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BER for BPSK in ISI channel with MMSE equalization

by Krishna Sankar on January 24, 2010

BER plot for BPSK in a 3 tap ISI channel with MMSE equalizer

In the past, we had discussed BER for BPSK in flat fading Rayleigh channel and BER for BPSK in a frequency selective channel using Zero Forcing Equalization. In this post, lets discuss a frequency selective [...]

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BER with Matched Filtering

by Krishna Sankar on May 8, 2009

Transmit spectrum for a rectangular matched filter

In the post on transmit pulse shaping filter, we had discussed pulse shaping using rectangular and sinc. In this post we will discuss about optimal receiver structure when pulse shaping is used at the transmitter. [...]

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Derivation of BPSK BER in Rayleigh channel

by Krishna Sankar on January 22, 2009

This is a guest post by Jose Antonio Urig├╝en who is an Electrical and Electronic Engineer currently studying an MSc in Communications and Signal Processing at Imperial College in London. This guest post has been [...]

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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 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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BER for BPSK in OFDM with Rayleigh multipath channel

by Krishna Sankar on August 26, 2008

BER plot for BPSK with OFDM modulation in a 10-tap Rayleigh fading channel

Mr. Lealem Tamirat, in a comment on BER for BPSK in Rayleigh channel, wondered about the performance of an OFDM modulated system in a frequency selective Rayeligh fading channel. My response was that, Though the [...]

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BER for BPSK in Rayleigh channel

by Krishna Sankar on August 10, 2008

BER plot of BPSK in Rayleigh fading channel

Long back in time we discussed the BER (bit error rate) for BPSK modulation in a simple AWGN channel (time stamps states August 2007). Almost an year back! It high time we discuss the BER [...]

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Rayleigh multipath channel model

by Krishna Sankar on July 14, 2008

Multipath channel

The article gives a quick overview of a simple statistical multipath channel model called Rayleigh fading channel model. Multipath environment In a multipath environment, it is reasonably intuitive to visualize that an impulse transmitted from [...]

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Bounds on Communication based on Shannon’s capacity

by Krishna Sankar on June 18, 2008

Spectral efficiency vs Bit to noise ratio

This is the second post in the series aimed at developing a better understanding of Shannon’s capacity equation. In this post let us discuss the bounds on communication given the signal power and bandwidth constraint. [...]

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Understanding Shannon’s capacity equation

by Krishna Sankar on June 15, 2008

Voltage levels with noise

Let us try to understand the formula for Channel Capacity with an Average Power Limitation, described in Section 25 of the landmark paper A Mathematical Theory for Communication, by Mr. Claude Shannon. Further, the following [...]

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