Abstract:Concatenation is a method of building long codes out of shorter ones, it attempts to meet the problem of decoding complexity by breaking the required computation into manageable segments.
Concatenated Continuous Phase Frequency Shift Keying (CPFSK) facilitates powerful error correction. CPFSK also has the advantage of being bandwidth efficient and compatible with non-linear amplifiers. Bandwidth efficient concatenated coded modulation schemes were designed for communication over Additive White Gaussian noise (AWGN), and Rayleigh fading channels. An analytical bounds on the performance of serial concatenated convolutional codes (SCCC), and parallel concatenated convolutionalcodes (PCCC), were derived as a base of comparison with the third category known as hybrid concatenated trellis codes scheme (HCTC). An upper bound to the average maximum-likelihoodbit error probability of the three schemes were obtained. Design rules for the parallel, outer, and inner codes that maximize the interleaver's gain were discussed. Finally, a low complexity iterative decoding algorithm that yields a better performance is proposed.
A new wireless communication system denoted as Multi-Code Multi-Carrier CDMA (MC-MC CDMA), which is the combination of Multi-Code CDMA and Multi-Carrier CDMA, is
Most satellite communication systems are power and bandwidth-limited. In band limited nonlinear satellite applications, various researchers have shown that respectable coding gains can be achieved by Ungerboeck TCM ( trellis coded modulation ) codes [1], which improve error performance without reducing data rates or requiring more bandwidth than conventional uncoded schemes. This is achieved by channel coding with expanded sets of multilevel phase signals, such that the free Euclidean distance is maximized. A coded modulation format is defined over an expanded set of signals varying both in frequency and phase modulation ( FPM ). This special technique combines Frequency Shift Keying ( FSK ) and Phase Shift Keying ( PSK ) modulations. The FPM signal has been transmitted through nonlinear satellite transponder which exhibits amplitude and phase distortion ( AM/AM and AM/PM ), respectively, [2]. The TCM / FPM schemes demonstrate improved performance over TCM / MPSK systems on AWGN and the fading channels.
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