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Wireless communication is one of the most vibrant areas in the communication field today. In the last few years, the telecommunication industries development has focused on an intensive use of broadband systems, with high quality features. For this issue, new technologies with high transmission abilities have been designed. There is one fundamental aspects of wireless communication that make the problem...
Receivers for horizontally encoded LTE based MIMO-OFDM systems are considered in this paper. Adaptive modulation and coding (AMC) is used as well as precoding. The linear minimum mean square error (LMMSE), successive interference cancellation (SIC) and K-best list sphere detectors (LSD) are compared. The receivers were designed and implemented for 2??2 and 4??4 antenna systems and meet the decoding...
In the emerging broadband wireless networks such as IEEE 802.16m and LTE-A networks which employ universal frequency reuse-1, the cell coverage is predominantly limited by the co-channel interference. Bit level data repetition, and conventional multi-antenna maximal-ratio-combining (MRC) techniques are typically used to improve the signal-to-interference-plus- noise ratio (SINR) at the receiver. Simple...
A proposed fractional Fourier domain communication system (FrFDCS) using transform domain processing is demonstrated as having enhanced interference avoidance capability under adverse environmental conditions. The basic idea for this system is to synthesize an intelligent adaptive waveform in the fractional Fourier domain at both the transmitter and receiver for avoiding spectral crowded regions....
Multiple-input multiple-output (MIMO) wireless communication systems enhance reliability and improve throughput for a given total transmit power. In actual systems, the channel and noise parameters must be estimated to capture the MIMO gains. In this paper, we couple a direct, q-ary Galois field [GF(q)], low-density parity-check (LDPC) space-time coding and modulation scheme with a receiver that iterates...
Cognitive radio systems offer the opportunity to improve spectrum utilization by detecting unoccupied spectrum bands and adapting the transmission to those bands while avoiding the interference to primary users. This novel approach to spectrum access introduces unique functions at the physical layer: reliable detection of primary users and adaptive transmission over a wide bandwidth. In this paper,...
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