A Secure Transmission Method Based on Symbol Separation and Beamforming in Untrusted Relay Networks
A relay network and secure transmission technology, applied in transmission systems, radio transmission systems, location diversity, etc., can solve problems such as cooperative interference and waste of transmission power
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[0052] The specific embodiment of the present invention comprises the following steps:
[0053] first time slot
[0054] In the first time slot of information transmission, operations such as relay selection, precoding design, symbol separation and beamforming, and relay reception are completed respectively. The detailed process is described as follows:
[0055] Define channel matrix means from Channel vector (1≤i≤N) to the i-th relay.
[0056] (1) Relay selection. According to the channel vector Calculate channel gain (||·|| 2 represents the 2-norm of a vector). Select the two relays with the strongest channel gain, namely largest two trunks and Wherein, 1≤i, m, n≤N and m≠n.
[0057](2) Precoding vector and design. for design, it is necessary to send to Ensure that other relays cannot receive in order to guarantee Transmission Security. Similarly, for design, it is necessary to send to Ensure that other relays cannot receive in order ...
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