System and method for measuring signal to noise values in an adaptive wireless communication system
First Claim
1. A wireless communication system, comprising:
- a base station configured to transmit a signal as a downlink burst, the downlink burst including a portion modulated with a modulation technique; and
a processor coupled to the base station and configured to receive, in an uplink transmission from a recipient node in response to a receipt of the downlink burst from the base station, a signal-to-noise ratio (SNR) measurement measured by the recipient node during the portion of the downlink burst, the portion addressed to one of a plurality of wireless nodes other than the recipient node, the processor further configured to determine, based on the received SNR measurement, whether a current preferred modulation technique of the recipient node should be changed for future downlink communication addressed to the recipient node.
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Accused Products
Abstract
The system and method optimizes a SNR calculation for a signal received during a downlink burst even in the absence of a node'"'"'s preferred modulation. This system and method are used in communication systems that include a multi-modulation modem. An adaptation factor is selected whereby its use during portions of the downlink burst, which were not modulated using the preferred modulation, provides the SNR. The selected adaptation factor is used by an equalizer to perform channel inversion to the signal. The system and method can be used in, for example, an FDD or TDD communication system. Such communication systems can be, for example, symmetric, asymmetric, and/or adaptive in their operation.
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Citations
28 Claims
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1. A wireless communication system, comprising:
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a base station configured to transmit a signal as a downlink burst, the downlink burst including a portion modulated with a modulation technique; and a processor coupled to the base station and configured to receive, in an uplink transmission from a recipient node in response to a receipt of the downlink burst from the base station, a signal-to-noise ratio (SNR) measurement measured by the recipient node during the portion of the downlink burst, the portion addressed to one of a plurality of wireless nodes other than the recipient node, the processor further configured to determine, based on the received SNR measurement, whether a current preferred modulation technique of the recipient node should be changed for future downlink communication addressed to the recipient node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus, comprising:
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a modem configured to receive a downlink burst from a base station, the downlink burst including a portion modulated with a modulation technique, the portion addressed to one of a plurality of wireless nodes other than the apparatus; and a processor module coupled to the modem and configured to measure a signal-to-noise ratio (SNR) measurement corresponding to the portion and determine, based on the SNR measurement, whether to change a current preferred modulation technique for receiving future downlink transmissions from the base station. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method, comprising:
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receiving, by a wireless node from a base station, a downlink burst including a portion modulated with a modulation technique, the portion addressed to one of a plurality of wireless nodes other than the wireless node; measuring, by the wireless node, a signal-to-noise ratio (SNR) measurement of the portion; and using the SNR measurement, by the wireless node, to determine whether to change a current preferred modulation technique for receiving future transmissions from the base station. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification