Near Maximum Sum-Rate Non-Zero-Forcing Linear Precoding with Successive User Selection

We investigate the problem of finding the linear precoder that maximizes the sum-rate for the vector broadcast channel. In contrast to previous work, we examine the dual uplink problem, where the optimal power allocation must be found. This point of view leads to the observation that considering onl...

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Bibliographic Details
Main Authors: Schmidt, D.A., Joham, M., Hunger, R., Utschick, W.
Format: Conference Proceeding
Language:English
Subjects:
Broadcasting
Downlink
Interference
Receiving antennas
Signal processing
Signal to noise ratio
Telephony
Transmitters
Transmitting antennas
Vectors
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Summary:We investigate the problem of finding the linear precoder that maximizes the sum-rate for the vector broadcast channel. In contrast to previous work, we examine the dual uplink problem, where the optimal power allocation must be found. This point of view leads to the observation that considering only uniform power allocations on a user subset yields nearly optimal performance, simplifying the problem to a combinatorial problem. We furthermore present two algorithms with complexity growing only quadratically with the number of users in the system, but with performance comparable to more complex existing schemes.
ISSN:1058-6393
2576-2303
DOI:10.1109/ACSSC.2006.355136