Space time block coding (STBC) MC-CDMA (Multicarrier Code Division Multiple Access) signal blind identification method based on cyclostationarity

A technology with MC-CDMA and cyclostationary characteristics, which is applied in the field of blind signal recognition, and can solve the problems of high calculation load at the receiving end and high power consumption of the mobile station.

Active Publication Date: 2015-03-04
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The disadvantage of receive diversity is that the computational load at the receiving end is high, which may lead to high power consumption of the mobile station in the downlink

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  • Space time block coding (STBC) MC-CDMA (Multicarrier Code Division Multiple Access) signal blind identification method based on cyclostationarity
  • Space time block coding (STBC) MC-CDMA (Multicarrier Code Division Multiple Access) signal blind identification method based on cyclostationarity
  • Space time block coding (STBC) MC-CDMA (Multicarrier Code Division Multiple Access) signal blind identification method based on cyclostationarity

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Embodiment Construction

[0032] Considering the uplink of a synchronous STBC MC-CDMA system with K users, the baseband space-time block code MC-CDMA transmitter of the kth user is as follows: figure 1 As shown, the mobile terminal has M=2 transmitting antennas, and the base station has a single receiving antenna. Corresponding to the two transmitting antennas, each user uses two different spreading codes, assuming that the number of subcarriers and the spreading factor are equal. order d (k) (t) is the information symbol sequence sent by user k, using Alamouti's space-time block code scheme, at time 2t-1 and 2t (t is the number of space-time code blocks, t=1, 2, ..., LT) two symbols d (k) (2t-1) and d (k) (2t) is input to the space-time encoder, and the following code matrix is ​​output:

[0033] S ( k ) (...

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Abstract

The invention claims to protect a space time block coding (STBC) MC-CDMA (Multicarrier Code Division Multiple Access) signal blind identification method based on the cyclostationarity, and belongs to the technical field of signal processing. The method comprises the following steps: establishing a selection standard of signal correlation functions according to the baseband physical model, signal construction and matrix representation of an STBC MC-CDMA system, and estimating corresponding fourth-order cumulants of the correlation functions; combining a fourth-order cyclic cumulant with the parameter of a channel to establish a cyclic statistic; and extracting a detection threshold according to the detection of cycle frequency, and making a judgment by comparing the detection threshold with the cyclic statistic to realize identification. As indicated by computer simulation, STBCMC-CDMA signals can be effectively identified with low complexity by adopting an algorithm adopted in the invention, and working under the condition of low input signal to noise ratio is feasible. Meanwhile, compared with a conventional identification algorithm, the algorithm adopted in the invention has the advantage that the influence of random noise is reduced by using the advantage of the fourth-order cyclic cumulant, so that the system performance is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, and more specifically to a signal blind recognition method. Background technique [0002] Multicarrier Code Division Multiple Access (MC-CDMA, Multicarrier Code Division Multiple Access) technology is the combination of Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) and Code Division Multiple Access (CDMA). advantage. In wideband systems, MC-CDMA systems convert wideband frequency-selective channels into a series of narrowband flat fading channels. The disadvantage of receiving diversity is that the calculation load at the receiving end is very high, which may lead to a large power consumption of the mobile station in the downlink. Diversity gains can also be obtained by using space-time coding at the transmitter, and only simple linear processing is required for decoding at the receiver. Space-time codes organically combine antenna tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06
CPCH04L1/0038H04L1/0643H04L1/0668
Inventor 张天骐裴光盅张刚高超
Owner CHONGQING UNIV OF POSTS & TELECOMM
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