Abstract
We investigate the problem of sum-rate maximization of a secondary link of full-duplex generalized frequency division multiplexing (GFDM) radios operating over a spectrum hole, which is surrounded by two active primary adjacent channels. Thus, the secondary transmissions must be below an adjacent channel interference (ACI) threshold. In-band distortions and several interference terms are also caused by phase noise, in-phase (I) and quadrature (Q) imbalance, carrier frequency offset (CFO) and the nonlinear power amplifier (PA). Analog domain and digital domain self-interference (SI) cancellation is also considered. We study the two cases of two independent oscillators for local transmitter and receiver and one common shared oscillator. We derive the powers of residual SI, desired signal, interference signal and noise, signal-to-interference-plus noise ratio (SINR) and the power spectral density (PSD) of the transmit signal. By using successive convex approximations, we solve the sum-rate maximization problem. Finally, we show that in full-duplex radios under certain RF impairments, GFDM may double the sum rate compared to that of orthogonal frequency division multiplexing (OFDM).
Highlights
T HE CRITICAL targets of fifth generation (5G) wireless networks include 1000 times increase in the data rate, below 100 ms latency, 50% network cost reduction, and 95% availability in bad coverage locations [1], [2]
WORK CONTRIBUTIONS In this paper, we study the generalized frequency division multiplexing (GFDM)-based full-duplex link over a spectrum hole with two neighboring active primary users (PUs) (Fig. 2)
This paper has investigated the performance of full-duplex GFDM transceivers operating over a spectrum hole in the presence of phase noise, IQ imbalance, carrier frequency offset (CFO), and nonlinear power amplifier (PA)
Summary
T HE CRITICAL targets of fifth generation (5G) wireless networks include 1000 times increase in the data rate, below 100 ms latency, 50% network cost reduction, and 95% availability in bad coverage locations [1], [2]. To the best of our knowledge, the GFDM fullduplex link over a spectrum hole has not been investigated by considering active analog and digital SI cancellations, phase noise, IQ imbalance, CFO and nonlinear PA. Optimal power for maximizing sum rate of SU link under the constraints of maximum tolerable interference power on PU bands was derived In this current paper, we greatly extend [38] and consider the impact of the nonlinear power amplifier. In [36], [40], we model and analyze the full-duplex GFDM transceiver in presence of phase noise, IQ imbalance and CFO by considering both analog and digital cancellations and propose receiver filter to maximize the desired signalto-interference ratio.
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