Effect of channel aging on the sum rate of uplink massive MIMO systems

• This paper investigates the achievable sum-rate of uplink massive multiple-input multiple-output (MIMO) systems considering a practical channel impairment, namely, aged channel state information (CSI). Taking into account both maximum ratio combining (MRC) and zero-forcing (ZF) receivers at the base station, we present tight closed-form lower bounds on the sum-rate for both receivers, which provide efficient means to evaluate the sum-rate of the system. More importantly, we characterize the impact of channel aging on the power scaling law. Specifically, we show that the transmit power of each user can be scaled down by 1/√M, which indicates that aged CSI does not affect the power scaling law; instead, it causes only a reduction on the sum rate by reducing the effective signal-to-interference-and-noise ratio (SINR).

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Keyword

Signal to noise ratio

Signal-to-interference and noise ratios

MIMO systems

Communication channels (information theory)

Achievable sum rates

Zero forcing receivers

Signal interference

Power-scaling

Spurious signal noise

Maximum ratio combining

Transmit power

Channel impairment

Channel state information

Massive multiple-input- multiple-output system (MIMO)

Information theory

Publication and Content Type

kon (subject category)

ref (subject category)