Patent ID: 7881252
Filing Date: 2011-02-01
Classification: H04W,Y02D

Abstract:
1. A terminal for use in a wireless network, the terminal comprising: a radio frequency (RF) receiver, which is configured to receive and downconvert a RF signal over a wireless channel so as to generate an output signal, the RF signal comprising a sequence of downlink frames, each downlink frame comprising at least a map zone followed by a data zone, the map zone containing an indication of a time allocation in the data zone during which downlink data will be transmitted to the terminal; an analog/digital (A/D) converter, which is coupled to convert the output signal into a stream of digital samples; and a digital processing circuit, which is coupled to process the digital samples in the map zone of each downlink frame so as to identify the time allocation and so as to estimate one or more characteristics of the wireless channel in order to calculate a margin as a function of the characteristics estimated over the map zone, and then to process the digital samples in the data zone of the downlink frame so as to recover the downlink data transmitted during the identified time allocation, and to shut down the RF receiver at a shut-down time that follows an end time of the time allocation in the downlink frame by the margin.