MIMO

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Six equalizers for V-BLAST

by Krishna Sankar on April 21, 2009

ber_plot_2transmit_2receive_mimo_with_bpsk_in_rayleigh_channel

In the past, we had discussed several posts on two transmit two receive MIMO communication, where the transmission was based on V-BLAST. The details about V-BLAST can be read from the landmark paper V-BLAST: An [...]

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Transmit beamforming

by Krishna Sankar on April 13, 2009

ber_plot_2transmit_1receive_transmit_beamforming_with_bpsk_in_rayleigh_channel

In this post lets discuss a closed-loop transmit diversity scheme, where the transmitter has the knowledge of the channel. As there is a feedback path required from the receiver, to communicate the channel seen by [...]

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Alamouti STBC with 2 receive antenna

by Krishna Sankar on March 15, 2009

2transmit_2receive_alamouti_stbc

In the past, we had discussed two transmit, one receive antenna Alamouti Space Time Block Coding (STBC) scheme. In this post, lets us discuss the impact of having two antennas at the receiver. For the [...]

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MIMO with ML equalization

by Krishna Sankar on December 14, 2008

BER plot 2x2 MIMO Rayleigh channel with Maximum Likelihood equalisation

We have discussed quite a few receiver structures for a 2×2 MIMO channel namely, (a) Zero Forcing (ZF) equalization (b) Minimum Mean Square Error (MMSE) equalization (c) Zero Forcing equalization with Successive Interference Cancellation (ZF-SIC) [...]

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MIMO with MMSE SIC and optimal ordering

by Krishna Sankar on December 6, 2008

2x2 MIMO MMSE-SIC equalization

This post attempts to build further on the MIMO equalization schemes which we have discussed – (a) Minimum Mean Square Error (MMSE) equalization, (b) Zero Forcing equalization with Successive Interference Cancellation (ZF-SIC) and (c) ZF-SIC [...]

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MIMO with ZF SIC and optimal ordering

by Krishna Sankar on November 29, 2008

2x2 MIMO equalized by ZF-SIC with optimal ordering

In previous posts, we had discussed equalization of a 2×2 MIMO channel with Zero Forcing (ZF) equalization and later, Zero Forcing equalization with successive interference cancellation (ZF-SIC). In this post, we will explore a variant [...]

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MIMO with Zero Forcing Successive Interference Cancellation equalizer

by Krishna Sankar on November 9, 2008

BER plot for BPSK in 2x2 MIMO channel with Zero Forcing Successive Interference Cancellation equalization

The post on MIMO with Zero Forcing equalizer discussed a probable way of equalizing a 2×2 MIMO channel. The simulated results with the 2×2 MIMO system with zero forcing equalizer showed matching results as obtained [...]

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MIMO with MMSE equalizer

by Krishna Sankar on November 2, 2008

BER plot for 2x2 MIMO with MMSE equalization for BPSK in Rayleigh channel

In a previous post, we had discussed a 2×2 MIMO transmission using BPSK modulation in Rayleigh channel with a Zero Forcing equalizer. The simulated results with the 2×2 MIMO system  with zero forcing equalizer showed [...]

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MIMO with Zero Forcing equalizer

by Krishna Sankar on October 24, 2008

BER plot for 2x2 MIMO channel with ZF receiver (BPSK modulation in Rayleigh channel)

We had discussed three Single Input Multiple Output (SIMO also known as receive diversity) schemes – Selection combining, Equal Gain Combining, Maximal Ratio Combining and a Multiple Input Single Output (MISO, also known as transmit [...]

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Alamouti STBC

by Krishna Sankar on October 16, 2008

2Transmit, 1Receive Alamouti STBC coding

In the recent past, we have discussed three receive diversity schemes – Selection combining, Equal Gain Combining and Maximal Ratio Combining. All the three approaches used the antenna array at the receiver to improve the [...]

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Maximal Ratio Combining (MRC)

by Krishna Sankar on September 28, 2008

Plot of Effective SNR with Maximal Ratio Combining in Rayleigh fading channel

This is the third post in the series discussing receiver diversity in a wireless link. Receiver diversity is a form of space diversity, where there are multiple antennas at the receiver. The presence of receiver [...]

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Equal Gain Combining (EGC)

by Krishna Sankar on September 19, 2008

Gain in Eb/N0 with equal gain combining

This is the second post in the series discussing receiver diversity in a wireless link. Receiver diversity is a form of space diversity, where there are multiple antennas at the receiver. The presence of receiver [...]

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Selection Diversity

by Krishna Sankar on September 6, 2008

Receive Diversity

This is the first post in the series discussing receiver diversity in a wireless link. Receiver diversity is a form of space diversity, where there are multiple antennas at the receiver. The presence of receiver [...]

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Receive diversity in AWGN

by Krishna Sankar on August 19, 2008

BER BPSK AWGN Receive diversity

Some among you will be aware that in a wireless link having multiple antenna’s at the receiver (aka receive diversity) improves the bit error rate (BER) performance. In this post, let us try to understand [...]

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