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Layered modulation method, layered demodulation method, transmitter and receiver

A technology of layered modulation and modulation method, which is applied in the direction of modulated carrier system, distribution standard, phase modulated carrier system, etc., and can solve problems such as limiting system performance

Inactive Publication Date: 2015-09-09
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although many efforts have been made to optimize the adaptation of existing modulation methods, conventional proposals to improve a single method have so far limited the performance of the overall system

Method used

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  • Layered modulation method, layered demodulation method, transmitter and receiver
  • Layered modulation method, layered demodulation method, transmitter and receiver
  • Layered modulation method, layered demodulation method, transmitter and receiver

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0042] Embodiments will be described below with reference to the drawings.

[0043] In an embodiment, some data symbols are modulated by a first modulation scheme (such as position-based modulation) in some channel elements, and other data symbols are hierarchically modulated by a second modulation scheme in other channel elements. Symbols are modulated.

[0044]

[0045] The resource element, data block, resource element position modulation word, layered modulation word and index of the modulation symbol mentioned in the implementation are explained below.

[0046] Resource Particles (RE):

[0047] A resource element (RE) is defined as the smallest physical channel unit used to map complex-valued modulation symbols associated with QPSK, 16QAM and 64QAM. REs may consist of channel units in the time domain (pulse), or in the frequency domain (carrier), or in the code domain (Walsh codes), or in the space domain (beams), or combinations thereof. figure 1 is a diagram illust...

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Abstract

A modulation mapper (1003) selects respective data blocks (DBs) hierarchically and sequentially in descending order of a transmission power ratio; locates, from a resource element group, unused REs to which modulation symbols can be allocated; and decides the allocation of modulation symbols in the REs. A channel resource element mapper (1004) performs the mapping of modulation symbols of the respective DBs to the REs on the basis for the decided allocation. A complex-value transmission signal is generated from the group of REs.

Description

technical field [0001] The present invention relates to modulation systems. The present invention can be used, for example, for Multimedia Broadcast Multicast Service (MBMS) in cooperation with Unicast service. Background technique [0002] In communication, modulation is one of the most important processes, which makes changes to periodic waveforms in which it is usually possible to transmit by changing some parameters of a sine wave such as amplitude, phase and frequency information. All these parameters can be modified according to the low frequency information signal to obtain a modulated signal. There are various ways to modulate a signal: Amplitude Modulation (AM), Frequency Modulation (FM), Phase Modulation (PM), and Pulse Modulation (PM). Among these modulation methods, PM is the most commonly used modulation scheme, which can be further classified into Pulse Amplitude Modulation (PAM), Pulse Code Modulation (PCM), Pulse Frequency Modulation (PFM), Pulse Position ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L5/00H04L25/49H04J11/00
CPCH04L5/0058H04L5/0044H04L1/0003H04L27/18H04L27/3483H04L27/32
Inventor 吴建明大渕一央谷口智彦
Owner FUJITSU LTD