From 99321f3347cb6599b68a029bdeac17eecb3731bf Mon Sep 17 00:00:00 2001
From: Erik Strand <erik.strand@cba.mit.edu>
Date: Thu, 9 May 2019 12:53:46 -0400
Subject: [PATCH] Maybe answer 15.4 (c)
---
_psets/12.md | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/_psets/12.md b/_psets/12.md
index 6869f16..ca92e61 100644
--- a/_psets/12.md
+++ b/_psets/12.md
@@ -162,6 +162,7 @@ If an op-amp with a gain–bandwidth product of 10 MHz and an open-loop DC gain
configured as an inverting amplifier, plot the magnitude and phase of the gain as a function of
frequency as $$R_\text{out}/R_\text{in}$$ is varied.
+
## (15.3)
{:.question}
@@ -205,6 +206,13 @@ $$
Assuming a flat noise power spectrum, what is the coding gain if the entire sequence is used to send
one bit?
+I think the coding gain works out like the SNR I derive in the next problem... but could be wrong.
+
+$$
+10 \log_{10} \left( 2^{88.5} \right) = 266 \si{dB}
+$$
+
+
## (15.5)
{:.question}
@@ -291,6 +299,7 @@ $$
The message 00 10 01 11 00 ($$c_1$$, $$c_2$$) was received from a noisy channel. If it was sent by
the convolutional encoder in Figure 15.20, what data were transmitted?
+
## (15.7)
{:.question}
--
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