An OFDM CDMA technique in broadband WLAN is applied to cope with interference and multipath fading and improve it s performace,and the basic approach of OFDM CDMA and A MAC protocol is discussed.

Combining the adaptive bit and power allocation with spacial diversity,an orthogonal frequency division multiplexing(OFDM) scheme is described in this paper combined with space time coded transmit diversity for frequency selected fading channel.

Orthogonal Frequency Division Multiplexing(OFDM)is a very attractive technique for high-bit-rate wireless communication in a multi-path fading environment.

A resource allocation algorithm is proposed to improve the frequency efficiency and computational efficiency of orthogonal frequency division multiplexing(OFDM) systems with low signal-to-noise ratios(SNR).

Orthogonal Frequency Division Multiplexing (OFDM) is a special multi-carrier communication system, which is extremely sensitive and vulnerable to synchronization errors.

This paper proposes a novel channel estimation method for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems.

Orthogonal Frequency Division Multiplexing (OFDM) technique has been considered as one of the cutting edge techniques in 4G mobile communication because it can combat multipath fading and achieve high data rate.

In our opinion,the simplification of base-band transmission for OFDM(orthogonal frequency division multiplexing) underwater acoustic communication is both desirable and possible.

A non-data-aided(NDA) method without the pilot signals is proposed for the residual frequency offset(RFO) in orthogonal frequency division multiplexing(OFDM) systems,by using the rotation property of OFDM signals in time domain and the phase offset in frequency domain.

An optimal post-inverse discrete Fourier transform(POST-IDFT) multidimensional beamforming is presented for space-time block coding-orthogonal frequency division multiplexing(STBC-OFDM) systems in stationary random fading channels.

This paper analyzes the encoding and detection methods in spread spectrum Code Division Multiple Access(CDMA) watermarking model,in which the trade-off relation is clearly illuminated among embedded information number,code length,detection error probability and channel capability.

The sum-rate capacity of slow fading vector broadcast channel in code division multiple access (CDMA) system and time division multiple access (TDMA) system are thoroughly researched.