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In this paper, the performance evaluation of an asymmetric turbo code for different codec parameters have been done. The asymmetric turbo codes performances are compared with symmetric counter part of the turbo code. With proper selection of weight configuration, the turbo code can show better results in both water fall region as well as error floor region simultaneously. So, in some cases asymmetric...
3GPP LTE requires a 100 Mbps of peak bandwidth, and the instantaneous throughput demand changes with different applications. Fixed sub-block parallel turbo decoding scheme introduces bit-error rate (BER) performance drop when the block length is short. In this paper, an LTE turbo decoder implemented on a 0.66 mm2 die in a 65 nm CMOS technology is presented. An adaptive sub-block parallel (ASP) decoding...
The operand-width specifications in fixed-point hardware implementations of turbo code decoders is an important design issue, since this governs the trade-off between the decoder's performance and its complexity, cost, area and energy consumption. The investigation of this issue would be extremely time-consuming in the conventional approach, which relies upon Monte-Carlo simulation based Bit Error...
In this paper, we describe the concatenation of Turbo/Convolutional codes with transmit and receive diversity schemes by using Space-Time Block Code. It is shown that, by using two transmit antennas and one/or two receive antenna, large coding gain for the bit error rate is achieved over the system without diversity. Simulation results show that, by using systems with transmit and receive diversity,...
Low-density parity-check (LDPC) codes have been demonstrated to perform very close to the Shannon limit when decoded iteratively. However challenges persist in building practical high-throughput decoders due to the existence of error floors at low error rate levels. We apply high-throughput hardware emulation to capture errors and error-inducing noise realizations, which allow for in-depth analysis...
Adopting Forward Error Correction (FEC), technologies for the laser communication system such as encode, interleaving, decode have been discussed in detail in the system. TURBO code is applied in this system which can reduce the system BER effectively. We make a detailed analysis of principle and performance of encoder, interleaver and decoder. Meanwhile, we compare their performance and computational...
In this contribution we propose the novel serial concatenation of Irregular Variable Length Coding (IrVLC) and Irregular Unity Rate Coding (IrURC), where we matched the corresponding Extrinsic Information Transfer (EXIT) functions to each other. This approach facilitates a higher degree of design freedom than matching the EXIT function of an irregular codec to that of a regular codec. As a result,...
Iterative decoding of an irregular variable-length coding (IrVLC) scheme concatenated with precoded fast frequency-hopping (FFH) M-ary frequency-shift keying (MFSK) is considered. We employ extrinsic information transfer (EXIT) charts to investigate the three-stage concatenation of the FFH-MFSK demodulator, the rate-1 decoder, and the outer IrVLC decoder. The proposed joint source and channel coding...
This paper presents two algorithms to extend the MIMO-decoding capability of successive projection algorithm (SPA). The algorithms, called Flag-SPA and Relaxed-SPA, are based on different methods to avoid repeating the selected path in each iteration of the algorithm, the first by using a flag matrix, the second by assigning a high weight to a selected path. Equivalences with K-best algorithm in terms...
The provision of broadband satellite services depends on the utilisation of efficient and reliable radio interface, which has the ability to adapt to variable propagation channel conditions. In order to use the available spectrum more efficiently and to maximise the link reliability this paper presents the analysis of possible utilisation of LDPC decoder parameters to improve the performance of the...
Unequal error protection is the key to future transport of multimedia data. The paper presents an overview of some new approaches realizing UEP properties in physical transport, especially multicarrier modulation, or with LDPC and turbo codes. For multicarrier modulation, a UEP bit-loading method is described allowing for an arbitrary number of classes, arbitrary SNR margins between the classes and...
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