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Patel, Sagar
- Overview of PAPR Reduction Techniques:MIMO OFDM
Authors
1 Dept. of E&C Engineering at C S Patel Institute of Technology, Changa, CHARUSAT, IN
2 Dept. of E&C Engineering at Hasmukh Goswami College of Engineering, Ahmedabad, GTU, IN
Source
Wireless Communication, Vol 8, No 2 (2016), Pagination: 59-64Abstract
Now a days in wireless data communication field subscriber needs high data rate, lower Bit Error Rate (BER) and also high power efficiency. In Multiple Input Multiple Output (MIMO) the Orthogonal Frequency Division Multiplexing (OFDM) is the best solution to full fill these all requirements. MIMO OFDM is multicarrier modulation technique. The MIMO OFDM is known for its high data rate transmission. In MIMO OFDM the Peak to Average Power Ratio (PAPR) is high which results in power in-efficiency. Low PAPR is required in the uplink because the efficiency of power amplifier is critical due to the limited battery power in a mobile phone. In this paper we study about all PAPR reduction technique. The advantage of these techniques is efficient PAPR reduction.
Keywords
MIMO:Multiple Input Multiple Output, OFDM:Orthogonal Frequency Division Multiplexing, PAPR:Peak to Average Power Ratio, SQNR:Signal to Quantization Noise Ratio, ADC:Analog to Digital Converter, DAC:Digital to Analog Converter.- Performance of 8×1 COSTBC MIMO System under Different Transmit Antenna Selection Scheme with Reduced Feedback bit
Authors
1 Dept. of E&C Engineering at C S Patel Institute of Technology, Changa, CHARUSAT, IN
2 Dept. of E&C Engineering at Hasmukh Goswami College of Engineering, Ahmedabad, GTU, IN
3 E&C Department, at C S Patel Institute of Technology, CHARUSAT, Changa, IN
Source
Wireless Communication, Vol 7, No 10 (2015), Pagination: 307-311Abstract
In this paper, the performance of Complex orthogonal space-time block codes (COSTBCs) [1] [2] [3] with transmit antenna selection (TAS) with reduced feedback bit in a Rayleigh fading channel is analyzed. Out of the total of Lt transmit antennas, scheme-I, select best 8 transmit antenna, scheme-II, select best four group of each group consist of two transmit antenna, scheme-III, select best two transmit antenna and rest of the six antenna select randomly. Scheme-I gives best compare to Scheme-II, Scheme-III. But within this all schemes, Scheme-III requires less feedback bit compare to other schemes. All three Schemes of TAS have been presented in the article.Keywords
High Complex Orthogonal Space-Time Block Codes (COSTBCs), Transmit Antenna Selection (TAS) Feedback Bit.- Over View of Interference Cancellation Techniques in MU-MIMO
Authors
1 Dept. of E&C Engineering at C S Patel Institute of Technology, Changa, CHARUSAT, IN
2 Dept. of E&C Engineering at Government Engineering College, Gandhinagar, GTU, IN
Source
Wireless Communication, Vol 7, No 10 (2015), Pagination: 312-316Abstract
In the present and future situation in wireless communication the demand is increasing of good and high quality of communication. This is possible to the use of Multi-User MIMO systems. The Multi-User MIMO system downlink channels referred to as Broadcast Channel (BC) and uplink channels referred to as Multiple Access Channel (MAC). In MU-MIMO systems are caused interference and it is cancelled out by using transmission methods for broadcast channel. There are four transmission methods: Block Diagonalization, Tomlinson-Harashima Precoding, Channel Inversion, and Dirty Paper Coding for cancelled interference. In channel inversion method, Interference due to other Signals and inter-antenna interference become cancelled out and minimize noise enhacement. In the Block Diagonalization (BD) method, only the interference from other user signals is cancelled in the process of precoding. Dirty Paper Coding (DPC) is used to cancelled Gaussian noise and interference that is known to the transmitter. Tomlinson-Harashima Precoding (THP) in Decision Feedback Equalization is to cancel the post-cursor ISI error in the transmitter side, and in the DFE past transmit symbols are known without of errors.