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A Method for Generating Baseband Data at Low Sampling Rates

A baseband data, low sampling rate technology, used in FM carrier systems, electrical components, orthogonal multiplexing systems, etc., can solve the problem of increased power consumption, high SC-FDMA symbol redundancy, and increased data processing. It can reduce the complexity, have a wide range of applications and have strong adaptability.

Active Publication Date: 2021-05-04
LEADCORE TECH +1
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Problems solved by technology

The disadvantage of this method is that the redundancy of SC-FDMA symbols generated by the baseband is too high, which increases the amount of calculation for data processing and indirectly leads to increased power consumption.

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  • A Method for Generating Baseband Data at Low Sampling Rates
  • A Method for Generating Baseband Data at Low Sampling Rates
  • A Method for Generating Baseband Data at Low Sampling Rates

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[0028] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0030] When the terminal generates uplink SC-FDMA symbols, in order to make the length of a subframe meet the requirement of 1ms, two different cyclic prefix (CyclicPrefix, CP) lengths are defined for the seven SC-FDMA symbols in a slot (slot). , respectively at 30.72MHz sampling rate The length of the data part (not including the cyclic prefix) is N at a sampling rate of 30.72MHz Data = 2048 chips. Wherein, at a sampling rate of 30.72...

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Abstract

The present invention provides a method and device for generating baseband data at a low sampling rate. First, determine the start time offset value t_shift of the current SC-FDMA symbol; secondly, determine the number of sampling points of the current SC-FDMA symbol Finally, starting from the starting time offset value t_shift, the corresponding time-domain data is repeatedly calculated with the sampling period ts as the step size, until the number of sampling points is N. It directly generates SC‑FDMA baseband symbols at a low sampling rate, which has the advantage of low complexity.

Description

technical field [0001] The invention mainly relates to baseband signal generation, and in particular to a method for generating baseband data at a low sampling rate. Background technique [0002] In order to meet the low power consumption, large connection, strong coverage, and low-cost application requirements of the Internet of Things, NB-IoT technology, which adopts ultra-narrowband, repeated transmission, and simplified network design, emerged as the times require. In terms of physical layer design, NB-IoT technology inherits most of the content of LTE, but due to its narrowband characteristics, it can use a lower sampling rate to generate uplink baseband data. figure 1 It shows the basic composition structure of the SC-FDMA signal generated by the terminal. refer to figure 1 , the terminal 100 generates the SC-FDMA signal mainly as follows: the sampling clock 104 generates the sampling clock signal, and outputs it to the baseband data generation module 101 and the ana...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/10H04B7/208
CPCH04B7/208H04J2211/006H04L27/10
Inventor 董亮叶露张明林
Owner LEADCORE TECH
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