Time space encoding method of distributed quadrature network
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A space-time coding, orthogonal network technology, applied in the direction of preventing/detecting errors through diversity reception, electrical components, digital transmission systems, etc., to achieve the effect of large coding gain
Inactive Publication Date: 2009-07-29
XIDIAN UNIV
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Embodiment 1
[0073] refer to figure 2 and image 3 , in two mobile users, two relay nodes, one destination node, and the distributed orthogonal network space-time coding method under the situation of L=2, carry out according to the following steps:
[0074] Step 1, N=2 mobile users broadcast data information to two relay nodes and the destination node with L=2 symbol periods;
[0075] Step 2, the first relay node R 1 The received data information is demodulated according to the maximum likelihood method to obtain demodulated data
[0076] Step 3, the second relay node R 2 The received data information is demodulated according to the maximum likelihood method to obtain demodulated data
[0077] Step 4, assuming that the i-th mobile user broadcasts data x to the two relay nodes and the destination node in the l-th symbol period i (l) From the modulation symbol set Ω, calculate the Cartesian product Ω of the modulation symbol set Ω N×L =Ω 4 , i=1,2, l=1,2. from Ω 4 Randomly take...
Embodiment 2
[0107] refer to figure 2 and Figure 4 , in the case of 2 mobile users, 2 relay nodes, and 1 destination node, and L=4, the distributed orthogonal network space-time coding method is carried out according to the following steps.
[0108] In the first step, N=2 mobile users broadcast data information to two relay nodes and the destination node with L=4 symbol periods;
[0109] In the second step, the first relay node R 1 The received data information is demodulated according to the maximum likelihood method to obtain demodulated data
[0110] The third step, the second relay node R 2 The received data information is demodulated according to the maximum likelihood method to obtain demodulated data
[0111] The fourth step, assuming that the i-th mobile user broadcasts the data x to the two relay nodes and the destination node in the l-th symbol period i (l) From the modulation symbol set Ω, calculate the Cartesian product Ω of the modulation symbol set Ω N×L =Ω 8 , w...
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Abstract
The invention discloses a space time coding method of a distributed type orthogonal network, which mainly solves the problem that a plurality of relay nodes in the prior art can not forward data for a plurality of mobile users simultaneously. The method comprises the following steps: N mobile users broadcast data information to a destination node and two relay nodes by L symbol cycles; each relay node carries out modulation to the received data information and calculates the power control factor thereof according to the modulation mode of the mobile users and the channel fading characteristics; two different complex vectors Theta 1 and Theta 2 are respectively adopted to carry out left multiplication to modulate the data to obtain two compression symbols; and by using the two compression symbols and the calculated power control factor, a corresponding row of a space time coding matrix C of the distributed type orthogonal network is formed. The invention can lead the system throughput to reach L / (L+2) symbol / user / symbol cycle to obtain coding gain and diversity gain larger than network coding of a complex domain and is used for a wireless communication with a plurality of relay nodes to help the mobile user to forward data.
Description
technical field [0001] The invention belongs to the field of wireless communication networks, and relates to network coding technology and distributed space-time coding technology. Specifically, it aims at designing a wireless communication network with N mobile users, M relay nodes and a destination node. Space-time coding method for distributed networks to improve network throughput and transmission performance for mobile users. Background technique [0002] Using relays to help mobile users forward data can obtain additional diversity gain and improve the bit error BER performance of the receiving end. It is an effective means to improve the call quality of mobile users at the edge of the cell. However, in a large-scale wireless relay communication network, usually multiple source nodes and multiple relay nodes coexist. Traditional relay schemes, including single-antenna relay and MIMO relay, need to forward data one by one for each source node. , so that the transmissio...
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