Correlative Coding Archives - GaussianWaves

Simulate matched filter system with SRRC filtering

Mathuranathan — Fri, 15 Feb 2019 07:09:27 +0000

Key focus: Let’s learn how to simulate matched filter receiver with square root raised cosine (SRRC) filter, for a pulse amplitude modulation (PAM) system. Simulation Model A basic pulse amplitude modulation (PAM) system as DSP implementation, is shown in Figure 1 by adding an upsampler (), pulse shaping function () at the transmitter and a ... Read more

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Precoding for partial response signaling schemes

Mathuranathan — Wed, 23 Jan 2019 07:33:34 +0000

Introduction to precoding Intersymbol interference (ISI) is a common problem in telecommunication systems, such as terrestrial television broadcasting, digital data communication systems, and cellular mobile communication systems. Dispersive effects in high-speed data transmission and multipath fading are the main reasons for ISI. To maximize the capacity, the transmission bandwidth must be extended to the entire ... Read more

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Partial response schemes: impulse & frequency response

Mathuranathan — Tue, 22 Jan 2019 07:40:03 +0000

Impulse response and frequency response of PR signaling schemes Consider a minimum bandwidth system in which the filter is represented as a cascaded combination of a partial response filter and a minimum bandwidth filter . Since is a brick-wall filter, the frequency response of the whole system is equivalent to frequency response of the FIR ... Read more

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Partial response (PR) signaling Model

Mathuranathan — Mon, 21 Jan 2019 06:45:21 +0000

Consider the generic baseband communication system model and its equivalent representation, shown in Figure 1, where the various blocks in the system are represented as filters. To have no ISI at the symbol sampling instants, the equivalent filter should satisfy Nyquist’s first criterion. If the system is ideal and noiseless, it can be characterized by ... Read more

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Correlative Coding – Modified Duobinary Signaling

Mathuranathan — Tue, 26 Apr 2011 06:30:00 +0000

Modified Duobinary Signaling is an extension of duobinary signaling. It has the advantage of zero PSD at low frequencies (especially at DC ) that is suitable for channels with poor DC response. It correlates two symbols that are 2T time instants apart, whereas in duobinary signaling, symbols that are 1T apart are correlated. The general ... Read more

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Correlative coding – Duobinary Signaling

Mathuranathan — Thu, 21 Apr 2011 03:01:00 +0000

The condition for zero ISI (Inter Symbol Interference) is which states that when sampling a particular symbol (at time instant nT=0), the effect of all other symbols on the current sampled symbol is zero. As discussed in the previous article, one of the practical ways to mitigate ISI is to use partial response signaling technique ... Read more

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