Transmission latency and reliability trade-off in path-time coded cognitive radio ad hoc networks

Yi Chi Chen, I. Wei Lai, Kwang Cheng Chen, Wen Tsuen Chen, Chia Han Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Cognitive radio ad hoc network (CRAHN) is considered as a key technology to enhance the spectrum efficiency for diverse applications. However, due to the opportunistic links, the intrinsic randomness of the CRAHN makes the traditional precise control of the end-to-end transmission unscalable and generally infeasible. The recently-proposed virtual multiple-input multiple-output (MIMO) framework exploits the multipath routing to create the diversity at the network layer. With only local information and no feedback control channel, the path-time code (PTC) of the virtual MIMO system is able to efficiently provide the error resilient end-to-end transmission. In particular, while the transmission latency should be minimized, more attempts for accessing the opportunistic links can be made if a larger latency is allowed, which improves the error rate performance of the end-to-end transmission. By theoretically analyzing the error rate performance and erasure statistics, we propose a design guideline to determine the waiting period as the limit of the transmission latency. This designed waiting period not only preserves the diversity gained by the PTC but also provides a low transmission latency, resulting in a good balance of the reliability-latency trade-off of the end-to-end PTC transmission in CRAHNs.

Original languageEnglish
Title of host publication2014 IEEE Global Communications Conference, GLOBECOM 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781479935116
Publication statusPublished - 2014 Feb 9
Externally publishedYes
Event2014 IEEE Global Communications Conference, GLOBECOM 2014 - Austin, United States
Duration: 2014 Dec 82014 Dec 12

Publication series

Name2014 IEEE Global Communications Conference, GLOBECOM 2014


Conference2014 IEEE Global Communications Conference, GLOBECOM 2014
Country/TerritoryUnited States


  • Cognitive radio ad hoc networks (CRAHNs)
  • erasure channel
  • path-time code (PTC)
  • PEP analysis
  • space-time code (STC)
  • virtual multiple-input and multiple-output (MIMO)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Communication


Dive into the research topics of 'Transmission latency and reliability trade-off in path-time coded cognitive radio ad hoc networks'. Together they form a unique fingerprint.

Cite this