In this paper, we investigate the impact of outdated channel state information (CSI) on the channel capacity of an opportunistic relaying system in conjunction with adaptive transmission techniques. We derive the closed-form expressions of the channel capacity and its associated outage probability for four adaptive transmission techniques: (1) optimal rate adaptation with constant transmit power, (2) optimal transmit power and rate adaptation, (3) channel inversion with fixed rate, and (4) truncated channel inversion with fixed rate. Analytical and numerical results show the effects of outdated CSI on the capacity of the optimal power and rate adaptation and the sub-optimal channel inversion techniques. In addition, we compare the channel capacity among various adaptive transmission techniques in the presence of outdated CSI, thereby illustrating the intuitive tradeoff between the achievable capacity and implementation complexity.
|Title of host publication||IEEE Wireless Communications and Networking Conference, WCNC|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||6|
|Publication status||Published - 2014 Nov 10|
|Event||2014 IEEE Wireless Communications and Networking Conference, WCNC 2014 - Istanbul, Turkey|
Duration: 2014 Apr 6 → 2014 Apr 9
|Name||IEEE Wireless Communications and Networking Conference, WCNC|
|Other||2014 IEEE Wireless Communications and Networking Conference, WCNC 2014|
|Period||14/4/6 → 14/4/9|
Bibliographical notePublisher Copyright:
© 2014 IEEE.
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