses a beamforming algorithm;
finger bank means for receiving the digital baseband signals, executing a code tracking for an alignment between a transmission code and a phase by each multipath on the basis of the multipath search timing information by the common work with said beamforming means, and providing the multipath tracking timing information to said correlators bank means;
complex multiplying means for complex-multiplying the digital baseband input signals of dispreaded symbol-level outputted from said finger bank means, by the beamforming weight vectors provided from said beamforming means, respectively, and then performing its summing-up; and
multipath combining means for performing a multipath combination of the output signals provided from said complex multiplying means, on a time base, and outputting it.
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7. A demodulator for a CDMA adaptive antenna array system comprising:
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correlators bank means for receiving digital baseband signals received through an antenna array of a base station and computing correlation values with a local code sequence;
beamforming means for receiving the digital baseband signals and the correlation values from said correlators bank means, and computing beamforming weight vectors;
searchers bank means for receiving the digital baseband signals and calculating an initial acquisition and reliable timing information for a multipath search, by a common work with said beamforming means which uses a beamforming algorithm;
beamforming complex multiplying means for a finger, for performing a complex multiplication for the beamforming weight vectors and the digital baseband signals, and summing up them;
finger bank means for receiving output signals from said beamforming complex multiplying means, executing a code tracking for an alignment between a transmission code and a phase by each multipath on the basis of the multipath search timing information to then provide the traced multipath tracking timing information to said correlators bank means, and outputting signals of dispreaded multipath through a time alignment based on each path; and
multipath combining means for performing a multipath combination of output signals provided from said finger bank means on a time base, and outputting it.
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Specification