Beyond the Channel Capacity of BPSK Input

TL;DR

This paper introduces a novel parallel transmission method that separates signals in a transformed space, enabling higher achievable bit rates and surpassing the traditional BPSK channel capacity, with improved BER performance.

Contribution

It proposes a new signal separation technique in Hamming- to Euclidean space that theoretically exceeds BPSK channel capacity and improves bit-error-rate performance.

Findings

Achieves higher ABR than conventional BPSK.

Demonstrates BER improvement through simulations.

Theoretically surpasses BPSK channel capacity.

Abstract

The paper proposed a method that organizes a parallel transmission of two signals to be separated from each other at receiver through Hamming- to Euclidean space, where the conventional problem of achievable bit rate (ABR) is converted to that of the ABR's summation with respect to the two separated signals. Actually, the mutual information is separated accordingly into two. Since the mutual information is non-linear function of signal power in general, the separation brings a chance for achieving higher ABR. The proposed work proceeds along the above thinking and achieves higher bit-error-rate (BER) performance in comparison with BPSK as shown in the simulations. Moreover, one can find theoretically beyond of channel capacity of BPSK input.