IMPROVED TRELLIS CODING TECHNIQUE TO INCREASE ADJACENT CHANNEL INTERFERENCE PROTECTION RATIO IN LAND MOBILE RADIO SYSTEMS UNDER PEAK POWER CONSTRAINTS.

摘要

optimum communication system (6) with an encoder (94) and a topographer (96) and two parallel branches (i and q) each of which includes a filter (98a, 98b) program, a digital / analog converter (99a and 99b), a low pass filter (100a, 100b). a modulator. the (102a and 102b) in series.the two modulators are coupled to a counter (97) which transmits a signal to a rf transmit antenna (103). a second antenna (104) is coupled to a first frequency block (106), a filter (107), a second rf frequency block (109), an analog to digital converter (108) and a decoder (111).the encoder is optimized by selecting the desired minimum euclidean distance between symbols multiplied by the ratio of the average transmit power the peak transmit power, an alphabet code and a number of constellation points. all states and all possible coding symbols are permuted to obtain input a number of sets of coding.it determines the minimum distance between the symbols used and the ratio of gdp and corporate power for each set of coding. the encoder is adapted to output a set of coding (with a ratio of gdp is more important in corporate power ratio greater protection against interference of neighboring channels.in a preferred implementation, we choose the ratio of gdp and corporate power.the encoder is adapted to an output coding sets u with the minimum distance between the symbols of the most important code multiplied by the ratio of the average transmit power the peak transmit power, which is also a gap above the gdp ratio ratio minimum power.