Base station apparatus and method for wireless communications
First Claim
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1. A base station apparatus comprising:
- an adaptive array antenna receiving means for receiving signals from communication terminals by an adaptive array antenna with a receiving directivity pattern obtained in advance;
a correlation level detecting means for detecting a correlation level for said respective receiving directivity patterns; and
a means for detecting said already-known signal section of a random access channel signal by using the results of the detection of correlation level and for detecting despreading timing of said already-known signal section.
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Abstract
Weights are not calculated by using signals of the preamble section in a random access channel (RACH), but signals of the preamble section of the RACH are received by an adaptive array antenna (AAA) with a plurality of directivity patterns using the existing weights, delay profiles are prepared for respective directivity patterns, and the preamble section and despreading timing are detected by using the delay profiles. Further, the invention is featured in that a control signal in an acquisition indication channel (AICH) is received by the AAA with a directivity pattern that is selected when receiving the signals of preamble section of the RACH by the AAA.
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Citations
10 Claims
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1. A base station apparatus comprising:
- an adaptive array antenna receiving means for receiving signals from communication terminals by an adaptive array antenna with a receiving directivity pattern obtained in advance;
a correlation level detecting means for detecting a correlation level for said respective receiving directivity patterns; and
a means for detecting said already-known signal section of a random access channel signal by using the results of the detection of correlation level and for detecting despreading timing of said already-known signal section. - View Dependent Claims (2, 3, 4, 5)
- an adaptive array antenna receiving means for receiving signals from communication terminals by an adaptive array antenna with a receiving directivity pattern obtained in advance;
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6. A communication terminal unit for carrying out wireless transmission with a base station apparatus, wherein said base station apparatus includes:
- means for receiving signals from a communication terminal by an adaptive array antenna with a receiving directivity pattern obtained in advance, means for detecting a correlation level for said respective receiving directivity patterns; and
means for detecting, by using the result of said correlation level detection, said already-known signal section of a random access channel signal and despreading timing of said already-known signal section.
- means for receiving signals from a communication terminal by an adaptive array antenna with a receiving directivity pattern obtained in advance, means for detecting a correlation level for said respective receiving directivity patterns; and
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7. A communication terminal unit, comprising:
means for carrying out a despreading process with respect to a reference signal that is transmitted by an adaptive array antenna with the same directivity as that of the AICH signals transmitted from a base station apparatus by the AAA with a random access channel signal;
means for estimating a channel of said AICH signal using an output of said despreading means; and
means for demodulating said AICH signal using an output said channel estimating means.- View Dependent Claims (8)
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9. A method for wireless communications, comprising the steps of:
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receiving signals from communication terminals by an adaptive array antenna with the receiving directivity patterns obtained in advance;
detecting a correlation level for said respective receiving directivity patterns; and
detecting the already-known signal section of random access channel signals by using the result of said correlation level detection, and detecting despreading timing of said already-known signal section. - View Dependent Claims (10)
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Specification