Optimal training for time-selective wireless fading channels using cutoff rate
EURASIP Journal on Applied Signal Processing
The Adaptive PSAM Design in Cross-Layer
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
Adaptive PSAM in SIMO systems with imperfect CSI in Rayleigh fading channels
Proceedings of the 2009 International Conference on Hybrid Information Technology
A simple bit error probability analysis for square QAM in Rayleigh fading with channel estimation
IEEE Transactions on Communications
Optimized rate-adaptive PSAM for MIMO MRC systems with transmit and receive CSI imperfections
IEEE Transactions on Communications
IEEE Transactions on Image Processing
On energy efficiency of pilot assisted modulation schemes
Sarnoff'10 Proceedings of the 33rd IEEE conference on Sarnoff
Packet error probability of a transmit beamforming system with imperfect feedback
IEEE Transactions on Signal Processing
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Adaptive modulation requires channel state information (CSI), which can be acquired at the receiver by inserting pilot symbols in the transmitted signal. We first analyze the effect linear minimum mean square error (MMSE) channel estimation and prediction errors have on bit-error rate (BER). Based on this analysis, we develop adaptive pilot symbol assisted modulation (PSAM) schemes that account for both channel estimation and prediction errors to meet a target BER. While pilot symbols facilitate channel acquisition, they consume part of transmitted power and bandwidth, which in turn, reduces spectral efficiency. With imperfect (and thus, partial) CSI available at the transmitter and receiver, two questions arise naturally: how often should pilot symbols be transmitted, and how much power should be allocated to pilot symbols. We address these two questions by optimizing pilot parameters to maximize spectral efficiency.