Pre-compensation techniques can be used to enhance the bit error rate (BER) performance of time division duplex (TDD) orthogonal frequency division multiplexing (OFDM) communication links. With pre-compensation at the transmitter, the power assigned to each subcarrier is varied according to the channel state information (CSI). This paper derives a pre-compensation algorithm for OFDM systems that use coherent quadrature phase shift keying (QPSK) modulation on each subcarrier. The algorithm attempts to minimize the received BER subject to a constraint on the transmitted signal power. In order to yield a closed-form solution, the minimization is based on an approximation of the BER function, and is sub-optimal. The performance of the algorithm is compared with the fully optimal solution. In addition, the possible exploitation of the technique within a wireless local area network (WLAN) is discussed.
|Translated title of the contribution||A constrained approach to pre-compensation for TDD OFDM systems|
|Title of host publication||53rd IEEE Vehicular Technology Conference|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||648 - 652|
|Number of pages||5|
|Publication status||Published - May 2001|
|Event||53rd Vehicular Technology Conference 2001 (VTC 2001-Spring) - Rhodes, Greece|
Duration: 1 May 2001 → …
|Conference||53rd Vehicular Technology Conference 2001 (VTC 2001-Spring)|
|Period||1/05/01 → …|
Bibliographical noteRose publication type: Conference contribution
Sponsorship: The financial support of Blue Wave Systems inc. and thc Engineering and Physical Sciences Research Council is gratefully acknowledged.
By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
- OFDM modulation
- wireless LAN