Robert Morelos-Zaragoza

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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)
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)
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 mul-tistage 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)
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)
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)
— 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)
Proposition 6: Let m 2 p and j arbitrary. If all weights in c are divisible by 2p, then the degree of the set C,E3(zm) A, does not exceed 2m-2p. Pro03 If the set C1EJ(2m) A, is empty, the proposition is trivial. If A, is nonempty, then j must be divisible by 2p. Hence, the set '&(2m) S, of degree 2"-1 is contained in the set C110(2p) Sa of degree 2p-1. By(More)
— This letter considers block-coded 8-phase-shift-keying (PSK) modulations for the unequal error protection (UEP) of information transmitted over Rayleigh-fading channels. Both conventional linear block codes and linear UEP (LUEP) codes are combined with a naturally labeled 8-PSK signal set, using the multilevel construction of Imai and Hirakawa [1].(More)