Carrier detection for a wireless local area network
DCFirst Claim
1. A local area network station for receiving data symbols encoded in a spread spectrum code and transmitted over a wireless channel, comprising:
- an analog-to-digital conversion means to provide a digital representation of a received signal;
correlator means coupled to said analog-to-digital conversion means to provide a plurality of signal samples;
integrator and storage means including a plurality of storage registers to store values of integrated representations of said plurality of signal samples;
peak determining means to determine the maximum value stored in said plurality of storage registers;
total value determining means to determine the total value of the values stored in said plurality of storage registers;
spike quality determining means to provide a quality value signal representative of the quality of said received signal, with said quality being dependent upon said maximum value and said total value; and
carrier detection means responsive to said quality value signal to provide a carrier detect signal.
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Accused Products
Abstract
A local area network (10) utilizes a wireless transmission link and has network stations (12) each having two differently polarized antennas (14, 16). Data transmission utilizes a spread spectrum code and in the receiver, correlator outputs are utilized in an integrator and registers circuit (54) to provide correlator output sample values integrated over a plurality of symbol intervals. These values are stored in registers (156) the contents of which are utilized to determine a peak value and a total value which are applied to a spike quality determination circuit (78) including a look-up table (200). The resultant spike quality output value represents the quality of the received signal and is utilized for carrier detection and for antenna selection.
127 Citations
14 Claims
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1. A local area network station for receiving data symbols encoded in a spread spectrum code and transmitted over a wireless channel, comprising:
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an analog-to-digital conversion means to provide a digital representation of a received signal; correlator means coupled to said analog-to-digital conversion means to provide a plurality of signal samples; integrator and storage means including a plurality of storage registers to store values of integrated representations of said plurality of signal samples; peak determining means to determine the maximum value stored in said plurality of storage registers; total value determining means to determine the total value of the values stored in said plurality of storage registers; spike quality determining means to provide a quality value signal representative of the quality of said received signal, with said quality being dependent upon said maximum value and said total value; and carrier detection means responsive to said quality value signal to provide a carrier detect signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In apparatus for receiving a signal representing data symbols encoded in a spread spectrum code, and transmitted over a wireless communication channel, a method for processing the received signal, including the steps of:
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(a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; and (e) determining a spike quality value based on said peak value and said total value.
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13. In apparatus for receiving data symbols encoded in a spread spectrum code, and transmitted using a carrier signal on a wireless communication channel, a method for carrier signal detection, including the steps of:
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(a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; (c) averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; (e) determining a spike quality value based on said peak value and said total value; and (f) utilizing said spike quality value to detect the reception of said carrier signal.
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14. A method of operating apparatus for receiving a signal representing data symbols encoded in a spread spectrum code, and transmitted over a wireless communication channel, said apparatus including a plurality of antennas, including the steps of:
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(a) converting the received signal to a digital representation; (b) correlating said digital representation to provide a plurality of signal samples; (c) averaging said signal samples; (d) determining a peak value and a total value for the averaged signal samples; (e) determining a spike quality value based on said peak value and said total value; and (f) utilizing said spike quality value to select one of said plurality of antennas for signal reception.
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Specification