Interference mitigation in uplink STBC MC-CDMA system based on PIC receiver
01 Nov 2017-Radioelectronics and Communications Systems (Pleiades Publishing)-Vol. 60, Iss: 11, pp 485-494
TL;DR: STBC is introduced at the transmitter to improve the quality of the receiver for MC-CDMA system and it is observed that the proposed receiver outperforms STBC-Orthogonal Complete Complementary Code (STBC-OCCC), ST BC-Minimum Mean Square Error (ST BC-MMSE) and STBC/ZF receivers for MAI reduction.
Abstract: Multi Carrier Code Division Multiple Access (MC-CDMA) is attractive technique for high speed data transmission in multipath fading channel. MC-CDMA system cannot handle the sudden time variations of the channel which cause the subcarriers to lose their orthogonality. The loss of orthogonality between the subcarriers of a user or unwanted correlation between the spreading codes of different user can lead to increase in Multiple Access Interference (MAI). Space Time Block Code (STBC) based MC-CDMA system is chosen to achieve full diversity and transmission rate without the knowledge of Channel State Information (CSI) at the transmitter. Thus, in the paper STBC is introduced at the transmitter to improve the quality of the receiver. Space Time Block Code-Parallel Interference Cancellation (STBC-PIC) receiver has been proposed for MC-CDMA system. In the proposed STBC-PIC receiver, at each interference cancellation stage, weighted signal of the other user is subtracted from signal of the desired user, thereby reducing the MAI and improving the BER performance. From the simulation results, it is observed that the proposed receiver outperforms STBC-Orthogonal Complete Complementary Code (STBC-OCCC), STBC-Minimum Mean Square Error (STBC-MMSE) and STBC-Zero Forcing (STBC-ZF) receivers for MAI reduction.
Citations
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TL;DR: An iterative parallel decision feedback (P-DF) receivers associated with parallel interference cancellation (PIC) for multicarrier code division multiple access (MC-CDMA) systems in a Rayleigh fading channel is proposed.
Abstract: In this paper we propose an iterative parallel decision feedback (P-DF) receivers associated with parallel interference cancellation (PIC) for multicarrier code division multiple access (MC-CDMA) systems in a Rayleigh fading channel (cost 207). First the most widely detection techniques, minimum mean-squared error MMSE, Maximum Likelihood ML and PIC were investigated in order to compare their performances in terms of Bit Error Rate (BER) with parallel feedback detection P-DFD. A MMSE DF detector that employs parallel decision-feedback (MMSE-P-DFD) is considered and shows almost the same BER performance with MMSE and ML, which present a better result than the other techniques. In a second time, an iterative proposed method based on the multi-stage techniques P-DFD (parallel DFD with two stages) and PIC was exploited to improve the performance of the system.
1 citations
Cites methods from "Interference mitigation in uplink S..."
...For an uplink communication in cellular network, iterative receivers with parallel interference cancellers (PIC) detectors or Successive interference cancellers (SIC) detectors are adopted in [4, 12, 13]....
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01 Sep 2020TL;DR: This paper has proposed the hybrid receiver for MC-CDMA by combining threshold based parallel interference cancellation (TPIC) scheme and minimum mean square error based parallel interfered cancellation (IPIC).
Abstract: In fading channel mode, multi carrier code division multiple access (MC-CDMA) is facing many challenges like phase distortion, random amplitudes and high error probability. The interferences like multiple access interference (MAD disturbs the capacity and performance of MC-CDMA. To overcome these issues, this paper has proposed the hybrid receiver for MC-CDMA by combining threshold based parallel interference cancellation (TPIC) scheme and minimum mean square error based parallel interference cancellation. The TPIC uses decision statistic magnitude and threshold function to remove the MAI from the received signal. The performance of the Hybrid-PIC scheme is compared with two different conditions. It is observed that the HPIC outperforms the Improved-PIC (IPIC) with 2dB at 1E-3 of BER.
Cites background from "Interference mitigation in uplink S..."
...In [5-8], the author’s proposed different soft decision based interference cancellation mechanisms....
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TL;DR: Transceiver structures with switched interleaving, linear precoding, and detectors for both uplink and downlink using limited-feedback techniques are developed and simulation results show that the performance of the proposed techniques is significantly better than prior art.
Abstract: In this paper, we propose transmit processing techniques based on novel switched interleaving, chipwise linear precoding, and limited feedback for both downlink and uplink multicarrier code-division multiple access (MC-CDMA) multiple-antenna systems. We develop transceiver structures with switched interleaving, linear precoding, and detectors for both uplink and downlink using limited-feedback techniques. In the proposed schemes, a set of possible chip interleavers is constructed and prestored at both the base station (BS) and mobile stations (MSs). For the downlink, a new hybrid transmit processing technique based on switched interleaving and chipwise precoding is proposed to suppress the multiuser interference. The BS and MSs are also equipped with another codebook of quantized downlink channel-state information (CSI). Each MS quantizes its own downlink CSI and feeds the index back to the BS through a low-rate feedback channel. Then, the selection function at the BS determines the optimum interleaver based on the CSI of all users. Moreover, a transmit processing technique for the uplink of multiple-antenna MC-CDMA systems, which requires a very low rate of feedback information, is also proposed. Codebook design methods for both interleavers and quantized CSI are also proposed. Simulation results show that the performance of the proposed techniques is significantly better than prior art.
50 citations
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49 citations