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Coding method and device and decoding method and device

A technology of a decoding method and an encoding method, which is applied to the encoding method and device and decoding method and device of frequency diversity codes, and the field of orthogonal frequency division multiplexing ultra-wideband systems, and can solve the problems of low code rate, high decoding complexity, and shifting Increase the number of bit registers and other issues to achieve the effects of reducing interference information, improving accuracy, and reducing complexity

Inactive Publication Date: 2008-03-26
HUAWEI TECH CO LTD
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  • Claims
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Problems solved by technology

[0006] However, each trellis state transition in the above-mentioned prior art only contains one bit of information, so that the rate of frequency diversity coding is low, which limits the high-speed data transmission of the system. At the same time, the number of states of the encoder must be at least equal to the modulation order If the number of states increases, the number of shift registers in the encoder will inevitably increase, so that the complexity of maximum likelihood sequence decoding will also increase exponentially
Therefore, the defect of the prior art based on the space-time trellis code is that the code rate is low and the complexity of decoding is relatively large

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  • Coding method and device and decoding method and device
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  • Coding method and device and decoding method and device

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Embodiment 1

[0044] Referring to Fig. 1, Fig. 1 is a flow chart of Embodiment 1 of the encoding method of the present invention, and what this embodiment describes is a kind of frequency division multiplexing UWB system using space-time block coding on the basis of frequency diversity code -time encoding method, specifically comprising the following steps:

[0045]Step 101. Modulate the input data, and then group the data generated by the modulation. Assuming that the system inputs 4K bits, 2K QPSK symbols are generated after quadrature phase shift keying (QPSK, Quadrature Phase Shift Keying) modulation, and then the QPSK symbols are grouped according to the matrix generated by space-time coding, for example, the number of subbands is 2 , group two symbols into one group; when the number of subbands is 3 or 4, group 4 symbols into a group; when the number of subbands is 5, group 8 symbols into a group, and so on.

[0046] Step 102, perform space-time block coding on all grouped data, and ...

Embodiment 2

[0051] Referring to Fig. 2, Fig. 2 is a flow chart of Embodiment 2 of the encoding method of the present invention. What this embodiment describes is a frequency-diversity code-based Orthogonal Frequency-Division Multiplexing UWB system based on space-time block coding. -The frequency coding method specifically comprises the following steps:

[0052] Step 201. Modulate the input data, and then group the data generated by the modulation. Assuming that the system inputs 4K bits, 2K QPSK symbols are generated after QPSK modulation, and then QPSK symbols are grouped according to the matrix generated by space-time coding. For example, the number of subbands is 2, and two symbols are divided into one group; the number of subbands 3 or 4, 4 symbols are grouped; when the number of subbands is 5, 8 symbols are grouped and so on.

[0053] Step 202, perform space-time block coding on all grouped data, and then divide the data generated by the coding into multiple data according to the n...

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Abstract

The invention discloses a coding method based on a frequency diversity coding orthogonal frequency division multiplexing superwide band system, the method comprises: modulating input data and space-time block coding the modulated data, then mapping the coded data, mapping coded data corresponding to each subband to corresponding subcarriers in different orthogonal frequency division multiplexing symbols, or mapping coded data corresponding to each subband to corresponding subcarriers in one orthogonal frequency division multiplexing symbol. According to the coding method, the invention also provides a coding device, a coding method and a decoding device. The invention can make the system transmit data with a higher speed, also can guarantee the system obtain higher diversity gain. Moreover, the decoding complexity of the invention is lower, while the decoding accuracy is higher, thereby performance of the system is improved.

Description

technical field [0001] The invention relates to an orthogonal frequency division multiplexing ultra-wideband system in the field of wireless communication, in particular to a coding method and device and a decoding method and device of frequency diversity codes. Background technique [0002] Due to the limitation of spectrum planning, the transmission power spectrum of ultra-wideband signals must be smaller than a certain threshold value. At present, MB-OFDM (Multiple Band-Orthogonal Frequency Division Multiplex) scheme is used to expand the spectrum, but The MB-OFDM scheme requires fast and accurate frequency synchronization, which puts forward very high requirements on the front end of the receiver, and the instantaneous power spectrum of this scheme fluctuates greatly, which may exceed the specified spectrum limit. [0003] In order to solve the problems existing in the MB-OFDM scheme, a frequency diversity code orthogonal frequency division multiplexing ultra-wideband sy...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 欧细华毕光国张在琛曹明伟朱学生李云岗
Owner HUAWEI TECH CO LTD
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