Hybrid beam forming iterative design method with low complexity

Abstract

The invention discloses a hybrid beam forming iterative design method with low complexity. The method comprises the following steps: 1) analog beam forming design: first step, randomly selecting a vector from a DFT network, and initializing an analog beam forming matrix; second step, fixing the analog beam forming matrix and a receiving end equivalent channel, and then restoring the receiving end equivalent channel through the analog beam forming matrix; third step, fixing an analog pre-encoding matrix, updating an analog receiving matrix by a receiving end through the receiving end equivalent channel, and updating a feedback equivalent channel; fourth step, restoring a transmitting end equivalent channel by a transmitting end by using the equivalent channel; fifth step, fixing the analog receiving matrix, and updating the analog pre-encoding matrix through the transmitting end equivalent channel; repeating the second step to the fifth step until algorithm convergence; 2) digital beam forming design: first step, calculating the equivalent channel according to the determined analog beam forming matrix; and second step, calculating a digital beam forming matrix by using a singular value decomposition method, and performing power allocation by using an irrigation method.

Description

technical field [0001] The invention belongs to the design field of beamforming (including precoding and combined reception) schemes in wireless communication systems, and in particular relates to a low-complexity hybrid beamforming iterative design method in massive MIMO. Background technique [0002] Massive MIMO technology can greatly improve the spectral efficiency and reliability of the system by equipping the base station with an infinitely large number of antenna arrays. In order to take full advantage of the performance gain of massive MIMO, effective precoding techniques are particularly important. Traditional precoding requires each antenna to be connected to a specific radio frequency link (RF). Considering the high cost of radio frequency and high energy consumption, and the number of antennas in massive MIMO systems often reaches hundreds or even thousands, it is impossible to The root antenna is equipped with a specific radio frequency link, which makes the tr...

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Problems solved by technology

Obtaining accurate raw channel state information becomes more difficult

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