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Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof

A channel multiplexing and transmission system technology, applied in the direction of signal channels, multi-frequency code systems, etc., can solve the problem of not being able to obtain channel capacity, multiplexing gain, throughput, etc., and achieve the effect of improving the transmission rate

Inactive Publication Date: 2011-01-12
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Cyclic delay diversity technology can improve the reliability of existing wireless communication systems in terms of energy efficiency, but it cannot obtain the multiplexing gain of channel capacity to improve the throughput of the system

Method used

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  • Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof
  • Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof
  • Transmitting device and receiving device of spectral domain channel multiplexing transmission system and method thereof

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Embodiment 1

[0044] This embodiment describes a transmitting device of a spectral domain channel multiplexing transmission system, such as figure 1 As shown, the transmitting device is embedded with a cyclic delay modulation module, a cyclic delay diversity OFDM transmitting module, and a serial / parallel processing module; the serial / parallel processing module is respectively connected with the cyclic delay modulation module and the cyclic The delay diversity OFDM transmitting module is connected, and the cyclic delay modulation module is also connected with the cyclic delay diversity OFDM transmitting module.

[0045] The cyclic delay modulation module is used to map the information bit stream into a cyclic delay modulation vector; the cyclic delay diversity OFDM transmitting module is used to convert the information bit stream into an orthogonal amplitude modulation symbol, and then according to the cyclic The delay modulation vector performs corresponding CDD-OFDM modulation processing ...

Embodiment 2

[0064] This embodiment describes the transmitting device of the spectral domain channel multiplexing transmission system based on cyclic delay modulation, which adopts N T root antenna. The input information bit stream is divided into two independent information bit streams through serial / parallel processing. Among them, one information bit stream is sent through a traditional cyclic delay diversity orthogonal frequency division multiplexing (CDD-OFDM) transmitting module; the other information bit stream is sent through a cyclic delay modulation (CDM) module.

[0065] In the CDD-OFDM transmitting module, an information bit stream passes through two processing units of Forward Error Control Coding (FECC) and Quadrature Amplitude Modulation (QAM), and outputs QAM digital modulation symbols. Here, the transmission process of the lth OFDM symbol is taken as an example for illustration, such as figure 2 shown.

[0066] First, the CDD-OFDM transmitting module processes N data s...

Embodiment 3

[0080] This embodiment is a spectral domain channel multiplexing transmission system based on cyclic delay modulation with the number of transmitting antennas being 2, where N T =2,N=32,N G =8. In the CDD-OFDM transmission module with 2 transmit antennas, there is only one independent cyclic delay variable Δ 2 . Within a unit observation length, the process of mapping the coded information into a cyclic delay vector in the cyclic delay modulation process can be performed according to Table 1. Figure 5 with Figure 6 Respectively describe the circular autocorrelation function diagram of CDD-OFDM signal when the transmitted coding bits are 00100 and 01010.

[0081] Table 1

[0082] coding bits

[0083] 01001

[0084] 11110

[0085] The present invention embeds a cyclic delay modulation module in the existing CDD-OFDM standard system, realizes the multiplexing of OFDM modulation channels and cyclic delay modulation channels, and solves the pr...

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Abstract

The invention discloses a transmitting device and receiving device of a spectral domain channel multiplexing transmission system and method thereof. The emitting device is characterized in that a cyclic delay modulation module is overlaid on a CDD-OFDM (Cyclic Delay Diversity-Orthogonal Frequency Division Multiplexing) transmitting module; the cyclic delay modulation module is used for independently mapping an information bit stream into a cyclic delay modulation vector; and the cyclic delay diversity-orthogonal frequency division multiplexing transmitting module is used for carrying out corresponding cyclic shift operation on an orthogonal frequency division multiplexing symbol according to a modulated cyclic delay vector and modulating the cyclic self-correlation function of a CDD-OFDM signal, therefore a spectral domain channel is established. The invention realizes the multiplexing of an OFDM modulation channel and a cyclic delay modulation channel by embedding the cyclic delay modulation module into the traditional CDD-OFDM standard system, thereby solving the problem that the spectral domain channel is multiplexed on a multi-carrier frequency domain channel; and in addition,the invention obtains the cyclic delay diversity without consuming extra transmitting power and bandwidths and also enhances the transmission rate of the system.

Description

technical field [0001] The invention belongs to the technical field of communications, and relates to a channel multiplexing transmission system, in particular to a transmitting and receiving device and method of a spectrum domain channel multiplexing transmission system. Background technique [0002] As a multi-antenna diversity technology with good standard compatibility, cyclic delay diversity (Cyclic Delay Diversity, CDD) has greatly enhanced the existing standard Orthogonal Frequency Division Multiplexing (OFDM) technology, enabling it to Enough space diversity gain can be obtained in the wireless environment with rich scattering. Cyclic delay diversity processing can convert space diversity into frequency diversity, thus adding more redundancy in the frequency domain of the OFDM system. Different from Space-Time Block Coding (STBC) and Space-Time TrellisCodes (STTC), the cyclic delay diversity technology can be realized only at the sending end, so the enhanced technol...

Claims

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Application Information

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IPC IPC(8): H04L5/02H04L27/26
Inventor 郭海友胡宏林
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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