Simplex signaling

Abstract: This paper presents a method for the assignment of simplex signals in a circular trellis-coded modulation (CTCM) scheme. A background is given on both CTCM and simplex signaling. The CTCM trellis is then shown to have various properties that allow symbol assignment to be carried out in a systematic manner.

Abstract: A method for multiplexing clock and signaling includes generating reference frequency source information, system timing information and simplex signaling by main control clock board, multiplexing said information and signaling to be a serial data stream being transmitted on each service signal board, obtaining required information by each service single board according to serial data stream. The system for realizing the method consists of main control clock board, at least one service board, at least one physical bus for connecting said clock board to said service board.

Abstract: Signal sets are considered which give rise to multitone M-ary frequency shift keying (MT-MFSK) modulation, which represents a bandwidth efficient alternative to optimum performance modulation schemes for the AWGN channel (simplex signaling for coherent detection and orthogonal signaling for noncoherent detection). The channel is examined in the power-limited region, and it is shown that MT-MFSK modulation exhibits optimum asymptotic performance with bandwidth efficiency gains of an order of magnitude over the orthogonal MFSK modulation technique for sets of finite size. MT-MFSK is viewed as a class of signal sets derived from combinatorial designs. The main properties and structure of such sets are presented and exploited to derive tight upper bounds for the error probability. >