Variable bandwidth fmt frequency division multiple access method based on single carrier transmission

A frequency division multiple access and access method technology, applied in the field of signal transmission, can solve the problems of reducing the implementation complexity of the transmitter, and achieve the effects of reducing complexity, reducing requirements, and improving efficiency

Active Publication Date: 2011-11-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is: how to greatly reduce the implementation complexity of the transmitter

Method used

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  • Variable bandwidth fmt frequency division multiple access method based on single carrier transmission
  • Variable bandwidth fmt frequency division multiple access method based on single carrier transmission
  • Variable bandwidth fmt frequency division multiple access method based on single carrier transmission

Examples

Experimental program
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Embodiment 1

[0049] This embodiment is a sub-carrier (one-tone)-FMT scheme suitable for digital television return channels.

[0050] Assume that an uplink system has M sub-carrier bandwidth requirements. Then define {f 1 ,..., f M} Kinds of carrier bandwidth, where

[0051] f m =k m f 1 (1)

[0052] k m is a positive integer, and m refers to the carrier numbers from low-frequency sub-carriers to high-frequency sub-carriers.

[0053] A user uses the service with the lowest rate, and the minimum bandwidth of its transmitter is f 1 The subcarriers of , the shaping filter adopts the root raised cosine filter or other filters with better truncation effect in the frequency domain, the roll-off coefficient is α, and the passband bandwidth is The shaping filter used when recording the minimum bandwidth is g(n), where g(n) is called the original filter. Bandwidth is f 1 The subcarriers sent by the user are

[0054] s ( u ...

Embodiment 2

[0068] If the transmitted single-carrier signal cannot be regarded as flat fading, a CP header can be added to the OFDM block for protection, such as Figure 4 , the implementation method steps are the same as those in Embodiment 1.

[0069] As can be seen from the above embodiments, the present invention is variable through 1) the bandwidth of the subcarriers sent by each user (subcarriers with different bandwidths have different capabilities against time-selective and frequency-selective fading), and the bandwidth of the subcarriers needs to be Satisfy certain conditions; 2) The variable bandwidth sub-carrier is a filtered single-carrier signal; 3) The transmitter sends data synchronously and demodulates in parallel at the receiver, which reduces the complexity of the transmitter and implementation, and at the same time reduces the system's need for synchronization The peak-to-average ratio of requirements and systems improves the efficiency of resource allocation.

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Abstract

The invention relates to the technical field of signal transmission, and discloses a frequency division multiple access method of a variable-bandwidth FMT (frequency modulated transmitter) based on single-carrier transmission. The frequency division multiple access method comprises the following steps: S1. different users transmit variable-bandwidth subcarrier signals synchronously at the transmitting end, wherein the subcarrier signals are obtained through filtering of original data to be transmitted by the users; and S2. the signals sent from different users are received in parallel at the receiving end. In the frequency division multiple access method disclosed by the invention, (1) the bandwidth of subcarriers transmitted by each user is variable (subcarriers of different bandwidth have different resistance to time selective fading and frequency selective fading), and the bandwidth of the subcarriers needs to meet a certain condition; (2) the variable-bandwidth subcarriers are filtered single-carrier signals; and (3) a transmitter transmits data synchronously, and the data is demodulated in parallel by a receiver, thus the realizing complexity of the transmitter and the receiver is reduced, the requirement of the system on synchronization and the peak-to-average power ratio of the system are reduced, and the resource allocation efficiency is improved simultaneously.

Description

technical field [0001] The invention relates to the technical field of signal transmission, in particular to a variable bandwidth FMT frequency division multiple access method based on single carrier transmission. Background technique [0002] In the current wireless communication system, there are two contradictions, one is the contradiction between the increasing number of users and limited spectrum resources, and the other is the contradiction between the user's demand for service quality and the wireless propagation environment. These two contradictions are particularly obvious in uplink communication. In the uplink transmission of mobile communication and the uplink transmission of digital TV, the data sent by each user has the characteristics of small amount of information and large number of users. For example, a typical digital TV on-demand service can meet the requirements with a transmission rate of 9.6k bit / s. However, during peak hours, the number of users send...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 王军杨知行路冠平王昭诚张超
Owner TSINGHUA UNIV
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