Search for dissertations about: "long spreading codes"

Found 3 swedish dissertations containing the words long spreading codes.

  2. 1. Synchronization and data detection in long-code CDMA systems / Pei Xiao %C Göteborg

    Author : Pei Xiao; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; iterative demodulation; Rayleigh-fading channels; acquisition; tracking; long spreading codes; multiuser detector; additive white Gaussian noise AWGN ; short spreading codes; data detection; synchronization; channel estimation; direct sequence code division multiple access DS-CDMA ; orthogonal modulation; delay estimator; multiple access interference MAI ;

    Abstract : .... READ MORE

  4. 2. Low-density parity-check codes : unequal error protection and reduction of clipping effects

    Author : Sara Sandberg; David Declercq; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Signal Processing;

    Abstract : The invention of low-density parity-check (LDPC) codes made reliable communication possible at transmission rates very close to the theoretical limit predicted by Shannon. However, communication close to the Shannon limit requires very long codes and results in long delay and high encoder and decoder complexity. READ MORE

  5. 3. Channel Coding and Multiuser Detection for CDMA and Wireless Communications

    Author : Pål Orten; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rate compatible punctured convolutional RCPC codes; optimum distance spectrum ODS ; low-rate convolutional codes; interference cancellation; code-division multiple-access CDMA ; sequential decoding; automatic repeat request ARQ ; multiuser detection; maximum free distance MFD ; nested convolutional codes; tailbiting; rate matching;

    Abstract : Next generation wireless communication systems will require support for many different applications as well as improved quality compared to existing second generation systems like GSM (Global System for Mobile communications). Since there will be more users and higher data rates, the capacity must also be increased. READ MORE