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Method and apparatus for obtaining symbol mapping diversity, generating star map and modulation

A technology of constellation diagram and modulation method, which is applied in the direction of modulated carrier system, phase-modulated carrier system, digital transmission system, etc. It can solve the problems of bit channel fading and noise, high block error rate of the receiver, etc., and achieve the reduction of block error rate , The effect of eliminating interlayer interference

Inactive Publication Date: 2009-07-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the process of implementing the present invention, the inventor found that at least the following problems existed in the prior art: the above-mentioned prior art used the unequal power mapping method in the generation process of high-order QAM, which resulted in low-power layer transmission in the channel. The bits are easily affected by channel fading and noise, which makes the block error rate of the receiver higher

Method used

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  • Method and apparatus for obtaining symbol mapping diversity, generating star map and modulation
  • Method and apparatus for obtaining symbol mapping diversity, generating star map and modulation
  • Method and apparatus for obtaining symbol mapping diversity, generating star map and modulation

Examples

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Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1, a modulation device, refer to image 3 , the device consists of:

[0062] The serial-to-parallel conversion unit 301 is configured to perform serial-to-parallel conversion on the input bit stream, and distribute the serial-to-parallel converted bit stream to the basic modulation unit 302 of different layers.

[0063] The basic modulation unit 302 is used to modulate the bit stream output by the serial-to-parallel conversion unit 301 using the same modulation method, usually using equal-power Binary Phase Shift Keying (BPSK, Binary Phase Shift Keying) or QPSK modulation method. There are at least two basic modulation units; wherein, BPSK is a special case of QPSK, and the QPSK symbol can be formed by superposition of two BPSK symbols, and the phase difference of the two BPSK symbols is

[0064] The phase deflection unit 303 is configured to perform phase deflection on the basic modulation symbols output by the basic modulation unit 302 according to diffe...

Embodiment 2

[0072] Embodiment 2, a transmitter, refer to Figure 4 , the transmitter includes:

[0073] A channel coding unit 401, configured to perform redundancy coding on the received data stream. The received bit stream is usually coded redundantly by a coding method such as a low-density parity-check code, a Turbo code, or a convolutional code (Convolutional Code).

[0074] The interleaving unit 402 is configured to rearrange the bit stream output by the channel coding unit 401 according to certain rules.

[0075] The modulation device 403 is configured to perform serial-to-parallel conversion on the bit stream output by the interleaving unit 402, and distribute the bit stream obtained by the serial-to-parallel conversion to different layers, and then modulate the bit streams corresponding to different layers to obtain basic modulation symbols, and according to Different phase deflection factors perform phase deflection on the basic modulation symbols output by at least two layers,...

Embodiment 3

[0076] Embodiment three, a kind of transmitter, by Figure 5 It can be seen that the difference between the third embodiment and the second embodiment is that the interleaving unit is built into the modulation device, and the modulation device first performs serial-to-parallel conversion on the bits output by the channel coding unit, and distributes the bit stream obtained by the serial-to-parallel conversion to different layers , and use different interleaving units to rearrange the bit streams corresponding to different layers, and then perform angle rotation and superposition modulation.

[0077] It can be seen from the above that since the transmitters described in Embodiments 2 and 3 both include modulation devices, the embodiment of the present invention performs phase deflection on the basic modulation symbols output by at least two layers according to different phase deflection factors, so that at least two layers use equal The angular rotation of the power is superimp...

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Abstract

The embodiment of the invention discloses a method and a device which are used for obtaining symbol mapping diversity, generating a star map and modulating. The modulating method comprises the following steps: a same modulating way is adopted for modulating a bit stream which is input in each layer, thus obtaining a modulating symbol, and the bit stream is a data stream of the same business of the same user; phase deflection of the modulating symbols which are output by at least two layers is implemented according to different phase deflecting factors; and superposition of the modulating symbols of each layer, which are output after the phase deflection, is implemented. The symbol mapping diversity obtaining method comprises the following steps: feedback detecting error information of a transmission signal that is sent by a receiving terminal is received, and retransmission is launched; angle rotating superposition of the basic modulating symbol corresponding to the transmission signal is implemented according to the information, thus obtaining a retransmission signal, and the rotating superposition angle of the retransmission signal is different from the rotating superposition angle of the transmission signal; and combined treatment of the transmission signal and the retransmission signal is implemented, thus obtaining the symbol mapping diversity. The modulating method and the symbol mapping diversity obtaining method of the embodiment can decrease the block error rate of the receiving terminal and eliminate the interlayer interference during retransmission.

Description

technical field [0001] The embodiments of the present invention relate to the communication field, and in particular to methods and devices for obtaining symbol mapping diversity, generating constellation diagrams, and modulating. Background technique [0002] Currently in communication systems, phase-shift keying (PSK, Phase-shift keying) or quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) is the most widely used modulation technique. [0003] From the perspective of hierarchical modulation, high-order QAM modulation is to increase the distance between constellation points and reduce the crosstalk between constellation points. For a modulation method with a relatively high order (for example, 16QAM), unequal power mapping is usually used to map the bit stream to the constellation diagram, wherein the unequal power mapping is to map some bits to constellation points with higher power, and the Other bits are mapped to lower power constellation points. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/20H04L27/36H04L1/00
CPCH04L27/3483H04L1/1893H04L27/3488
Inventor 陈大庚王艺
Owner HUAWEI TECH CO LTD
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