Throughput of DS-CDMA Wireless Packet Access with Frequency-domain Equalization and Random TPC
نویسندگان
چکیده
あらまし 筆者らはこれまで,強制的に受信電力ゆらぎを与えるランダム送信電力制御(TPC)を Rake 合成を用い る直接拡散符号分割多重(DS-CDMA)無線パケットアクセスに適用すればキャプチャ効果によりリンク容量を増大 できること,ランダム TPC にパス間干渉(IPI)キャンセルを組み合わせればスループットを更に向上できること,を 明らかにしてきた.最近,IPI を大幅に抑圧する技術として周波数領域等化(FDE)が注目されている.そこで本論文 では,FDE とランダム TPC を併用する DS-CDMA 無線パケットアクセスの受信信号電力対雑音+干渉電力比(SINR) の数式表現を導出し,それを用いてシステムスループットを数値計算により求めている.さらに,Rake 合成を適用 したときと FDE を適用したときのシステムスループットを比較し,FDE による IPI の抑圧効果を明らかにしている.
منابع مشابه
HARQ throughput performance of DS-CDMA frequency-domain equalization with ICI cancellation
Abstract In direct sequence code division multiple access (DS-CDMA), frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion and inter-chip interference (ICI) cancellation can be applied to exploit the channel frequency-selectivity and therefore, can replace the conventional rake combining while offering a much improved bit error rate (BER) performance. In the ne...
متن کاملDS-CDMA HARQ with Overlap FDE
Turbo coded hybrid ARQ (HARQ) is known as one of the promising error control techniques for high speed wireless packet access. However, in a severe frequency-selective fading channel, the HARQ throughput performance significantly degrades for direct sequence code division multiple access (DS-CDMA) system using rake combining. This problem can be overcome by replacing the rake combining by the f...
متن کاملFrequency-domain Equalization for Block Cdma Transmission
Frequency-domain equalization (FDE) technique may play an important role for broadband packet transmission using MCand DS-CDMA. The downlink performance is significantly improved with FDE; however, the uplink performance is limited by the multi-access interference (MAI). To remove the MAI while gaining the frequency diversity effect through the use of FDE, frequency-domain block spread CDMA can...
متن کاملThroughput performance of HARQ using multicode DS-CDMA with MMSE turbo equalization
Abstract In the next generation wireless communication systems, high-speed packet services will be in great demand, and hence error control technique is indispensable. Hybrid automatic repeat request (HARQ) is a well-known important error controlling technique. Joint FDE and inter-chip interference (ICI) cancellation based on the minimum mean square error (MMSE) criterion can achieve frequency ...
متن کاملThroughput Comparison of Turbo-Coded HARQ in OFDM, MC-CDMA and DS-CDMA with Frequency-Domain Equalization
OFDM, MC-CDMA and DS-CDMA are being researched vigorously as the prospective signaling technique for the next generation mobile communications systems, which will be characterized by the broadband packet technology. With packet transmissions, hybrid ARQ (HARQ) will be inevitable for error control. HARQ with rate compatible punctured turbo (RCPT) codes is one of the promising techniques. Data ra...
متن کامل