The tag has no wiki summary.

learn more… | top users | synonyms

7
votes
2answers
2k views

Can we break the Shannon capacity?

I have a friend working in wireless communications research. He told me that we can transmit more than one symbol in a given slot using one frequency (of course we can decode them at the receiver). ...
3
votes
2answers
118 views

Meaning of channel capacity in the AWGN channel

I understand the concept of channel capacity as the maximal rate of the channel code I can apply without making a mistake in the receiver, in that sense the capacity is between 0 and 1. What I don't ...
0
votes
1answer
55 views

Limitations of Arithmetic coding?

I have been working on an assignment for university in which I have to compress an 80K message consisting of only two symbols, 'a' and 'b', having probability values of 0.6 and 0.4. I have ...
0
votes
0answers
24 views

throughput for MIMO

I want to calculate the throughput for a system contains two transmitting and one receiving antenna. I knew that throughput in normal cases can be calculated as $T=(1-BER)R_b$ where $R_b$ is the data ...
3
votes
1answer
67 views

Does any error correction code still work in such situation?

I'm looking for a kind of error correction code or solution that can correct my codeword in this case: My message holds k bits, and 2*k bits codeword (rate is 1/2) is produced by the generator ...
3
votes
3answers
252 views

Optimal DC-free line encoding

I have a block of n bits that I'd like to encode into m bits that have an equal number of zeros and ones. I looked at protocols like 8b/10b but it wastes 25% of the data to achieve balance. As an ...
2
votes
1answer
346 views

increase of encoding rate increases bandwidth?

I came across this paragraph in an article about signal processing. Addition of redundant bits for improving the error probability leads to bandwidth expansion of the transmitted signal by an amount ...
3
votes
1answer
328 views

Hamming code exercise

I'm preparing for my exams I stumbled across this exercise. Now I can't seem to figure it out. Anybody can help me ? The exercise: For the 8bit data word: 00111001 the check bits are: 0111. Now if ...