Wideband channelizer incorporating diversity switch
First Claim
1. A base station for processing signals in a multiple mobile subscriber unit wireless communication system comprising:
- a first antenna for receiving signals from a plurality of the mobile subscriber units as first composite radio frequency, RF, signal;
first wideband digital tuner means, connected to the first antenna, for downconverting a selected bandwidth of the first composite RF signal to a first intermediate frequency, IF, signal and for performing an analog to digital conversion on the first IF signal, to provide a first wideband tuner output signal;
first digital channelization means, being connected to receive the first wideband tuner output signal, and providing a first set of digital channel signal outputs in a predetermined sequential order, each digital channel signal output in the first set of digital channel signal outputs having a predetermined channel bandwidth, and each one of the first set of digital channel signal outputs corresponding to one of the signals received from one of the mobile units;
a second antenna for receiving signals from the plurality of mobile units as second composite RF signal;
second wideband digital tuner means, connected to the second antenna, for downconverting the selected bandwidth of the second composite RF signal to a second IF signal and for performing an analog to digital conversion on the second IF signal, to provide a second wideband tuner output signal;
second digital channelization means, being connected to receive the second wideband tuner output signal, and providing a second set of digital channel signal outputs in the same predetermined sequential order as the first set of digital channel signal outputs, each one of the second set of digital channel signal outputs having the same predetermined channel bandwidth as the first set of digital channel signal outputs, and each one of the second set of digital channel signal outputs corresponding to one of the signals received from one of the mobile units; and
sequential diversity processing means, being connected to receive the first set of digital channel signal outputs and the second set of digital channel signal outputs, for comparing a magnitude of respective ones of the first set of digital channel signal outputs to a magnitude of corresponding ones of the second set of digital channel signal outputs, to provide a set of diversity processed digital channel signals.
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Accused Products
Abstract
A diversity technique for use in a multichannel receiver such as a cellular base station which includes at least a pair of wideband digital filter bank analyzers, or so-called channelizers, to provide digital output signals representing the signals received from a number of mobile subscriber units operating in or near the cell in which the base station is located. Samples of the digital output signals are presented to a time division multiplex (TDM) bus in a predetermined sequence, such as in a sequence which increases incrementally by channel number. A diversity decision is then made by processing each of the channelizer outputs for each channel in the sequence, to determine which one of the outputs contains the strongest receive signal. The channelizer path so determined is then connected to the rest of the base station, on a per channel basis, through a delay unit and multiplexer. As a result, the diversity-enhanced outputs remain in the same time division multiplex, pre-defined sequence so that further base station processing, such as demodulation, can occur in the same way as for a wideband base station system which does not take advantage of diversity techniques.
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Citations
8 Claims
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1. A base station for processing signals in a multiple mobile subscriber unit wireless communication system comprising:
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a first antenna for receiving signals from a plurality of the mobile subscriber units as first composite radio frequency, RF, signal; first wideband digital tuner means, connected to the first antenna, for downconverting a selected bandwidth of the first composite RF signal to a first intermediate frequency, IF, signal and for performing an analog to digital conversion on the first IF signal, to provide a first wideband tuner output signal; first digital channelization means, being connected to receive the first wideband tuner output signal, and providing a first set of digital channel signal outputs in a predetermined sequential order, each digital channel signal output in the first set of digital channel signal outputs having a predetermined channel bandwidth, and each one of the first set of digital channel signal outputs corresponding to one of the signals received from one of the mobile units; a second antenna for receiving signals from the plurality of mobile units as second composite RF signal; second wideband digital tuner means, connected to the second antenna, for downconverting the selected bandwidth of the second composite RF signal to a second IF signal and for performing an analog to digital conversion on the second IF signal, to provide a second wideband tuner output signal; second digital channelization means, being connected to receive the second wideband tuner output signal, and providing a second set of digital channel signal outputs in the same predetermined sequential order as the first set of digital channel signal outputs, each one of the second set of digital channel signal outputs having the same predetermined channel bandwidth as the first set of digital channel signal outputs, and each one of the second set of digital channel signal outputs corresponding to one of the signals received from one of the mobile units; and sequential diversity processing means, being connected to receive the first set of digital channel signal outputs and the second set of digital channel signal outputs, for comparing a magnitude of respective ones of the first set of digital channel signal outputs to a magnitude of corresponding ones of the second set of digital channel signal outputs, to provide a set of diversity processed digital channel signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification