High Data Rate Transmission Scheme with Adaptive Spread Factor chip loading in OFCDM System

초록

Utilizing multiple subcarriers with low symbol rate, OFCDM can reduce the interference of multiple path. Also, OFCDM possesses usefulness of CDMA, which has various data rate service, and can be expanded to IMT-2000. However, in multiple cell environment, OFCDM distributes scramble code for each cell in frequency domain, thus had limitations in securing the reuse of frequency and also lacked efficient cell deployment due to the necessity of frequency reuse in a multi-cell enviroment without a complicated dynamic channel assignment. So, This paper proposes a new chip loading method applying Adaptive Modulation, which can raise the effectiveness of reusing frequency in multi-cell environment by securing the high data transmission rate without any bandwidth expansion or increase in transmission power. Keyword: OFDM, OFCDM, Adaptive Modulation