Interlayer modulation method, device, orthogonal frequency division multiple access method and transmitter

A modulation method and a technology of symbol modulation, applied in the field of communication, can solve the problem that the spectrum is not fully utilized, and achieve the effect of improving spectrum utilization, increasing space distance, and reducing interference

Active Publication Date: 2009-06-03
HUAWEI TECH CO LTD
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Problems solved by technology

[0004] During the research and practice of the prior art, the inventors of the present invention found that the frequency spectrum of the OFDM-based system has not been fully utilized at present, and there is a possibility to further improve the frequency spectrum utilization

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  • Interlayer modulation method, device, orthogonal frequency division multiple access method and transmitter
  • Interlayer modulation method, device, orthogonal frequency division multiple access method and transmitter
  • Interlayer modulation method, device, orthogonal frequency division multiple access method and transmitter

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Embodiment Construction

[0021] An embodiment of the present invention provides an interlayer modulation method using layered interleaving coding. In at least one layer of the interlayer modulation, amplitude adjustment and / or phase offset are performed on signals after symbol modulation. The embodiment of the present invention also provides a corresponding interlayer modulation device, an OFDMA access method and an OFDMA transmitter. Each will be described in detail below.

[0022] The basic flow of the interlayer modulation method in the embodiment of the present invention can be referred to figure 2 , mainly including steps:

[0023] A1. Convert the serial data stream into an N-layer data stream for parallel transmission, where N is an integer greater than or equal to 2.

[0024] Based on the idea of ​​layered multiplexing of the layered modulation (LM: Layered Modulation) method in this embodiment, it is necessary to convert the serial data stream into a parallel data stream through serial-to-p...

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Abstract

The invention discloses an interlayer modulation method which takes the interlayer modulation technology as the basis, the amplitude adjustment and / or the phase shift is carried out on signals after the symbol modulation in at least one layer of the interlayer modulation. The invention also provides a corresponding interlayer modulation device and an orthogonal frequency division multiple access method and a transmitter based on the interlayer adjustment proposal. The technical proposal uses the interlayer modulation technology based on layered interleaved coding, thereby improving the spectrum utilization rate of a system; furthermore, the technical proposal adopts the interlayer amplitude adjustment and / or the phase shift, thereby increasing spatial distance of a constellation point which is corresponding to a transmission symbol in symbol modulation mapping, reducing the interference in the constellation points (namely interlayer interference) after the superposition of a plurality of layers of signals and improving the anti-interference performance of the interlayer modulation system.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an interlayer modulation method and device as well as a corresponding orthogonal frequency division multiple access method and transmitter. Background technique [0002] In recent years, a multi-carrier transmission technology represented by Orthogonal Frequency Division Multiplexing (OFDM: Orthogonal Frequency Division Multiplexing) has attracted widespread attention. OFDM is one of the multi-carrier modulation (MCM: Multi-Carrier Modulation) technologies. Its main idea is to divide the carrier (channel) into several orthogonal sub-carriers, and convert the high-speed data signal into several parallel low-speed sub-data streams ( or several sub-data streams from different users), and then encode and use symbol modulation methods such as phase shift keying (PSK: Phase Shift Keying) or quadrature amplitude modulation (QAM: Quadrature Amplitude Modulation) to modulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 陈大庚王艺梁伟光
Owner HUAWEI TECH CO LTD
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