NEW ROTATIONALLY INVARIANT TItELLIS CODES FOR 8PSK MODULATION
نویسنده
چکیده
Rotationally invariant trellis codes often are of significant importance for fast and easy receiver synchronization and acquisition. With the help of 2-dimensional symbol constellations new 8PSK trellis codes are presented that are rotationally invariant to phase shifts by multiples of a/4 without an increase in complexity over noninvariant codes. (1 -dimensional coding: 1D-coding). Recently trellis codes were Dresented where two consecutive channel symbols are combined to one code symbol (often referred to as 2D-coding). This technique has been used for 8PSK modulation, e.g. to derive high-rate codes (4 or to optimize performance to obtain rotationally invariant 8PSK trellis codes. characteristics 151. I n this paper 2D-coding is used
منابع مشابه
Performance of Generalized Bch Codes
Performance of BCH Codes over GF(q'). (December 1996) Kuntal Dilipsinh Sampat, B. E. , University of Bombay Chair of Advisory Committee: Dr. Jay N. Livingston The main work involved in this thesis is the implementation of a generalized encoder and decoder for BCH codes. The special feature of the implementation is that it works over all finite fields and their extensions as opposed to earlier i...
متن کاملTurbo Trellis Coded Modulation with Iterative Decoding for Mobile Satellite Communications
In this paper, analytical bounds on the performance of parallel concatenation of two codes, known as turbo codes, and serial concatenation of two codes over fading channels are obtained. Based on this analysis, design criteria for the selection of component trellis codes for MPSK modulation, and a suitable bit-by-bit iterative decoding structure are proposed. Examples are given for throughput o...
متن کاملاستخراج ویژگیهای نوین برای طبقه بندی مدولاسیون با استفاده از یک دمدولاتور 8PSK
In this paper a feature-based modulation classification algorithm is developed for discriminating PSK signals. The candidate modulation types are assumed to be QPSK, OQPSK, π/4 DQOSK and 8PSK. The proposed method applies an 8PSK baseband demodulator in order to extract required features from observed symbols. The received signal with unknown modulation type is demodulated by an 8PSK demodulator...
متن کاملTrellis group codes for the Gaussian channel
In this paper, trellis group codes are introduced as an extension of Slepian group codes to codes over sequence spaces. A trellis group code is defined over R” as the orbit of a bi-infinite “seed sequence”, 20 E (W”)‘, under an infinite, defining group of transformations. This group of transformations is generated by a symbolic system. The theory is developed by combining a nontrivial extension...
متن کاملDifferential Turbo Coded Modulation over Unsynchronized Channels
A simple serially concatenated turbo code using differential 8PSK modulation as the inner code and a [3,2,2] parity code as the outer code is studied. This inner code allows for noncoherent operation, but is decoded coherently according to turbo principles with iterative exchange of extrinsic probabilities. Results show a turbo cliff at 4.4 dB, about 1.5 dB away from the 8PSK channel capacity. ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004