Precoding and Signal Shaping for Digital Transmission

Quantitative mapping of fast voltage pulses in tunnel junctions by plasmonic luminescence

“…This method is akin to pulse shaping in optical experiments 23 or pulse optimization in the transmission of digital signals. 24 Fig. 3(c) shows the modified input voltage profiles obtained by multiplying the frequency components of the desired rectangular pulse shape with the inverse transfer function T À1 (v).…”

Signal Shaping to Achieve OOK and PSK Co-Existence for Improved Optical Access Network Performance

“…To do this, the symbols must be selected from the lowest possible region numbers. The principles of signal shaping are found in [14]. A block diagram of the signal shaping circuit is shown in Fig.3.…”

“…In many cases, the well-known Viterbi algorithm and the trellis diagram are used to find a valid code word that yields the minimum power when added to the coset representative. For example, block codes can be described as a trellis diagram, where each code word corresponds to a path in the diagram [14]. In searching for the desired code word, the algorithm uses signal power as a cost.…”

Resource scheduling for TH-precoding adoption on multi-beam satellite downlink signals

“…When planning network, the level of beam boundary is usually set by a 3dB decrease of antenna gain [11]. B is precoding matrix, a is output of precoder, data vector p or modulo device at the transmitter is equivalently used to restrict the power of a to a specific range; F is processing matrix at the transmitter; x is the preprocessing output; H is channel gain; n is noise, y is received signal, G is processing matrix at the receiver, r is output of processing matrix G and â is the output of modulo and decision device at the receiver end [3]- [4]. Therefore, the signals at the receiver end can be expressed as …”

“…In the uplink of satellite systems, co-channel interference can be directly cancelled at the gateway station [1]. In the downlink, signals can be pre-processed before transmitted by using multiple-input multiple-output (MIMO) precoding algorithms such as TH-Precoding algorithm to cancel interference [2]- [3]. However, on-board antenna acts as a spatial filter in multi-beam satellite system, leading to a different interference scenario compared to that of terrestrial system [8]- [11].…”