In recent years, iterative receiver has been widely considered since it is able to achieve high data rates and reliable communications for coded MIMO-OFDM systems. However, such a receiver is extremely challenging in ...
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ISBN:
(纸本)9781509019908
In recent years, iterative receiver has been widely considered since it is able to achieve high data rates and reliable communications for coded MIMO-OFDM systems. However, such a receiver is extremely challenging in practical implementation. In this paper, we present an efficient fixed-point arithmetic of iterative receiver based on low-complexity K-Best decoder in order to reduce the hardware costs in terms of area and execution time. The performance of fixed-point receiver is then evaluated with different modulation orders and channel models. Moreover, a testbed for MIMO-OFDM system using wireless open access research platform (WARP) is introduced in order to evaluate the performance of the receiver under real system conditions.
This paper proposes a multi-antenna spatial multiplexing receiver exhibiting very good performances in the presence of fading and low signal-to-noise ratio. These result from the use of a soft-output sphere decoder wi...
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ISBN:
(纸本)9781424443093
This paper proposes a multi-antenna spatial multiplexing receiver exhibiting very good performances in the presence of fading and low signal-to-noise ratio. These result from the use of a soft-output sphere decoder with reduced complexity and a robust turbo channel decoder affected by log-likelihood ratio quantization and saturation. Fixed-point implementation is targeted, taking in account the receiver throughput and latency.
作者：
Seethal, C. R.Yamuna, B.Amrita Univ
Amrita Vishwa Vidyapeetham Amrita Sch Engn Dept Elect & Commun Engn Coimbatore 641112 Tamil Nadu India
In this paper a log-MAP turbo decoding algorithm which incorporates reliability threshold based trellis branch elimination together with mean based early iteration termination has been proposed. The proposed algorithm...
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ISBN:
(纸本)9781509063673
In this paper a log-MAP turbo decoding algorithm which incorporates reliability threshold based trellis branch elimination together with mean based early iteration termination has been proposed. The proposed algorithm reduces computational complexity by eliminating branches in trellis. Since the minimum Log Likelihood Ratio (LLR) obtained for each iteration varies with channel conditions, an early iteration termination based on the mean of extrinsic information has been combined with branch elimination. Here, complexity mitigation is done both in terms of branch elimination and iteration reduction with negligible performance degradation. By reducing the computational complexity, decoding delay, power consumptions and error accumulation imparted by additional iterations etc can be minimized
In complex systems like 'Internet of Things'and 'Cyber Physical Systems', reliable communication is made possible by the use of error control codes like turbo codes. Such systems are vulnerable to atta...
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ISBN:
(纸本)9781450360944
In complex systems like 'Internet of Things'and 'Cyber Physical Systems', reliable communication is made possible by the use of error control codes like turbo codes. Such systems are vulnerable to attack by Trojans during the design or fabrication phases of IC manufacturing. This leads to a severe performance degradation of the entire system. This paper aims at analyzing the effect of a sign-bit-flipping Trojan on a turbo coded communication system. Simulations were carried out on a conventional iterative turbo decoder and the results point out that the Trojan affects the performance of the decoder at SNRs greater than -2 dB. This performance degradation is seen even with minimal activation of the Trojan and a finite error persists even at very high SNRs.
This letter proposes an efficient and simple stopping criterion for turbo decoding, which is derived by observing the behavior of log-likelihood ratio (LLR) values. Based on the behavior, the proposed criterion counts...
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This letter proposes an efficient and simple stopping criterion for turbo decoding, which is derived by observing the behavior of log-likelihood ratio (LLR) values. Based on the behavior, the proposed criterion counts the number of absolute LLR values less than a threshold and the number of hard decision 1's in order to complete the iterative decoding procedure. Simulation results show that the proposed approach achieves a reduced number of iterations while maintaining similar BER/FER performance to the previous criteria.
A new high-throughput turbo decoding scheme adopting double flow, sliding window and shuffled decoding is proposed. Analytical and numerical results show that the proposed scheme requires low number of clock cycles an...
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A new high-throughput turbo decoding scheme adopting double flow, sliding window and shuffled decoding is proposed. Analytical and numerical results show that the proposed scheme requires low number of clock cycles and small memory size to achieve a BER performance equivalent to those of existing schemes.
This paper presents two power-saving designs for Quadratic Polynomial Permutation (QPP) interleave address generator of which interleave length K is fixed and unfixed, respectively. These designs are based on our obse...
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This paper presents two power-saving designs for Quadratic Polynomial Permutation (QPP) interleave address generator of which interleave length K is fixed and unfixed, respectively. These designs are based on our observation that the quadratic term f(2)x(2)%K of f(x) = (f(1)x + f(2)x(2))%K, which is the QPP address generating function, has a short period and is symmetric within the period. Power consumption is reduced by 27.4% in the design with fixed-K and 5.4% in the design with unfixed-K on the average for various values of K, when compared with existing designs.
In this digital age, turbo Codes have been largely favoured in various high speed wireless communication systems standards (3GPP-LTE, WiMAX and WiFi). These codes are preferred due to their high performance that corre...
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In this digital age, turbo Codes have been largely favoured in various high speed wireless communication systems standards (3GPP-LTE, WiMAX and WiFi). These codes are preferred due to their high performance that corresponds to that of the Shannon limit. Due to the current trends in wireless communications, there has been a demand for high throughput and power efficiency leading to revolutionary research. The ASIP architecture, which is the multi-application specific instruction processor, has been extensively preferred for turbo decoders due to high-throughput and flexibility. The multi-ASIP turbo decoders are successfully brought forth by utilization of a network-on-chip (NoC) structure. This paper incorporates the study of the turbo decoding process, as well as analyzing the addressing patterns for various communication standards. To reduce the complexity of the NoC, mathematical calculation sequence and sub networking techniques are proposed. The arbitration of the network is done by lottery routing algorithm. The final results obtained from the structure proposed in this paper show a massive breakthrough compared to Network-on-chip (NoC). The results show a 50% improvement for High Speed Downlink Packet Access (HSDPA) and a breakthrough of 13% for Long Term Evolution (LTE) in throughput to area efficiency. (C) 2019 Published by Elsevier B.V.
The general idea to achieve error detection and correction is to add some extra bit to an original message, in which the receiver can use to check the flexibility of the message which has been delivered, and to recove...
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The general idea to achieve error detection and correction is to add some extra bit to an original message, in which the receiver can use to check the flexibility of the message which has been delivered, and to recover the noisy data. turbo code is one of the forward error correction method, which is able to achieve the channel capacity, with nearer Shannon limit, encoding and decoding of text and images are performed. Methods and the working have been explained in this paper. The error has also introduced and detection and correction of errors have been achieved. Transmission will be secure it can secure the information by the theft.
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