Robert Morelos-Zaragoza

Learn More
In this paper, theoretical upper bounds and computer simulation results on the error performance of multilevel block coded modulations for unequal error protection (UEP) and multistage decoding are presented. The paper is divided into two parts. In part I, symmetric constellations are considered while in the sequel, asymmetric constellations are analyzed.(More)
In this paper, multilevel coded asymmetric modulation with multistage decoding and unequal error protection (UEP) is discussed. These results further emphasize the fact that unconventional signal set partitionings with asymmetric constellations are more promising than traditional (Ungerboeck-type) partitionings, to achieve unequal error protection(More)
Binary multilevel convolutional codes (CC’s) with unequal error protection (UEP) capabilities are studied. These codes belong to the class of generalized concatenated (GC) codes [1]. Binary CC’s are used as outer codes. Binary linear block codes of short length, and selected subcodes in their two-way subcode partition chain, are used as inner codes.(More)
We investigate the use of Gallager's low-density parity-check (LDPC) codes in a degraded broadcast channel, one of the fundamental models in network information theory. Combining linear codes is a standard technique in practical network communication schemes and is known to provide better performance than simple time sharing methods when algebraic codes are(More)
Unequal error protection (UEP) codes find applications in broadcast cbannels, as well as in otber digital communication systems, where messages bave ditTerent degrees of importance, In this correspon­ dence, binary linear UEP (LUEP) codes combined with a Gray mapped QPSK signal set are used to obtain new efficient QPSK block-modulation codes for unequal(More)
A new construction for multilevel coded modulation with multistage decoding and unequal error protection is proposed and analyzed for both symmetric and asymmetric 16-QAM constellations. It is shown that the conventional upper bound originally derived for PSK signaling is loose when applied to QAM. A new tight approximated upper bound is proposed for 16-QAM(More)
Finally, for BCH codes we get Theorem 3: Let t = o (n a) and 1 = [ (i + 1)/2], then in the BCH code of length rt = 2 " '-1 and with minimum distance 2t + 1 Abstract-We present a class of binary primitive BCH codes that have unequal-error-protection (UEP) capabilities. We use a recent result on the span of their minimum weight vectors to show that binary(More)
ilktract-In this paper, a new software defined radio plat-forim with multiport-based direct conversion is proposed, named SOPRANO (Software Programmable and Hardware Eeconfigurable Architecture for Eetwgrk). The main features of SOPRANO are a high-level design methodology for digital circuits, a new mixer-less direct conversion method, and software(More)
This paper discusses a design methodology suitable for the development of software de ned radio platforms. A exible digital receiver was designed and implemented using a multi-port direct converter and an FPGA-based platform. The design starts with a hardware-oriented top-level system model. The model is built based on basic signal processing blocks(More)
In our previous work, the k-value pseudo random sequence generated by power residue symbol has been researched. The sequence is generated by applying a primitive polynomial over odd characteristics field, trace function, and power residue symbol. And the sequence has some interesting features such as period, periodic autocorrelation, and linear complexity.(More)