Methods and apparatus for initial acquisition gain control in a communication system

A wireless communication system, frequency capture technology, applied in the direction of gain control, amplification control, pilot signal control, etc., can solve the problems of initial capture failure, distortion, and performance degradation of the receiver part of the transceiver

Active Publication Date: 2010-02-03
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, the gain setting of the gain control may be set in a range too high to properly resolve the next OFDM acquisition pilot symbol transmitted at full power, r...

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  • Methods and apparatus for initial acquisition gain control in a communication system
  • Methods and apparatus for initial acquisition gain control in a communication system
  • Methods and apparatus for initial acquisition gain control in a communication system

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Embodiment Construction

[0013] The present disclosure includes methods and apparatus for ensuring that the gain setting in the receiver portion of a transceiver is set low enough to prevent overshoot or distortion during initial timing and frequency acquisition. The method and apparatus set receiver gain by measuring the power values ​​of received symbols in a signal that occur within the same time period as the initial acquisition pilot symbol period. This gain is adjusted unidirectionally (i.e., reduced) to process the highest power symbols received, thus ensuring full or maximum power for the initially acquired pilot symbols without overshooting or distortion by the amplifier. The gain can be appropriately set sufficiently low.

[0014] figure 1 An exemplary illustration of power levels of a plurality of OFDM symbols received over a period of time in a communication system is shown. from figure 1 As can be seen in , the power level of a particular symbol in an OFDM signal typically varies from ...

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Abstract

Methods and apparatus for initial acquisition gain control in a communication system a method for use in a wireless communication system are 'disclosed. A disclosed methodology includes measuring the power of a signal received by a transceiver a number of times over a prescribed time period, the signal including a number of symbols. A gain of the transceiver can only be decreased when a currentlymeasured power is greater than a previously measured power during the prescribed time period until a maximal power level is measured. By iteratively decreasing the gain to accommodate a maximal powervalue, which is the same as the power level of an acquisition pilot symbol, overshoot and distortion by the transceiver are avoided during initial timing and frequency acquisition. Corresponding apparatus are also disclosed.

Description

technical field [0001] The present disclosure relates generally to methods and apparatus for initial acquisition gain control in a communication system, and more particularly to methods and apparatus for adjusting the gain of a transceiver to prevent incorrect acquisition when receiving initial acquisition symbols in a wireless communication system. A method and apparatus for overshooting (overshoot) caused by a given gain setting. Background technique [0002] In certain communication systems, such as Orthogonal Frequency Division Multiplexing (OFDM) communication systems, it is known to transmit one or more specific OFDM symbols for assisting the receiver portion of the transceiver with initial timing and frequency acquisition. One or more specific OFDM symbols as acquisition pilot symbols are repeatedly transmitted at fixed time intervals using the full or maximum power value. For example, when the transceiver powers up or wakes up from sleep mode, the receiver portion o...

Claims

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Application Information

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IPC IPC(8): H04L27/26H03G3/20
CPCH03G3/005H04L27/2647H03G3/3078H04W52/325
Inventor M·M·王
Owner QUALCOMM INC
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