Cascaded phase pulse position and pulse width modulation based digital transmitter

A pulse width modulation and phase modulator technology, applied in the field of communication, can solve problems affecting reliability, low power efficiency, and not simple

Active Publication Date: 2013-05-01
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Power control to mobile units can also result in average transmit power typically 30dB to 50dB below peak power and a corresponding reduction in efficiency
In mobile and handheld applications, this lower power efficiency in transmit mode can seriously affect reliability due to, for example, thermal issues and limited battery life in handheld devices
Switching PAs are often used with pure frequency / phase modulation schemes to achieve high efficiencies, but switching PAs for OFDM systems is not straightforward

Method used

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  • Cascaded phase pulse position and pulse width modulation based digital transmitter
  • Cascaded phase pulse position and pulse width modulation based digital transmitter
  • Cascaded phase pulse position and pulse width modulation based digital transmitter

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Embodiment Construction

[0020] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the claimed subject matter. However, it will be understood by those skilled in the art that the claimed subject matter may be practiced without these specific details. In other instances, well-known methods, procedures, components and / or circuits have not been described in detail.

[0021] In the following description and / or claims, the terms "coupled" and / or "connected" and their derivatives may be used. In particular embodiments, "connected" may be used to mean that two or more elements are in direct physical and / or electrical contact with each other. "Coupled" may mean that two or more elements are in direct physical and / or electrical contact. However, "coupled" may also mean that two or more elements may not be in direct contact with each other, but still cooperate and / or interact with each other. For example, "coupled" may mean that two ...

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Abstract

Briefly, in accordance with one or more embodiments, a digital transmitter may comprise two or more phase modulators in a cascaded arrangement. The phase modulators may modulate a local oscillator signal using control signals derived from the quadrature baseband data to be transmitted. A closed loop power control feedback arrangement may be used to compare the output power of the transmitter with a desired output signal, and make corrections to the output signal by modifying at least one of the control signals provided to the cascaded phase modulators.

Description

technical field [0001] The present invention relates to the field of communication. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) has become the modulation of choice for higher data rate wireless communication links for Personal Area Network (PAN), Local Area Network (LAN) and Metropolitan Area Network (MAN) networks. OFDM waveforms have magnitude and phase information, requiring linear amplifiers in transmitter power amplifiers (PAs), which are generally less efficient. The effective peak-to-average power ratio, typically 1OdB to 15dB, further reduces the average efficiency of such OFDM transmitters. Power control to the mobile unit can also result in an average transmit power typically 30dB to 50dB below the peak power and a corresponding decrease in efficiency. In mobile and handheld applications, this lower power efficiency in transmit mode can severely impact reliability due to, for example, thermal issues and limited battery life of ...

Claims

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Application Information

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IPC IPC(8): H04B1/40H04B1/00
CPCH04L25/4902
Inventor O·德加尼H·拉克达瓦拉A·拉维
Owner APPLE INC
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