Methods to compensate for noise in a wireless communication system
First Claim
1. A method of compensating for conditions on an uplink channel from a plurality of subscriber stations to a base station, the method comprising:
- transmitting on a downlink channel from the base station to a plurality of subscriber stations MAP messages that assign time slots in which subscriber stations may transmit signal bursts on the uplink channel, the MAP messages including idle slots that are assigned to no subscriber stations;
monitoring conditions on the uplink channel during the idle slots; and
compensating for the monitored conditions on the uplink channel; and
receiving at the base station signal bursts on the uplink channel after such compensation.
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Accused Products
Abstract
A number of features for enhancing the performance of a communication system, in which data is transmitted between a base station and a plurality of subscriber stations located different distances from the base station, are presented. The power transmission level, slot timing, and equalization of the subscriber stations are set by a ranging process. Data is transmitted by the subscriber stations in fragmented form. Various measures are taken to make transmission from the subscriber stations robust. The uplink data transmission is controlled to permit multiple access from the subscriber stations.
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Citations
23 Claims
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1. A method of compensating for conditions on an uplink channel from a plurality of subscriber stations to a base station, the method comprising:
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transmitting on a downlink channel from the base station to a plurality of subscriber stations MAP messages that assign time slots in which subscriber stations may transmit signal bursts on the uplink channel, the MAP messages including idle slots that are assigned to no subscriber stations; monitoring conditions on the uplink channel during the idle slots; and compensating for the monitored conditions on the uplink channel; and receiving at the base station signal bursts on the uplink channel after such compensation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of compensating for conditions on an uplink channel from a plurality of subscriber stations to a base station, the method comprising:
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compensating for noise on an uplink channel; receiving on the compensated uplink channel a ranging signal from a subscriber station of the plurality of subscriber stations; adjusting filter coefficients to compensate for intersymbol interference on the uplink channel responsive to the received ranging signal; and transmitting the adjusted coefficients on a downlink channel to the subscriber station for the purpose of pre-equalization of the uplink channel. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of compensating for noise in a wireless communication system, comprising:
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transmitting a MAP message via a downlink channel from a base station to at least one subscriber station, the MAP message assigning time slots during which the at least one subscriber station is allowed to transmit signal bursts via an uplink channel to the base station, the MAP message including at least one idle slot not assigned to any subscriber station; sensing noise associated with the uplink channel during the at least one idle slot; and adjusting a filter coefficient based on the noise to suppress the noise in signal bursts received via the uplink channel. - View Dependent Claims (21, 22, 23)
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Specification