English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this paper, we study the achievable rate region of Gaussian multiuserchannels with the messages transmitted being from finite input alphabets andthe outputs being {\em quantized at the receiver}. In particular, we focus onthe achievable rate region of $i)$ Gaussian broadcast channel (GBC) and $ii)$Gaussian multiple access channel (GMAC). First, we study the achievable rateregion of two-user GBC when the messages to be transmitted to both the userstake values from finite signal sets and the received signal is quantized atboth the users. We refer to this channel as {\em quantized broadcast channel(QBC)}. We observe that the capacity region defined for a GBC does not carryover as such to QBC. We show that the optimal decoding scheme for GBC (i.e.,high SNR user doing successive decoding and low SNR user decoding its messagealone) is not optimal for QBC. We then propose an achievable rate region forQBC based on two different schemes. We present achievable rate region resultsfor the case of uniform quantization at the receivers. Next, we investigate theachievable rate region of two-user GMAC with finite input alphabet andquantized receiver output. We refer to this channel as {\em quantized multipleaccess channel (QMAC)}. We derive expressions for the achievable rate region ofa two-user QMAC. We show that, with finite input alphabet, the achievable rateregion with the commonly used uniform receiver quantizer has a significant losscompared to the achievable rate region without receiver quantization. Wepropose a {\em non-uniform quantizer} which has a significantly larger rateregion compared to what is achieved with a uniform quantizer in QMAC.

Achievable Rate Region of Quantized Broadcast and MAC Channels