Discrete Adaptation Of Turbo Punctured Codes For Hybrid-ARQ
نویسندگان
چکیده
The paper presents a process for assigning modulation and code rate in DS-CDMA for downlink throughput maximization. The system employed consists of a turbo encoder with PSK and QAM modulation with adaptation for slow-fading channels. The performance of the adaptation process is examined for 2-state, 4-state and 6-state sets of transmit parameters. The performance of the optimization process is verified through computer simulation. Index Terms Hybrid-ARQ, AMC, adaptive, fading, diversity combining and turbo codes.
منابع مشابه
A Partial IR Hybrid ARQ Scheme Using Rate-Compatible Punctured LDPC Codes in an HSDPA System
In this paper, an efficient partial incremental redundancy (P-IR) scheme is proposed for an H-ARQ using block type low density parity check (B-LDPC) codes. The performance of the proposed P-IR scheme is evaluated in an HSDPA system using IEEE 802.16e B-LDPC codes. Simulation results show that the proposed H-ARQ using IEEE 802.16e BLDPC codes outperforms the H-ARQ using 3GPP turbo codes. key wor...
متن کاملAdaptation of Turbo Punctured Codes for Hybrid-ARQ
The paper presents an iterative process of the selection of modulation and code rate in order to achieve performance close to the maximum supportable data rate of a given channel. The code rate and modulation choosing process is employed for the design of packet based hybrid-automatic repeat request (hybrid-ARQ) schemes in direct sequence code division multiple access (DS-CDMA) systems. We cons...
متن کاملRate Compatible Punctured Turbo-Coded Hybrid ARQ for OFDM in a Frequency Selective Fading Channel
Recently orthogonal frequency division multiplexing (OFDM) has gained a lot of attention in mobile radio communications because of its ability to allow high data rate transmission in a severe frequency selective fading channel. Rate compatible punctured turbo coded hybrid ARQ (RCPT HARQ) has been found to give improved throughput performance in a DS-CDMA system. However the extent to which the ...
متن کاملImproved regular and semi-random rate-compatible low-density parity-check codes with short block lengths
Powerful rate-compatible codes are essential for achieving high throughput in hybrid automatic repeat request (ARQ) systems for networks utilising packet data transmission. The paper focuses on the construction of efficient rate-compatible low-density parity-check (RC-LDPC) codes over a wide range of rates. Two LDPC code families are considered; namely, regular LDPC codes which are known for go...
متن کاملAnalysis of the optimum spreading factor for MC-CDMA with RCPT-coded HARQ
In MC-CDMA, each user’s data-modulated symbol to be transmitted is spread over a number of subcarriers using an orthogonal spreading sequence defined in the frequency-domain. As the spreading factor SF becomes larger, the transmission performance improves due to increasing frequency diversity effect; however, the data rate per user decreases. The SF=1 system corresponds to an OFDM system. In an...
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 2003