Approximate closed-form power allocation scheme for multiple-input–multiple-output hybrid automatic repeat request protocols over Rayleigh block fading channels

2015 ◽  
Vol 9 (16) ◽  
pp. 2023-2032 ◽  
Author(s):  
Songhu Ge ◽  
Jibo Wei ◽  
Shengchun Huang ◽  
Yong Xi ◽  
Yue Ma
Keyword(s):  
Closed Form ◽  
Power Allocation ◽  
Fading Channels ◽  
Multiple Input Multiple Output ◽  
Automatic Repeat Request ◽  
Allocation Scheme ◽  
Block Fading Channels ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Hybrid Automatic Repeat Request

scholarly journals Channel capacity and performance evaluation of precoded MIMO-OFDM system with large-size constellation

2019 ◽  
Vol 9 (6) ◽  
pp. 5024
Author(s):  
Hussein A. Leftah ◽  
Huda N. Alminshid
Keyword(s):  
Fading Channels ◽  
Channel Capacity ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Input Multiple Output ◽  
Ofdm System ◽  
Large Size ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Mimo Ofdm ◽  
And Performance

<p>Multiple input-multiple output (MIMO) is a multipath diversity exploring approach which is emerged with orthogonal frequency division multiplexing (OFDM) to produce MIMO-OFDM that is widely used in wireless communications. This paper presents a discrete Hart-ley transform (DHT) precoded MIMO-OFDM system over multipath frequency-selective fading channel with large-size quadrature amplitude modulation (16-QAM, 64-QAM and 256-QAM). A mathematical models for the BER and channel capacity over mutlipath fading channels are also derived in this paper. Average Bit-error-rate (BER) and channel capacity of the presented system is considered and compared with that of the traditional MIMO-OFDM. Simulation results shows that the transmission performance and channel capacity of the proposed schemes is better than that of the traditional MIMO-OFDM without a pre-coder.</p>

MIMO DS-BPAM UWB SYSTEM WITH SRAKE RECEIVER OVER MULTIPATH FADING CHANNELS

2009 ◽  
Vol 18 (06) ◽  
pp. 1075-1080
Author(s):  
ZHIQUAN BAI ◽  
YUANQUAN XU ◽  
XIAOTONG LI ◽  
RONGKAI LI ◽  
DONGFENG YUAN ◽  
...  
Keyword(s):  
Fading Channels ◽  
Multiple Input Multiple Output ◽  
Pulse Amplitude ◽  
Multipath Fading ◽  
Block Codes ◽  
Ultra Wideband ◽  
Multipath Fading Channels ◽  
Space Time Block Codes ◽  
Multiple Input ◽  
Input Multiple Output

In this paper, we investigate the multiple input multiple output (MIMO) direct sequence bipolar pulse amplitude modulation (DS-BPAM) ultra wideband (UWB) system over indoor multipath fading channels based on the research of Alamouti space-time block codes (STBC) and DS-BPAM UWB system. Selective Rake (SRake) receiver is employed in this paper in order to deal with the multipath effects. Theoretical bit error probability of the MIMO DS-BPAM UWB system with SRake receiver is derived. Simulation results of the MIMO DS-BPAM UWB system with SRake receiver and conventional coherent receiver over multipath fading channels are provided. The results show the efficiency of the MIMO DS-BPAM UWB system with SRake receiver.

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