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High speed digital bit generator

A generator, digital technology, used in digital transmission systems, analog conversion, electrical components, etc., to solve problems such as nonlinear damage and inflexibility

Active Publication Date: 2021-01-15
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional analog-based fronthaul solutions suffer from nonlinear impairments and inflexibility

Method used

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Examples

Experimental program
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Embodiment Construction

[0056]Figure 1A A schematic diagram illustrating some principles adopted by different embodiments is shown. For example, a radio frequency (RF) all-digital transmitter (ADT) system 100 receives a baseband sample 105 having an in-phase (I) component and a quadrature (Q) component from the baseband interface 101, and then uses a digital upper-level converter 110 to sample 105 digital Upconversion to the RF band. For example, the up-conversion 110 can be performed by multiplying baseband samples and RF frequency signals. The pulse encoder 120 then uses, for example, pulse width modulation, delta-sigma modulation, and / or hybrid modulation to encode the up-converted signal 115 to generate an encoded signal 125, also called a pulse train signal 125. In some implementations, depending on the type of pulse encoder 120, the burst signal 125 is a 2-level signal waveform (1-bit) or a multi-level waveform. The encoded signal 125 is amplified by the power amplifier 130, which preferably operates...

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Abstract

A radio frequency (RF) transmitter includes a set of input ports to receive baseband samples of a signal to be transmitted on a set of disjoint frequency bands, a set of filter banks, there is one filter bank for each input port, each filter bank includes a plurality of digital polyphase interpolation filters to sample a shifted phase of the corresponding sequence of baseband samples and to interpolate the sampled phases to produce a plurality of sequences of interpolated baseband phased samples with the shifted phase, and a set of oscillators banks, each oscillator bank includes a plurality of polyphase Digital Direct Synthesizer (DDS) corresponding to the plurality of digital polyphase interpolation filters to generate a plurality of sequences of samples of digital waveform.

Description

Technical field[0001]The present invention generally relates to a high-speed digital bit generator, and more specifically, to a high-speed digital bit generator system for an optical front-end interface.Background technique[0002]Wireless communication is an important part of modern information infrastructure. In the past decade, small handheld devices such as smartphones, tablets, and new types of network-dependent devices have grown exponentially. The demanding requirements for high data rate communication links have promoted successive generations of standards with higher throughput, support for mobility, and higher quality of service (QoS) and quality of experience (QoE). Nonetheless, all further progress must be carried out in a smooth and efficient manner without the need to increase operating expenditure (OPEX) / capital expenditure (CAPEX) costs.[0003]Increasingly, this means that radio resources must be used efficiently, and at the same time, wireless access technologies with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04
CPCH04B1/0028H04B1/0053H03M3/466H04B1/0017H04L1/0071H03M3/30H04B1/0014H04L1/0057
Inventor 马瑞D·A·达科斯塔·迪尼斯永井幸政
Owner MITSUBISHI ELECTRIC CORP