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Alamouti encoding method based on collaborative constellation mapping

A coding method and constellation mapping technology, which is applied in the direction of preventing/detecting errors through diversity reception, and can solve problems such as poor anti-fading ability and poor block error performance

Inactive Publication Date: 2012-10-10
XIDIAN UNIV
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Problems solved by technology

[0004] However, in the traditional Alamouti space-time code transmission scheme based on linear combination, the signals sent by two transmitting antennas are obtained by linear combination of two uncooperative constellation symbols. poor block performance

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  • Alamouti encoding method based on collaborative constellation mapping
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  • Alamouti encoding method based on collaborative constellation mapping

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Embodiment Construction

[0028] The technical method of the present invention will be further described below through the accompanying drawings and embodiments.

[0029] refer to figure 1 , the specific implementation steps of the present invention include:

[0030] Step 1: The sender divides the input information bit stream into 3 groups for every L bits according to the selected modulation constellation, the number of bits in the first group is 1, and the number of bits in the second group is L 1 , the number of bits in the third group is L 2 . L 1 , L 2 The calculation rule of is: when L is an odd number: When L is an even number: There are many ways to group bits here, for example, the first way: the first bit is the first group, the 2nd to L 1 +1 bit for the second group, the Lth 1 +2~L bit streams are the third group; the second method: the Lth bit is the first group, and the 1st~L 1 bits for the second group, the L 1 +1~L-1 bits are the third group; the third way: the Lth 1 +1 bi...

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Abstract

The invention discloses an Alamouti encoding method based on collaborative constellation mapping, and mainly solves the problems of high block error and worse anti-fading capability of an Alamouti space time code. The method comprises the following steps: dividing the bit stream of a transmitting end into three groups, generating a modulation constellation to map three groups of bits, constructing and combining a collaborative modulation symbol to obtain a transmission symbol, using the Alamouti space time code to transmit the symbol, receiving signals within two symbol periods by a receiving end and constructing a composite receiving signal vector, calculating a zero forcing detection solution vector according to the composite receiving signal vector, using a maximum likelihood estimator to perform first layer judgment on the zero forcing detection solution vector, calculating an European style and performing second layer judgment, and finally performing constellation inverse mapping on the judged result and combining the result to obtain the bit stream. By means of collaborative constellation mapping mode, a better error block function is obtained, the anti-fading capability of the system is enhanced, the communication confidentiality is strengthened at the same time, and the method can be applied to a two-transmit-antenna and one-receive-antenna system.

Description

technical field [0001] The invention belongs to the field of wireless communication, relates to an Alamouti coding method, in particular to an Alamouti coding method based on cooperative constellation mapping, which can be used in a multi-antenna system with two transmissions and one reception. Background technique [0002] An important feature of the next-generation wireless communication system is the adoption of the MIMO system. Compared with the traditional single-input single-output system, the channel capacity of the MIMO system can be doubled. MIMO transmission schemes generally fall into two categories: spatial multiplexing and transmit diversity. Multiplexing can increase system capacity, while diversity can improve reliability. [0003] In order to obtain the full diversity gain of the MIMO system, Alamouti proposed the space-time block code STBC scheme. Its essence is to transmit the same information from two antennas after orthogonal coding. Due to the orthogona...

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Application Information

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IPC IPC(8): H04L1/06
Inventor 宫丰奎王辉葛建华王勇李靖
Owner XIDIAN UNIV
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