On uplink performance of massive MIMO relaying with hybrid multiuser detection
| Autor: | Wei Xu, Hong Shen, Jin dan Xu, Yucheng Wang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
MIMO 020302 automobile design & engineering 020206 networking & telecommunications 02 engineering and technology Topology Transmitter power output Multiuser detection law.invention Base station 0203 mechanical engineering Relay law Telecommunications link 0202 electrical engineering electronic engineering information engineering Radio frequency Computer Science::Information Theory Communication channel |
| Zdroj: | WCSP |
| DOI: | 10.1109/wcsp.2017.8171017 |
| Popis: | This paper considers a multiuser massive multiple-input multiple-output (MIMO) uplink transmission with the help of an N r -antenna amplify-and-forward (AF) relay. Assume that the base station (BS) is equipped with a large array of N d antennas but supported by a far smaller number, K, of radio-frequency (RF) chains, which greatly reduce hardware complexity and cost. A hybrid processing is proposed to fit the limited RF chains. By first deriving some statistics of the complicated phase-aligned compound two-hop channel matrix, we obtain a tight bound of the achievable rate in closed form for the system using hybrid detection. It is shown that the ergodic rate, logarithmically proportional to N d , is a function of a scaled product of equivalent signal-to-noise ratios (SNRs) of two hop channels. The scaling factor, to some extent, represents the effect of limited RF chains. Power-saving strategies are further investigated. User transmit power and relay power can be respectively scaled down by 1/Na d and 1/N1−a d (0 ≤ a ≤ 1) simultaneously with an asymptotically unchanged sum rate. Simulation results verify that the proposed hybrid processing incurs limited rate loss compared to fully-digital detection. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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