Title :
Unequal Error Protection Using Partially Regular LDPC Codes
Author :
Rahnavard, Nazanin ; Pishro-Nik, Hossein ; Fekri, Faramarz
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA
fDate :
3/1/2007 12:00:00 AM
Abstract :
In this paper, we propose a scheme to construct low-density parity-check (LDPC) codes that are suitable for unequal error protection (UEP). We derive density evolution (DE) formulas for the proposed unequal error protecting LDPC ensembles over the binary erasure channel (BEC). Using the DE formulas, we optimize the codes. For the finite-length cases, we compare our codes with some other LDPC codes, the time-sharing method, and a previous work on UEP using LDPC codes. Simulation results indicate the superiority of the proposed design methodology for UEP
Keywords :
binary codes; channel coding; parity check codes; binary erasure channel; density evolution formulas; low-density parity-check codes; partially regular LDPC codes; time-sharing method; unequal error protection; Bit error rate; Design methodology; Error correction codes; Optical fiber networks; Parity check codes; Payloads; Protection; Protocols; Spread spectrum communication; Time sharing computer systems; Low-density parity-check (LDPC) codes; unequal density evolution (UDE); unequal error protection (UEP);
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2007.892436
